Linux udev 动态管理Oracle ASM磁盘-实验

发布时间：2020-08-10 20:37:03 作者：SmartWilson
来源：ITPUB博客阅读：212

1 概述

在Red Hat Enterprise Linux (RHEL) 6以前，Oracle都是采用ASMLib包来管理ASM磁盘。但是2011年5月甲骨文发表了一份声明，声明中称Oracle将不再提供Red Hat Enterprise Linux (RHEL) 6的ASMLib包和相关更新。

甲骨文在这份声明中表示，ASMLib更新将通过Unbreakable Linux Network（ULN）来发布，并仅对Oracle Linux客户开放。ULN虽然为甲骨文和红帽的客户服务，但如果客户想要使用ASMLib，就必须使用Oracle的kernel来替换掉红帽的kernel。

本实验部署Oracle+ASM，不再采用ASMLib，而是采用udev动态管理ASM磁盘。

注意：Linux 内核 2.6以上才支持udev。

虚拟机：VMware Workstation 9

操作系统：Red Hat Enterprise Linux Server release 5.6

系统内核：2.6.18-238.el5

数据库：Oracle Database 11.2.0.1

2 实验步骤

之前已经基于udev的方式创建过ASM磁盘，而且已经安装好Oracle Grid 、Oracle Database，并创建好了数据库，接下来将添加4块1G磁盘，分别扩展现有ASM磁盘组DG_DATA，新建ASM磁盘组DG_NEW_DATA。

查看新添加的磁盘，分别为/dev/sdb、/dev/sdg、/dev/sdh、/dev/sdi。

[root@ora32 dev]# fdisk -l

Disk /dev/sda: 23.6 GB, 23622320128 bytes

255 heads, 63 sectors/track, 2871 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 1 65 522081 83 Linux

/dev/sda2 66 457 3148740 82 Linux swap / Solaris

/dev/sda3 458 2871 19390455 8e Linux LVM

Disk /dev/sdb: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/sdc: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdc1 1 261 2096451 83 Linux

Disk /dev/sdd: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdd1 1 261 2096451 83 Linux

Disk /dev/sde: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sde1 1 261 2096451 83 Linux

Disk /dev/sdf: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdf1 1 261 2096451 83 Linux

Disk /dev/sdg: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdg doesn't contain a valid partition table

Disk /dev/sdh: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdh doesn't contain a valid partition table

Disk /dev/sdi: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdi doesn't contain a valid partition table

分别对4块磁盘进行分区，每块磁盘分1个区即可。

[root@ora32 dev]# fdisk -l

Disk /dev/sda: 23.6 GB, 23622320128 bytes

255 heads, 63 sectors/track, 2871 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 1 65 522081 83 Linux

/dev/sda2 66 457 3148740 82 Linux swap / Solaris

/dev/sda3 458 2871 19390455 8e Linux LVM

Disk /dev/sdb: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdb1 1 130 1044193+ 83 Linux

Disk /dev/sdc: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdc1 1 261 2096451 83 Linux

Disk /dev/sdd: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdd1 1 261 2096451 83 Linux

Disk /dev/sde: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sde1 1 261 2096451 83 Linux

Disk /dev/sdf: 2147 MB, 2147483648 bytes

255 heads, 63 sectors/track, 261 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdf1 1 261 2096451 83 Linux

Disk /dev/sdg: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdg1 1 130 1044193+ 83 Linux

Disk /dev/sdh: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdh2 1 130 1044193+ 83 Linux

Disk /dev/sdi: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdi1 1 130 1044193+ 83 Linux

现在需要通过udev来管理这几个磁盘设备文件，通过规则文件将磁盘映射为固定名称，并赋予所属用户，用户组，操作权限等。

查看udev规则文件

[root@ora32 dev]# cd /etc/udev/rules.d

[root@ora32 rules.d]# ll

total 248

-rw-r--r-- 1 root root 515 Nov 25 2010 05-udev-early.rules

-rw-r--r-- 1 root root 948 Dec 8 2010 40-multipath.rules

-rw-r--r-- 1 root root 16153 Nov 25 2010 50-udev.rules

-rw-r--r-- 1 root root 163 Dec 11 2010 51-dlm.rules

-rw-r--r-- 1 root root 471 Nov 25 2010 51-hotplug.rules

-rw-r--r-- 1 root root 138 May 10 17:28 55-usm.rules

-rw-r--r-- 1 root root 58016 Oct 13 2006 60-libsane.rules

-rw-r--r-- 1 root root 143 Oct 13 2010 60-net.rules

-rw-r--r-- 1 root root 1088 Jul 18 2006 60-pcmcia.rules

-rw-r--r-- 1 root root 316 Sep 22 2010 60-raw.rules

-rw-r--r-- 1 root root 9175 Nov 13 2010 60-wacom.rules

-rw-r--r-- 1 root root 129 Nov 30 2010 61-uinput-stddev.rules

-rw-r--r-- 1 root root 214 Nov 30 2010 61-uinput-wacom.rules

-rw-r--r-- 1 root root 1823 Sep 19 2008 85-pcscd_ccid.rules

-rw-r--r-- 1 root root 114 Aug 29 2008 90-alsa.rules

-rw-r--r-- 1 root root 61 Nov 25 2010 90-dm.rules

-rw-r--r-- 1 root root 82 Nov 4 2010 90-hal.rules

-rw-r--r-- 1 root root 107 Nov 25 2010 95-pam-console.rules

-rw-r--r-- 1 root root 292 Nov 30 2010 98-kexec.rules

-rw-r--r-- 1 root root 669 May 13 13:51 99-oracle-asmdevices.rules

-rw-r--r-- 1 root root 60 Sep 16 2012 99-oracle.rules

-rw-r--r-- 1 root root 334 Sep 15 2012 99-vmware-scsi-udev.rules

-rw-r--r-- 1 root root 2319 Jul 9 2008 bluetooth.rules

udev规则文件“99-oracle-asmdevices.rules”之前已经创建好，看一下当前的映射规则和ASM磁盘情况。

[root@ora32 rules.d]# cat 99-oracle-asmdevices.rules

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29c9a269653c7cd04ea2edb0c71", NAME="ASM_DISK_2G_1", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29861258ebc95eded634a1f36fd", NAME="ASM_DISK_2G_2", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c296fd09d9ed213df1999820ca89", NAME="ASM_DISK_2G_3", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c2934ae12fd4af0dd366d85b42f5", NAME="ASM_DISK_2G_4", WNER="grid", GROUP="asmadmin", MODE="0660"

规则解释，以第一条为例。

系统启动时，udev根据系统总线scsi（BUS=="scsi"）和内核设备文件名sd?1（KERNEL=="sd?1"），过滤出需要动态映射的设备，然后再利用/sbin/scsi_id（PROGRAM=="/sbin/scsi_id"）命令输出的SCSI磁盘id，输出结果中匹配上"36000c29c9a269653c7cd04ea2edb0c71"的SCSI磁盘，则会应用后续的命名、授权等操作（NAME="ASM_DISK_2G_1", WNER="grid", GROUP="asmadmin", MODE="0660"），SCSI磁盘ID可以通过/sbin/scsi_id命令获取。

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sdc/sdc1

36000c29c9a269653c7cd04ea2edb0c71

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sdd/sdd1

36000c29861258ebc95eded634a1f36fd

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sde/sde1

36000c296fd09d9ed213df1999820ca89

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sdf/sdf1

36000c2934ae12fd4af0dd366d85b42f5

从上述结果可以看出，udev已经做了如下映射关系。

/block/sdc/sdc1 => ASM_DISK_2G_1

/block/sdd/sdd1 => ASM_DISK_2G_2

/block/sde/sde1 => ASM_DISK_2G_3

/block/sdf/sdf1 => ASM_DISK_2G_4

[grid@ora32 dev]$ ll ASM*

brw-rw---- 1 grid asmadmin 8, 33 May 13 14:57 ASM_DISK_2G_1

brw-rw---- 1 grid asmadmin 8, 49 May 13 14:57 ASM_DISK_2G_2

brw-rw---- 1 grid asmadmin 8, 65 May 13 14:54 ASM_DISK_2G_3

brw-rw---- 1 grid asmadmin 8, 81 May 13 14:57 ASM_DISK_2G_4

通过Oracle视图看一下当前磁盘组、磁盘的使用情况。

[grid@ora32 ~]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.1.0 Production on Mon May 13 14:54:01 2013

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Automatic Storage Management option

SQL>

SQL> col name for a10

SQL> SELECT group_number,name,type,state,total_mb,free_mb,offline_disks FROM V$ASM_diskgroup;

GROUP_NUMBER NAME TYPE STATE TOTAL_MB FREE_MB OFFLINE_DISKS

------------ ---------- ------ ----------- ---------- ---------- -------------

1 DG_DATA EXTERN MOUNTED 8188 6448 0

SQL> col group# for 99

SQL> col disk# for 99

SQL> col name for a5

SQL> col path for a11

SQL> col LABEL for a7

SQL> col FAILGROUP for a10

SQL> select GROUP_NUMBER group#,DISK_NUMBER disk#,LABEL,STATE,FAILGROUP,name,path,TOTAL_MB,FREE_MB from v$asm_disk;

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

1 2 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1612

02 TA_00 SK_2G_3

1 3 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1611

03 TA_00 SK_2G_4

1 1 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1613

01 TA_00 SK_2G_2

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

1 0 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1612

00 TA_00 SK_2G_1

现将新增的4块硬盘通过udev映射为需要的设备文件，然后将其中2块增加到ASM磁盘组DG_DATA中，另外2块则新建一个ASM磁盘组DG_NEW_DATA。

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sdb/sdb1

36000c2968513d97eb7cdd25bdbd10600

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sdg/sdg1

36000c29682ba5ec7a4c8a189499a89bb

[root@ora32 rules.d]# /sbin/scsi_id -g -s /block/sdh/sdh2

36000c292aa4a4ebbb25d15d2084c01ca

[root@ora32 rules.d]# /sbin/scsi_id -g -s /blokc/sdi/sdi1

新增设备映射规则

[root@ora32 rules.d]# vi 99-oracle-asmdevices.rules

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29c9a269653c7cd04ea2edb0c71", NAME="ASM_DISK_2G_1", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29861258ebc95eded634a1f36fd", NAME="ASM_DISK_2G_2", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c296fd09d9ed213df1999820ca89", NAME="ASM_DISK_2G_3", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c2934ae12fd4af0dd366d85b42f5", NAME="ASM_DISK_2G_4", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c2968513d97eb7cdd25bdbd10600", NAME="ASM_DISK_1G_1", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29682ba5ec7a4c8a189499a89bb", NAME="ASM_DISK_1G_2", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c292aa4a4ebbb25d15d2084c01ca", NAME="ASM_DISK_1G_3", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29a98ca1bd8a0012e99f992a19d", NAME="ASM_DISK_1G_4", WNER="grid", GROUP="asmadmin", MODE="0660"

如果是第一次配置udev映射关系，需要如下操作。

1、在目录/etc/udev/rules.d/中新建99-oracle-asmdevices.rules文件。

2、配置SCSI 设备为可信任设备，配置/etc/scsi_id.config文件，添加options=-g配置项。

[root@ora32 rules.d]# cat /etc/scsi_id.config

# scsi_id configuration

# lower or upper case has no affect on the left side. Quotes (") are

# required for spaces in values. Model is the same as the SCSI

# INQUIRY product identification field. Per the SCSI INQUIRY, the vendor

# is limited to 8 bytes, model to 16 bytes.

# The first matching line found is used. Short matches match longer ones,

# if you do not want such a match space fill the extra bytes. If no model

# is specified, only the vendor string need match.

# ptions=<any scsi_id command line options>

# vendor=string[,model=string],options=<per-device scsi_id options>

# some libata drives require vpd page 0x80

vendor="ATA",options=-p 0x80

options=-g

测试udev能否正确映射

[root@ora32 ~]# testudev /block/sdg/sdg1

-bash: testudev: command not found

[root@ora32 ~]# udevtest /block/sdb/sdb1

main: looking at device '/block/sdb/sdb1' from subsystem 'block'

udev_rules_get_name: add symlink 'disk/by-id/scsi-36000c2968513d97eb7cdd25bdbd10600-part1'

udev_rules_get_name: add symlink 'disk/by-path/pci-0000:00:10.0-scsi-0:0:1:0-part1'

run_program: '/lib/udev/vol_id --export /dev/.tmp-8-17'

run_program: '/lib/udev/vol_id' returned with status 4

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

udev_rules_get_name: rule applied, 'sdb1' becomes 'ASM_DISK_1G_1'

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c2968513d97eb7cdd25bdbd10600'

run_program: '/sbin/scsi_id' returned with status 0

udev_device_event: device '/block/sdb/sdb1' already in database, validate currently present symlinks

udev_node_add: creating device node '/dev/ASM_DISK_1G_1', major = '8', minor = '17', mode = '0660', uid = '503', gid = '504'

udev_node_add: creating symlink '/dev/disk/by-id/scsi-36000c2968513d97eb7cdd25bdbd10600-part1' to '../../ASM_DISK_1G_1'

udev_node_add: creating symlink '/dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:1:0-part1' to '../../ASM_DISK_1G_1'

main: run: 'socket:/org/kernel/udev/monitor'

main: run: '/lib/udev/udev_run_devd'

main: run: 'socket:/org/freedesktop/hal/udev_event'

main: run: '/sbin/pam_console_apply /dev/ASM_DISK_1G_1 /dev/disk/by-id/scsi-36000c2968513d97eb7cdd25bdbd10600-part1 /dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:1:0-part1'

main: run: '/bin/sh -c 'echo 180 >/sys/block/sdb/sdb1/timeout''

[root@ora32 ~]# udevtest /block/sdg/sdg1

main: looking at device '/block/sdg/sdg1' from subsystem 'block'

udev_rules_get_name: add symlink 'disk/by-id/scsi-36000c29682ba5ec7a4c8a189499a89bb-part1'

udev_rules_get_name: add symlink 'disk/by-path/pci-0000:00:10.0-scsi-0:0:6:0-part1'

run_program: '/lib/udev/vol_id --export /dev/.tmp-8-97'

run_program: '/lib/udev/vol_id' returned with status 4

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

udev_rules_get_name: rule applied, 'sdg1' becomes 'ASM_DISK_1G_2'

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29682ba5ec7a4c8a189499a89bb'

run_program: '/sbin/scsi_id' returned with status 0

udev_device_event: device '/block/sdg/sdg1' already in database, validate currently present symlinks

udev_node_add: creating device node '/dev/ASM_DISK_1G_2', major = '8', minor = '97', mode = '0660', uid = '503', gid = '504'

udev_node_add: creating symlink '/dev/disk/by-id/scsi-36000c29682ba5ec7a4c8a189499a89bb-part1' to '../../ASM_DISK_1G_2'

udev_node_add: creating symlink '/dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:6:0-part1' to '../../ASM_DISK_1G_2'

main: run: 'socket:/org/kernel/udev/monitor'

main: run: '/lib/udev/udev_run_devd'

main: run: 'socket:/org/freedesktop/hal/udev_event'

main: run: '/sbin/pam_console_apply /dev/ASM_DISK_1G_2 /dev/disk/by-id/scsi-36000c29682ba5ec7a4c8a189499a89bb-part1 /dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:6:0-part1'

main: run: '/bin/sh -c 'echo 180 >/sys/block/sdg/sdg1/timeout''

[root@ora32 ~]# udevtest /block/sdh/sdh2

main: looking at device '/block/sdh/sdh2' from subsystem 'block'

udev_rules_get_name: add symlink 'disk/by-id/scsi-36000c292aa4a4ebbb25d15d2084c01ca-part1'

udev_rules_get_name: add symlink 'disk/by-path/pci-0000:00:10.0-scsi-0:0:8:0-part1'

run_program: '/lib/udev/vol_id --export /dev/.tmp-8-113'

run_program: '/lib/udev/vol_id' returned with status 4

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

udev_rules_get_name: rule applied, 'sdh2' becomes 'ASM_DISK_1G_3'

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c292aa4a4ebbb25d15d2084c01ca'

run_program: '/sbin/scsi_id' returned with status 0

udev_device_event: device '/block/sdh/sdh2' already in database, validate currently present symlinks

udev_node_add: creating device node '/dev/ASM_DISK_1G_3', major = '8', minor = '113', mode = '0660', uid = '503', gid = '504'

udev_node_add: creating symlink '/dev/disk/by-id/scsi-36000c292aa4a4ebbb25d15d2084c01ca-part1' to '../../ASM_DISK_1G_3'

udev_node_add: creating symlink '/dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:8:0-part1' to '../../ASM_DISK_1G_3'

main: run: 'socket:/org/kernel/udev/monitor'

main: run: '/lib/udev/udev_run_devd'

main: run: 'socket:/org/freedesktop/hal/udev_event'

main: run: '/sbin/pam_console_apply /dev/ASM_DISK_1G_3 /dev/disk/by-id/scsi-36000c292aa4a4ebbb25d15d2084c01ca-part1 /dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:8:0-part1'

main: run: '/bin/sh -c 'echo 180 >/sys/block/sdh/sdh2/timeout''

[root@ora32 ~]# udevtest /block/sdi/sdi1

main: looking at device '/block/sdi/sdi1' from subsystem 'block'

udev_rules_get_name: add symlink 'disk/by-id/scsi-36000c29a98ca1bd8a0012e99f992a19d-part1'

udev_rules_get_name: add symlink 'disk/by-path/pci-0000:00:10.0-scsi-0:0:9:0-part1'

run_program: '/lib/udev/vol_id --export /dev/.tmp-8-129'

run_program: '/lib/udev/vol_id' returned with status 4

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

run_program: '/sbin/scsi_id'

run_program: '/sbin/scsi_id' (stdout) '36000c29a98ca1bd8a0012e99f992a19d'

run_program: '/sbin/scsi_id' returned with status 0

udev_rules_get_name: rule applied, 'sdi1' becomes 'ASM_DISK_1G_4'

udev_device_event: device '/block/sdi/sdi1' already in database, validate currently present symlinks

udev_node_add: creating device node '/dev/ASM_DISK_1G_4', major = '8', minor = '129', mode = '0660', uid = '503', gid = '504'

udev_node_add: creating symlink '/dev/disk/by-id/scsi-36000c29a98ca1bd8a0012e99f992a19d-part1' to '../../ASM_DISK_1G_4'

udev_node_add: creating symlink '/dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:9:0-part1' to '../../ASM_DISK_1G_4'

main: run: 'socket:/org/kernel/udev/monitor'

main: run: '/lib/udev/udev_run_devd'

main: run: 'socket:/org/freedesktop/hal/udev_event'

main: run: '/sbin/pam_console_apply /dev/ASM_DISK_1G_4 /dev/disk/by-id/scsi-36000c29a98ca1bd8a0012e99f992a19d-part1 /dev/disk/by-path/pci-0000:00:10.0-scsi-0:0:9:0-part1'

main: run: '/bin/sh -c 'echo 180 >/sys/block/sdi/sdi1/timeout''

重新启动udev服务

[root@ora32 ~]# /sbin/udevcontrol reload_rules

[root@ora32 ~]# /sbin/start_udev

Starting udev: [ OK ]

查看一下新映射的磁盘

[root@ora32 ~]# ll /dev/ASM*

brw-rw---- 1 grid asmadmin 8, 17 May 13 15:40 /dev/ASM_DISK_1G_1

brw-rw---- 1 grid asmadmin 8, 97 May 13 15:40 /dev/ASM_DISK_1G_2

brw-rw---- 1 grid asmadmin 8, 113 May 13 15:40 /dev/ASM_DISK_1G_3

brw-rw---- 1 grid asmadmin 8, 129 May 13 15:40 /dev/ASM_DISK_1G_4

brw-rw---- 1 grid asmadmin 8, 33 May 13 15:43 /dev/ASM_DISK_2G_1

brw-rw---- 1 grid asmadmin 8, 49 May 13 15:43 /dev/ASM_DISK_2G_2

brw-rw---- 1 grid asmadmin 8, 65 May 13 15:42 /dev/ASM_DISK_2G_3

brw-rw---- 1 grid asmadmin 8, 81 May 13 15:43 /dev/ASM_DISK_2G_4

通过Oracle视图查看一下ASM磁盘情况

[grid@ora32 ~]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.1.0 Production on Mon May 13 15:42:05 2013

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production

With the Automatic Storage Management option

SQL>

SQL> col group# for 99

SQL> col disk# for 99

SQL> col name for a5

SQL> col path for a11

SQL> col LABEL for a7

SQL> col FAILGROUP for a10

SQL> select GROUP_NUMBER group#,DISK_NUMBER disk#,LABEL,STATE,FAILGROUP,name,path,TOTAL_MB,FREE_MB from v$asm_disk;

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

0 0 NORMAL /dev/ASM_DI 0 0

SK_1G_3

0 1 NORMAL /dev/ASM_DI 0 0

SK_1G_2

0 2 NORMAL /dev/ASM_DI 0 0

SK_1G_1

0 3 NORMAL /dev/ASM_DI 0 0

SK_1G_4

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

1 2 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1612

02 TA_00 SK_2G_3

1 3 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1611

03 TA_00 SK_2G_4

1 1 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1613

01 TA_00 SK_2G_2

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

1 0 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1612

00 TA_00 SK_2G_1

8 rows selected.

此时发现新添加的4块硬盘，已经可以通过视图进行查询，但是FAILGROUP、NAME等属性为空，因为磁盘还没有加到ASM磁盘组。ASM是怎么认到新增加的磁盘？其实它是根据参数文件中的属性asm_diskstring自动扫描到的，这个参数是在安装GRID同时配置ASM时设置的。

SQL> show parameter ASM

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

asm_diskgroups string

asm_diskstring string /dev/ASM*

asm_power_limit integer 1

asm_preferred_read_failure_groups string

将磁盘ASM_DISK_1G_1、ASM_DISK_1G_2添加到磁盘组DG_DATA中。

SQL> ALTER DISKGROUP DG_DATA ADD disk '/dev/ASM_DISK_1G_1';

Diskgroup altered.

SQL> ALTER DISKGROUP DG_DATA ADD disk '/dev/ASM_DISK_1G_2';

Diskgroup altered.

新建磁盘组DG_NEW_DATA，将ASM_DISK_1G_3、ASM_DISK_1G_4添加到磁盘组中。

SQL> CREATE DISKGROUP DG_NEW_DATA external REDUNDANCY DISK '/dev/ASM_DISK_1G_3','/dev/ASM_DISK_1G_4';

Diskgroup created.

通过Oracle 视图查看一下新增ASM磁盘组、ASM磁盘的情况

SQL> col name for a10

SQL> SELECT group_number,name,type,state,total_mb,free_mb,offline_disks FROM V$ASM_diskgroup;

GROUP_NUMBER NAME TYPE STATE TOTAL_MB FREE_MB OFFLINE_DISKS

------------ ---------- ------ ----------- ---------- ---------- -------------

1 DG_DATA EXTERN MOUNTED 10226 8482 0

2 DG_NEW_DAT EXTERN MOUNTED 2038 1986 0

SQL> select GROUP_NUMBER group#,DISK_NUMBER disk#,LABEL,STATE,FAILGROUP,name,path,TOTAL_MB,FREE_MB from v$asm_disk;

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB

---------- ----- ------- -------- ---------- ----- ----------- ----------

FREE_MB

----------

1 2 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047

02 TA_00 SK_2G_3

1697

1 3 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047

03 TA_00 SK_2G_4

1697

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB

---------- ----- ------- -------- ---------- ----- ----------- ----------

FREE_MB

----------

1 1 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047

01 TA_00 SK_2G_2

1699

1 0 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047

00 TA_00 SK_2G_1

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB

---------- ----- ------- -------- ---------- ----- ----------- ----------

FREE_MB

----------

1697

2 0 NORMAL DG_NEW_DAT DG_NE /dev/ASM_DI 1019

A_0000 W_DAT SK_1G_3

A_000

994

1 5 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 1019

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB

---------- ----- ------- -------- ---------- ----- ----------- ----------

FREE_MB

----------

05 TA_00 SK_1G_2

846

1 4 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 1019

04 TA_00 SK_1G_1

846

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB

---------- ----- ------- -------- ---------- ----- ----------- ----------

FREE_MB

----------

2 1 NORMAL DG_NEW_DAT DG_NE /dev/ASM_DI 1019

A_0001 W_DAT SK_1G_4

A_000

992

8 rows selected.

根据实验要求4块硬盘添加完毕，接下来将硬盘ASM_DISK_1G_1、ASM_DISK_1G_2从ASM磁盘组DG_DATA中删除，然后将udev映射规则删除。

SQL> ALTER DISKGROUP DG_DATA DROP DISK DG_DATA_0004;

Diskgroup altered.

SQL> ALTER DISKGROUP DG_DATA DROP DISK DG_DATA_0005;

Diskgroup altered.

SQL> col group# for 99

SQL> col disk# for 99

SQL> col name for a5

SQL> col path for a11

SQL> col LABEL for a7

SQL> col FAILGROUP for a10

SQL> select GROUP_NUMBER group#,DISK_NUMBER disk#,LABEL,STATE,FAILGROUP,name,path,TOTAL_MB,FREE_MB from v$asm_disk;

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

0 0 NORMAL /dev/ASM_DI 0 0

SK_1G_2

0 1 NORMAL /dev/ASM_DI 0 0

SK_1G_1

1 2 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1612

02 TA_00 SK_2G_3

1 3 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1611

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

03 TA_00 SK_2G_4

1 1 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1614

01 TA_00 SK_2G_2

1 0 NORMAL DG_DATA_00 DG_DA /dev/ASM_DI 2047 1611

00 TA_00 SK_2G_1

GROUP# DISK# LABEL STATE FAILGROUP NAME PATH TOTAL_MB FREE_MB

------ ----- ------- -------- ---------- ----- ----------- ---------- ----------

2 0 NORMAL DG_NEW_DAT DG_NE /dev/ASM_DI 1019 994

A_0000 W_DAT SK_1G_3

A_000

2 1 NORMAL DG_NEW_DAT DG_NE /dev/ASM_DI 1019 992

A_0001 W_DAT SK_1G_4

A_000

8 rows selected.

[root@ora32 ~]# vi /etc/udev/rules.d/99-oracle-asmdevices.rules

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29c9a269653c7cd04ea2edb0c71", NAME="ASM_DISK_2G_1", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29861258ebc95eded634a1f36fd", NAME="ASM_DISK_2G_2", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c296fd09d9ed213df1999820ca89", NAME="ASM_DISK_2G_3", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c2934ae12fd4af0dd366d85b42f5", NAME="ASM_DISK_2G_4", WNER="grid", GROUP="asmadmin", MODE="0660"

#KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

#RESULT=="36000c2968513d97eb7cdd25bdbd10600", NAME="ASM_DISK_1G_1", WNER="grid", GROUP="asmadmin", MODE="0660"

#KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

#RESULT=="36000c29682ba5ec7a4c8a189499a89bb", NAME="ASM_DISK_1G_2", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c292aa4a4ebbb25d15d2084c01ca", NAME="ASM_DISK_1G_3", WNER="grid", GROUP="asmadmin", MODE="0660"

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id",

RESULT=="36000c29a98ca1bd8a0012e99f992a19d", NAME="ASM_DISK_1G_4", WNER="grid", GROUP="asmadmin", MODE="0660"

重新启动udev

[root@ora32 dev]# /sbin/udevcontrol reload_rules

[root@ora32 dev]# /sbin/start_udev

Starting udev: [ OK ]

查看一下dev下的设备，发现仍然存在/dev/ASM_DISK_1G_1，/dev/ASM_DISK_1G_2

[root@ora32 dev]# ll /dev/ASM*

brw-rw---- 1 grid asmadmin 8, 17 May 13 16:15 /dev/ASM_DISK_1G_1

brw-rw---- 1 grid asmadmin 8, 97 May 13 16:15 /dev/ASM_DISK_1G_2

brw-rw---- 1 grid asmadmin 8, 113 May 13 16:38 /dev/ASM_DISK_1G_3

brw-rw---- 1 grid asmadmin 8, 129 May 13 16:37 /dev/ASM_DISK_1G_4

brw-rw---- 1 grid asmadmin 8, 33 May 13 16:38 /dev/ASM_DISK_2G_1

brw-rw---- 1 grid asmadmin 8, 49 May 13 16:38 /dev/ASM_DISK_2G_2

brw-rw---- 1 grid asmadmin 8, 65 May 13 16:38 /dev/ASM_DISK_2G_3

brw-rw---- 1 grid asmadmin 8, 81 May 13 16:37 /dev/ASM_DISK_2G_4

不知道是何原因。将数据库实例和ASM实例都停掉后，重新启动udev服务后发现dev下仍然存在/dev/ASM_DISK_1G_1，/dev/ASM_DISK_1G_2，通过udevinfo查询发现已经在udev不存在记录。

[root@ora32 dev]# udevinfo -q path -n /dev/ASM_DISK_1G_1

no record for 'ASM_DISK_1G_1' in database

[root@ora32 dev]# udevinfo -q path -n /dev/ASM_DISK_1G_2

no record for 'ASM_DISK_1G_2' in database

[root@ora32 dev]#

[root@ora32 dev]# udevinfo -q path -n /dev/ASM_DISK_1G_3

/block/sdh/sdh2

在网上查阅了资料，并未找到解决/dev/ASM_DISK_1G_1，/dev/ASM_DISK_1G_2为什么仍然存在的原因，继续跟踪这个问题。

Linux udev 动态管理Oracle ASM磁盘-实验

1 概述

2 实验步骤

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