oracle RAC 更换存储迁移数据(在线迁移ASM磁盘组）测试
我们利用ASM rebalance特性实现更换存储迁移数据的需求
基本零宕机时间（操作步骤总结）
1）保证新存储和RAC当前节点间的可用性；
2）新存储划分LUN，可以重新规划存储方案；
3）迁移OCR和表决盘
4）给现有ASM磁盘组添加ASM磁盘(新存储分配的)，充分利用ASM REBALANCE技术
5）删除原存储的ASM磁盘
6）观察期
注意：
1）.关于替换ocr votedisk 已经在之前的文章里已经测试过了，详细可参考：
http://blog.csdn.net/shiyu1157758655/article/details/61195600
2）本次接着上次的ocr votedisk 的替换之后，替换数据磁盘组
具体步骤：
1.登录到ASM实例，查看当前磁盘组的信息
SQL> select group_number,name,type,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME TYPE TOTAL_MB FREE_MB
------------ ---------------------------------------- ------ ---------- ----------
1 DATA EXTERN 51200 47921
2 FRA_ARC EXTERN 20480 19557
3 OCR_VOTING_NEW NORMAL 12288 11236
SQL>
注意:其中OCR_VOTING_NEW 是之前新添替换的OCR磁盘
SQL> select NAME,PATH,total_mb,free_mb from v$asm_disk;
NAME PATH TOTAL_NAME FRR_MB
------------ ---------------------------------------- ------ ---------- ----------
OCR_VOTING_NEW_0001 /dev/asm-diski 4096 3746
OCR_VOTING_NEW_0000 /dev/asm-diskh 4096 3745
FRA_ARC_0000 /dev/asm-diskg 20480 19557
DATA_0000 /dev/asm-diskf 51200 47911
/dev/asm-diskd 0 0
/dev/asm-diskc 0 0
/dev/asm-diske 0 0
/dev/asm-diskl 0 0
/dev/asm-diskk 0 0
注意：/dev/asm-diskc /dev/asm-diskd /dev/asm-diske 这3个磁盘是之前旧的OCR VOTDDISK 的3块盘
/dev/asm-diskk 为要添加的新的DATA 磁盘
/dev/asm-diskl 为要添加的新的日志盘
2.迁移数据磁盘组数据
SQL> alter diskgroup DATA add disk '/dev/asm-diskk' rebalance power 11; //添加磁盘data磁盘
Diskgroup altered.
SQL> alter diskgroup FRA_ARC add disk '/dev/asm-diskl' rebalance power 11;//添加磁盘日志磁盘
SQL> select * from v$asm_operation;
GROUP_NUMBER OPERA STAT POWER ACTUAL SOFAR EST_WORK EST_RATE
------------ ----- ---- ---------- ---------- ---------- ---------- ----------
EST_MINUTES ERROR_CODE
----------- --------------------------------------------
1 REBAL RUN 11 11 550 1460 1546
0
由于指定rebalance power 11，ASM会自动均衡ASM磁盘组DATA里面存放的数据在各ASM磁盘的分布。
当rebalance结束后，查询V$ASM_OPERATION视图，将不会返回信息。
注意一定要查询未空时才能进行删除操作
SQL> select * from v$asm_operation;
no rows selected
此时查询磁盘组信息
SQL> select group_number,name,type,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME TYPE TOTAL_MB FREE_MB
------------ ---------------------------------------- ------ ---------- ----------
1 DATA EXTERN 92160 88869
2 FRA_ARC EXTERN 40960 40035
3 OCR_VOTING_NEW NORMAL 12288 11236
SQL>
观察DATA和FRA_ARC的磁盘大小
SQL> select name,path,state from v$asm_disk;
------------ ---------------------------------
NAME PATH STATE
FRA_ARC_0001 /dev/asm-diskl NORMAL
DATA_0001 /dev/asm-diskk NORMAL
OCR_VOTING_NEW_0002 /dev/asm-diskj NORMAL
OCR_VOTING_NEW_0001 /dev/asm-diski NORMAL
OCR_VOTING_NEW_0000 /dev/asm-diskh NORMAL
FRA_ARC_0000 /dev/asm-diskg NORMAL
DATA_0000 /dev/asm-diskf NORMAL
/dev/asm-diskd NORMAL
/dev/asm-diskc NORMAL
/dev/asm-diske NORMAL
3.删除数据磁盘组上的旧的磁盘
Diskgroup altered.
SQL> alter diskgroup FRA_ARC drop disk 'FRA_ARC_0000' rebalance power 11;
Diskgroup altered.
SQL> select * from v$asm_operation;
GROUP_NUMBER OPERA STAT POWER ACTUAL SOFAR EST_WORK EST_RATE EST_MINUTES ERROR_CODE
------------ ----- ---- ---------- ---------- ---------- ---------- ---------- ----------- --------------------------------------------
1 REBAL RUN 11 11 122 1827 730 2
SQL> select * from v$asm_operation;
no rows selected
SQL>
ASM不但向磁盘组中加入新磁盘时会做rebalance，在删除ASM磁盘时也会rebalance，将该磁盘上的数据rebalance到其他该磁盘组的磁盘中。
按照此方法删除ASM磁盘后，ASM的所有数据都已经存放在新的存储上。
这时在查看磁盘组信息
SQL> select group_number,name,type,total_mb,free_mb from v$asm_diskgroup;GROUP_NUMBER NAME TYPE TOTAL_MB FREE_MB
------------ ---------------------------------------- ------ ---------- ----------
1 DATA EXTERN 40960 37671
2 FRA_ARC EXTERN 20480 19557
3 OCR_VOTING_NEW NORMAL 12288 11236
SQL>
注意观察此时的磁盘组大小
SQL> select name,path,state from v$asm_disk;
NAME PATH STATE
------------ ----------------------------------------
FRA_ARC_0001 /dev/asm-diskl NORMAL
DATA_0001 /dev/asm-diskk NORMAL
OCR_VOTING_NEW_0002 /dev/asm-diskj NORMAL
OCR_VOTING_NEW_0001 /dev/asm-diski NORMAL
OCR_VOTING_NEW_0000 /dev/asm-diskh NORMAL
/dev/asm-diskd NORMAL
/dev/asm-diskc NORMAL
/dev/asm-diske NORMAL
/dev/asm-diskf NORMAL
/dev/asm-diskg NORMAL
查看crs是否正常
+ASM1:/home/grid@rac1>crsctl stat res -t
--------------------------------------------------------------------------------
NAME TARGET STATE SERVER STATE_DETAILS
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
ONLINE ONLINE rac1
ONLINE ONLINE rac2
ONLINE ONLINE rac3
ora.FRA_ARC.dg
ONLINE ONLINE rac1
ONLINE ONLINE rac2
ONLINE ONLINE rac3
ora.LISTENER.lsnr
ONLINE ONLINE rac1
ONLINE ONLINE rac2
ONLINE ONLINE rac3
ora.OCR_VOTING_NEW.dg
ONLINE ONLINE rac1
ONLINE ONLINE rac2
ONLINE ONLINE rac3
ora.asm
ONLINE ONLINE rac1 Started
ONLINE ONLINE rac2 Started
ONLINE ONLINE rac3 Started
ora.gsd
OFFLINE OFFLINE rac1
OFFLINE OFFLINE rac2
OFFLINE OFFLINE rac3
ora.net1.network
ONLINE ONLINE rac1
ONLINE ONLINE rac2
ONLINE ONLINE rac3
ora.ons
ONLINE ONLINE rac1
ONLINE ONLINE rac2
ONLINE ONLINE rac3
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.LISTENER_SCAN1.lsnr
1 ONLINE ONLINE rac1
ora.cvu
1 ONLINE ONLINE rac3
ora.oc4j
1 ONLINE ONLINE rac3
ora.rac.db
1 ONLINE ONLINE rac1 Open
2 ONLINE ONLINE rac2 Open
3 ONLINE ONLINE rac3 Open
ora.rac1.vip
1 ONLINE ONLINE rac1
ora.rac2.vip
1 ONLINE ONLINE rac2
ora.rac3.vip
1 ONLINE ONLINE rac3
ora.scan1.vip
1 ONLINE ONLINE rac1
+ASM1:/home/grid@rac1>
至此在线迁移ASM磁盘组测试结束