客戶一套RAC環境是華為的存儲，共享盤是/dev/sd*，咋一看還懷疑是沒有進行多路徑配置，實際和主機工程師是已經配置好的，我們使用upadmin show vlun命令可以查看到：
[root@xxdb01 ~]# upadmin show vlun
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Vlun ID Disk Name Lun WWN Status Capacity Ctrl(Own/Work) Array Name Dev Lun ID No. of Paths(Available/Total)
0 sdb LUN_Oracle_400G_0000 6acb3b510041191b0de7bcdd0000000f Normal 400.00GB 0D/0D Huawei.18500V5 15 8/8
1 sdc LUN_Oracle_400G_0001 6acb3b510041191b0de7be3900000010 Normal 400.00GB 0A/0A Huawei.18500V5 16 8/8
2 sdd LUN_Oracle_400G_0002 6acb3b510041191b0de7bec100000011 Normal 400.00GB 0B/0B Huawei.18500V5 17 8/8
3 sde LUN_Oracle_400G_0003 6acb3b510041191b0de7bfc900000012 Normal 400.00GB 0C/0C Huawei.18500V5 18 8/8
4 sdf LUN_Oracle_400G_0004 6acb3b510041191b0de7c03f00000013 Normal 400.00GB 0D/0D Huawei.18500V5 19 8/8
5 sdg LUN_Oracle_400G_0005 6acb3b510041191b0de7c09e00000014 Normal 400.00GB 0A/0A Huawei.18500V5 20 8/8
6 sdh LUN_Oracle_400G_0006 6acb3b510041191b0de7c0e900000015 Normal 400.00GB 0B/0B Huawei.18500V5 21 8/8
7 sdi LUN_Oracle_400G_0007 6acb3b510041191b0de7c12e00000016 Normal 400.00GB 0C/0C Huawei.18500V5 22 8/8
8 sdj LUN_Oracle_5G_0003 6acb3b510041191b0de893a0000000da Normal 5.00GB 0C/0C Huawei.18500V5 218 8/8
9 sdk LUN_Oracle_5G_0004 6acb3b510041191b0de8941e000000db Normal 5.00GB 0D/0D Huawei.18500V5 219 8/8
10 sdl LUN_Oracle_5G_0005 6acb3b510041191b0de894a4000000dc Normal 5.00GB 0A/0A Huawei.18500V5 220 8/8
11 sdm LUN_Oracle_100G_0002 6acb3b510041191b0de80f1f00000039 Normal 100.00GB 0B/0B Huawei.18500V5 57 8/8
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[root@xxdb01 ~]#
實際上直接使用這些盤也是可以的，但是考慮到規范，參考之前客戶udev綁定規則規范：
--not available
KERNEL=="sd*",BUS=="scsi",PROGRAM=="/sbin/scsi_id i --whitelisted --device=/dev/$name",RESULT=="36000c29b263ed2452f80e9848bdf2fa5",NAME="asm-2g-2fa5-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
可以看到別名的命名方式是：asm-lunsize-id后四位-磁盤組名+編號。這樣以后遇到加盤/刪盤這類操作，就能快速幫助DBA確認。
不過因為上面這個udev語法是RHEL 6的，在CentOS 7並不適用，換成7對應的語法就是：
--ok!
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bcdd0000000f",SYMLINK+="asm-400g-000f-data1",OWNER="grid",GROUP="asmadmin",MODE="0660"
考慮到盤相對多，一個個寫既費時又容易出錯，想起早些年間裝RAC時，經常會參考maclean的一個方法，就是把這個工作寫一個腳本：
vi /u01/asmdisk.sh
for i in b c d e f g h i j k l m;
do
echo "KERNEL==\"sd*\",SUBSYSTEM==\"block\",PROGRAM==\"/lib/udev/scsi_id -g -u -d /dev/\$name\",RESULT==\"`/lib/udev/scsi_id -g -u -d /dev/sd$i`\",SYMLINK+=\"asm-5g-xxxx-grid1\",OWNER=\"grid\",GROUP=\"asmadmin\",MODE=\"0660\""
done
執行腳本：sh /u01/asmdisk.sh ，結果為：
--script-result
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bcdd0000000f",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7be3900000010",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bec100000011",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bfc900000012",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c03f00000013",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c09e00000014",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c0e900000015",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c12e00000016",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de893a0000000da",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de8941e000000db",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de894a4000000dc",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de80f1f00000039",SYMLINK+="asm-5g-xxxx-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
使用帶列編輯的文本編輯器快速修改如下，然后復制到/etc/udev/rules.d/99-oracle-asmdevices.rules配置文件中：
--modify
[root@xxdb01 ~]# cat /etc/udev/rules.d/99-oracle-asmdevices.rules
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bcdd0000000f",SYMLINK+="asm-400g-000f-data1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7be3900000010",SYMLINK+="asm-400g-0010-data2",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bec100000011",SYMLINK+="asm-400g-0011-data3",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7bfc900000012",SYMLINK+="asm-400g-0012-data4",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c03f00000013",SYMLINK+="asm-400g-0013-data5",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c09e00000014",SYMLINK+="asm-400g-0014-data6",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c0e900000015",SYMLINK+="asm-400g-0015-data7",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de7c12e00000016",SYMLINK+="asm-400g-0016-data8",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de893a0000000da",SYMLINK+="asm-5g-00da-grid1",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de8941e000000db",SYMLINK+="asm-5g-00db-grid2",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de894a4000000dc",SYMLINK+="asm-5g-00dc-grid3",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="sd*",SUBSYSTEM=="block",PROGRAM=="/lib/udev/scsi_id -g -u -d /dev/$name",RESULT=="36acb3b510041191b0de80f1f00000039",SYMLINK+="asm-100g-0039-arch1",OWNER="grid",GROUP="asmadmin",MODE="0660"
這里看到這個/lib/udev/scsi_id -g -u -d /dev/sd*查到的結果和存儲多路徑查到的Lun WWN，除了scsi_id查詢的結果首位多一個3，后面是完全一樣的。
此時可以使用udevadm進行應用規則：
udevadm control --reload
udevadm trigger
然后查看結果：
[root@xxdb01 ~]# ls -l /dev/asm*
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-100g-0039-arch1 -> sdm
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-000f-data1 -> sdb
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0010-data2 -> sdc
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0011-data3 -> sdd
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0012-data4 -> sde
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0013-data5 -> sdf
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0014-data6 -> sdg
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0015-data7 -> sdh
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-400g-0016-data8 -> sdi
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-5g-00da-grid1 -> sdj
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-5g-00db-grid2 -> sdk
lrwxrwxrwx. 1 root root 3 Sep 8 10:19 /dev/asm-5g-00dc-grid3 -> sdl
[root@xxdb01 ~]# ls -l /dev/sd*
brw-rw----. 1 root disk 8, 0 Sep 8 10:10 /dev/sda
brw-rw----. 1 root disk 8, 1 Sep 8 10:10 /dev/sda1
brw-rw----. 1 root disk 8, 2 Sep 8 10:10 /dev/sda2
brw-rw----. 1 grid asmadmin 8, 16 Sep 8 16:02 /dev/sdb
brw-rw----. 1 grid asmadmin 8, 32 Sep 8 10:19 /dev/sdc
brw-rw----. 1 grid asmadmin 8, 48 Sep 8 10:19 /dev/sdd
brw-rw----. 1 grid asmadmin 8, 64 Sep 8 10:19 /dev/sde
brw-rw----. 1 grid asmadmin 8, 80 Sep 8 10:19 /dev/sdf
brw-rw----. 1 grid asmadmin 8, 96 Sep 8 10:19 /dev/sdg
brw-rw----. 1 grid asmadmin 8, 112 Sep 8 10:19 /dev/sdh
brw-rw----. 1 grid asmadmin 8, 128 Sep 8 10:19 /dev/sdi
brw-rw----. 1 grid asmadmin 8, 144 Sep 8 16:02 /dev/sdj
brw-rw----. 1 grid asmadmin 8, 160 Sep 8 16:02 /dev/sdk
brw-rw----. 1 grid asmadmin 8, 176 Sep 8 16:02 /dev/sdl
brw-rw----. 1 grid asmadmin 8, 192 Sep 8 16:02 /dev/sdm
最終使用asmca創建磁盤組，最終結果為：
[grid@xxdb01 ~]$ asmcmd lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 512 4096 4194304 102400 102276 0 102276 0 N ARCH/
MOUNTED EXTERN N 512 4096 4194304 3276800 3276620 0 3276620 0 N DATA/
MOUNTED NORMAL N 512 4096 4194304 15360 14320 5120 4600 0 Y GRID/
[grid@xxdb01 ~]$
可以看到，磁盤組的名字和上面定義的磁盤別名，可以很好的進行管理維護，個人認為這個客戶的規范很值得借鑒。