測試一體機ASM Disk online操作
阿新 • • 發佈：2018-12-02
環境：3臺虛擬機器 RHEL 7.3 + Oracle RAC 11.2.0.4
問題現象：RAC執行正常，ASM磁碟組Normal冗餘，節點主機重啟，offline狀態的asm disk短時間內可以直接online。
在《測試一體機ASM failgroup的相關問題處理》之前的文章，描述了重新新增磁碟的場景，其實如果故障發現及時（預設3.6h內），是可以直接online對應磁碟的，這時候現象類似如下：
SQL> select group_number, disk_number, name, path, failgroup, mode_status, voting_file from v$asm_disk order by 1, 2; GROUP_NUMBER DISK_NUMBER NAME PATH FAILGROUP MODE_STATUS VO ------------ ----------- ------------------------------ ----------------------------------- ------------------------------ -------------- -- 0 0 /dev/CELL01-data2 ONLINE N 0 1 /dev/CELL01-data1 ONLINE N 0 2 /dev/CELL01-crs1 ONLINE Y 1 0 CRS_0000 CRS_0000 OFFLINE N 1 1 CRS_0001 /dev/CELL02-crs2 CRS_0001 ONLINE Y 1 2 CRS_0002 /dev/CELL03-crs3 CRS_0002 ONLINE Y 2 0 DATA_0000 /dev/CELL03-data1 CELL03 ONLINE N 2 1 DATA_0001 /dev/CELL03-data2 CELL03 ONLINE N 2 2 DATA_0002 /dev/CELL02-data1 CELL02 ONLINE N 2 3 DATA_0003 /dev/CELL02-data2 CELL02 ONLINE N 2 4 DATA_0004 CELL01 OFFLINE N 2 5 DATA_0005 CELL01 OFFLINE N 12 rows selected.
這種情況就可以直接online對應磁碟:
SQL> alter diskgroup CRS online disk CRS_0000; Diskgroup altered. SQL> alter diskgroup DATA online disk DATA_0004,DATA_0005; alter diskgroup DATA online disk DATA_0004,DATA_0005 * ERROR at line 1: ORA-15032: not all alterations performed ORA-15282: ASM disk "DATA_0005" is not visible cluster-wide ORA-15282: ASM disk "DATA_0004" is not visible cluster-wide
直接online對應磁碟如果遇到上面這個報錯，因為有其他節點沒有看到要online的磁碟，檢查其他節點：
[[email protected] ~]# ls -l /dev/CELL* lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL01-crs1 -> sdc lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL02-crs2 -> sdi lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL02-data1 -> sdj lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL02-data2 -> sdk lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL03-crs3 -> sdd lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL03-data1 -> sdf lrwxrwxrwx 1 root root 3 Dec 2 21:16 /dev/CELL03-data2 -> sdh
此時先要確認lsscsi底層正常（如果不正常先解決iscsi層的問題，我這裡是正常的）：
[[email protected] ~]# lsscsi
[1:0:0:0] cd/dvd VBOX CD-ROM 1.0 /dev/sr0
[2:0:0:0] disk ATA VBOX HARDDISK 1.0 /dev/sda
[3:0:0:0] disk ATA VBOX HARDDISK 1.0 /dev/sdb
[4:0:0:0] disk LIO-ORG disk1 4.0 /dev/sdc
[4:0:0:1] disk LIO-ORG disk2 4.0 /dev/sde
[4:0:0:2] disk LIO-ORG disk3 4.0 /dev/sdg
[5:0:0:0] disk LIO-ORG disk1 4.0 /dev/sdd
[5:0:0:1] disk LIO-ORG disk2 4.0 /dev/sdf
[5:0:0:2] disk LIO-ORG disk3 4.0 /dev/sdh
[6:0:0:0] disk LIO-ORG disk1 4.0 /dev/sdi
[6:0:0:1] disk LIO-ORG disk2 4.0 /dev/sdj
[6:0:0:2] disk LIO-ORG disk3 4.0 /dev/sdk 重新重新整理udev規則，確認所有磁碟識別正確：
[[email protected] ~]# udevadm control --reload
[[email protected] ~]# udevadm trigger
[[email protected] ~]# ls -l /dev/CELL*
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL01-crs1 -> sdc
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL01-data1 -> sde
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL01-data2 -> sdg
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL02-crs2 -> sdi
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL02-data1 -> sdj
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL02-data2 -> sdk
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL03-crs3 -> sdd
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL03-data1 -> sdf
lrwxrwxrwx 1 root root 3 Dec 2 21:18 /dev/CELL03-data2 -> sdh然後再次進行online磁碟成功：
SQL> alter diskgroup DATA online disk DATA_0004,DATA_0005;
Diskgroup altered.這種可以直接online disk的情況就免去了ASM磁碟組rebalance的大量時間，所以這類問題發現後最好要及時聯絡工程師進行處理。