阿里云ORACLE RAC共享磁盤組ASM擴容實戰(zhàn)筆記

一、問題需求

某項目一套RAC共享ASM磁盤組空間不足，導致無法完成歸檔，數(shù)據(jù)庫無法正常使用。下面分享一下其過程。

二、過程

2.1 新購共享塊存儲并掛載

1
、阿里云上新購共享塊存儲并掛載到兩rac節(jié)點上

2 、登陸到兩rac節(jié)點查看是否掛載成功

用如下命令查看磁盤是否成功掛載到rac節(jié)點

fdisk -l

2.2 新建ASM磁盤

1
、對新磁盤進行分區(qū)操作

[root@stage ~]# fdisk /dev/sdeDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0x185ef87e.Changes will remain in memory only, until you decide to write them.After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) WARNING: DOS-compatible mode is deprecated. It's strongly recommended to         switch off the mode (command 'c') and change display units to         sectors (command 'u'). Command (m for help): nCommand action   e   extended   p   primary partition (1-4)pPartition number (1-4): 1First cylinder (1-8192, default 1):Using default value 1Last cylinder, +cylinders or +size{ K,M,G} (1-8192, default 8192):Using default value 8192 Command (m for help): wThe partition table has been altered! Calling ioctl() to re-read partition table.Syncing disks. [root@stage ~]#  partprobe /dev/sde [root@stage ~]#  fdisk -lDisk /dev/sdc: 1073 MB, 1073741824 bytes34 heads, 61 sectors/track, 1011 cylindersUnits = cylinders of 2074 * 512 = 1061888 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x6dab55b0    Device Boot      Start         End      Blocks   Id  System/dev/sdc1               1        1011     1048376+  83  Linux Disk /dev/sdd: 6442 MB, 6442450944 bytes199 heads, 62 sectors/track, 1019 cylindersUnits = cylinders of 12338 * 512 = 6317056 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x9904376c    Device Boot      Start         End      Blocks   Id  System/dev/sdd1               1        1019     6286180   83  Linux Disk /dev/mapper/VolGroup00-root: 24.2 GB, 24201134080 bytes255 heads, 63 sectors/track, 2942 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000  Disk /dev/mapper/VolGroup00-swap: 2113 MB, 2113929216 bytes255 heads, 63 sectors/track, 257 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000 Disk /dev/sde: 8589 MB, 8589934592 bytes64 heads, 32 sectors/track, 8192 cylindersUnits = cylinders of 2048 * 512 = 1048576 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x185ef87e    Device Boot      Start         End      Blocks   Id  System/dev/sde1               1        8192     8388592   83  Linux

2、查詢磁盤組的資源使用情況

通常我們關注FREE_MB字段

SQL>SELECT GROUP_NUMBER,NAME,SECTOR_SIZE,BLOCK_SIZE,ALLOCATION_UNIT_SIZE,STATE,TYPE TOTAL_MB,FREE_MB FROM V$ASM_DISKGROUP;

3、創(chuàng)建asm磁盤

[root@oracle1 ~]# /etc/init.d/oracleasm createdisk DATA_0001 /dev/sde1Marking disk "DATA_0001" as an ASM disk:                   [  OK  ][root@oracle1 ~]# /usr/sbin/oracleasm listdisks   #查看asm的磁盤的創(chuàng)建情況[root@oracle1 ~]# /usr/sbin/oracleasm scandisks  #一個節(jié)點創(chuàng)建磁盤后，另一個節(jié)點掃描磁盤即可[grid@stageoem1 ~]$ asmcmd -pASMCMD [+] >lsdskPathORCL:DATA_0000ORCL:DATA_0001ORCL:INDX_0000ASMCMD [+] >

4 、查詢已新創(chuàng)建的ASM磁盤信息

SQL>SELECT     NVL(a.name, '[CANDIDATE]')      disk_group_name     , b.path                          disk_file_path     , b.name                          disk_file_name     , b.failgroup                     disk_file_fail_groupFROM  v$asm_diskgroup a RIGHT OUTER JOIN v$asm_disk b USING (group_number)ORDER BY a.name;

5、添加asm disk到asm磁盤組 DATA (you need to login as sysasm not sysdba)

SQL>ALTER DISKGROUP DATA ADD DISK 'ORCL:DATA_0001';Diskgroup altered.SQL>SELECT     NVL(a.name, '[CANDIDATE]')      disk_group_name     , b.path                          disk_file_path     , b.name                          disk_file_name     , b.failgroup                     disk_file_fail_groupFROM v$asm_diskgroup a RIGHT OUTER JOIN v$asm_disk b USING (group_number)ORDER BY a.name;

2.3 結(jié)果驗證

1、驗證asm磁盤組

SQL>SELECT GROUP_NUMBER,NAME,SECTOR_SIZE,BLOCK_SIZE,ALLOCATION_UNIT_SIZE,STATE,TYPE TOTAL_MB,FREE_MB FROM V$ASM_DISKGROUP;

2 、驗證asm磁盤

SQL>SELECT MOUNT_STATUS,HEADER_STATUS,MODE_STATUS,STATE,TOTAL_MB,FREE_MB,NAME,PATH,LABEL FROM V$ASM_DISK;

三 、小結(jié)

擴容磁盤組的大概步驟如下：

1、新增共享磁盤到兩rac節(jié)點

2
、對共享磁盤進行分區(qū)

3、創(chuàng)建asm磁盤，并加入到asm磁盤組

4 、驗證結(jié)果

投稿時間：2022-06-04  最后更新：2022-09-07