asm创建删除磁盘，磁盘组和rebalance操作

时间：2021-11-23 21:32:45

[grid@lzl1 ~]$ sqlplus / as sysasm


SQL*Plus: Release 11.2.0.3.0 Production on Fri Oct 20 15:20:44 2017


Copyright (c) 1982, 2011, Oracle.  All rights reserved.




Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options


SQL>

现有磁盘

SQL> select name,free_mb,total_mb from v$asm_disk;

NAME   FREE_MB   TOTAL_MB
------------------------------ ---------- ----------
DATA_0002     44245120
DATA_0001     44245120
DATA_0000     44195120
CRS_0002     30895120
CRS_0001     30825120
CRS_0000     30895120

6 rows selected.

SQL> select group_number,operation,state,power from v$asm_operation;

no rows selected


删除磁盘

SQL> alter diskgroup DATA drop disk DATA_0002 rebalance power 5;

Diskgroup altered.

SQL>  select group_number,operation,state,power from v$asm_operation;

GROUP_NUMBER OPERA STAT      POWER
------------ ----- ---- ----------
  2 REBAL RUN5


正在进行rebalance操作

SQL> /

no rows selected

SQL>  select name,free_mb,total_mb,path,state,mount_status,header_status from v$asm_disk;
SQL> col name for a10;
SQL> /

NAME       FREE_MBTOTAL_MB PATHSTATE  MOUNT_S HEADER_STATU
---------- ---------- ---------- --------------- -------- ------- ------------
    0      0 /dev/asm-diskg  NORMAL   CLOSED  FORMER
DATA_0001 4075    5120 /dev/asm-diskf  NORMAL   CACHED  MEMBER
DATA_0000 4074    5120 /dev/asm-diske  NORMAL   CACHED  MEMBER
CRS_0002 3089    5120 /dev/asm-diskd  NORMAL   CACHED  MEMBER
CRS_0001 3082    5120 /dev/asm-diskc  NORMAL   CACHED  MEMBER
CRS_0000 3089    5120 /dev/asm-diskb  NORMAL   CACHED  MEMBER

6 rows selected.

磁盘已删除但仍然识别。

在drop之前DATA组的used mb=（5120-4424）+（5120-4424）+（5120-4419）= 2093

在drop之后DATA组的used mb=（5120-4075）+（5120-4074）= 2091

可以看出used mb几乎是相等的，rebalance把drop盘里的数据平衡分配到其他盘去了。


 创建磁盘组
SQL> create diskgroup fra external redundancy disk '/dev/asm-diskg';

Diskgroup created.
SQL> select name,free_mb,total_mb,path,state,mount_status,header_status from v$asm_disk;

NAME       FREE_MBTOTAL_MB PATHSTATE  MOUNT_S HEADER_STATU
---------- ---------- ---------- --------------- -------- ------- ------------
FRA_0000 5070    5120 /dev/asm-diskg  NORMAL   CACHED  MEMBER
DATA_0001 4075    5120 /dev/asm-diskf  NORMAL   CACHED  MEMBER
DATA_0000 4074    5120 /dev/asm-diske  NORMAL   CACHED  MEMBER
CRS_0002 3089    5120 /dev/asm-diskd  NORMAL   CACHED  MEMBER
CRS_0001 3082    5120 /dev/asm-diskc  NORMAL   CACHED  MEMBER
CRS_0000 3089    5120 /dev/asm-diskb  NORMAL   CACHED  MEMBER

6 rows selected.

asm通过asm_diskstring识别磁盘

SQL> show parameter string


NAME     TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring     string/dev/asm*


我们新增一个磁盘来添加到FRA磁盘组中

[root@lzl1 Desktop]# ls /dev/asm-*
/dev/asm-diskb  /dev/asm-diskd  /dev/asm-diskf  /dev/asm-diskh
/dev/asm-diskc  /dev/asm-diske  /dev/asm-diskg

共享设备已经配置好，/dev/asm-diskg就是我们新增的 

SQL>select name,free_mb,total_mb,path,state,mount_status,header_status from v$asm_disk;



NAME      FREE_MBTOTAL_MB PATHSTATE MOUNT_S HEADER_STATU
---------- ---------- ---------- --------------- -------- ------- ------------
   0       0 /dev/asm-diskh  NORMAL   CLOSED  CANDIDATE
FRA_0000 5070    5120 /dev/asm-diskg  NORMAL   CACHED  MEMBER
DATA_0001 4075   5120 /dev/asm-diskf  NORMAL   CACHED  MEMBER
DATA_0000 4074   5120 /dev/asm-diske  NORMAL   CACHED  MEMBER
CRS_0002 3089    5120 /dev/asm-diskd  NORMAL   CACHED  MEMBER
CRS_0001 3082    5120 /dev/asm-diskc  NORMAL   CACHED  MEMBER
CRS_0000 3089    5120 /dev/asm-diskb  NORMAL   CACHED  MEMBER


7 rows selected


已经自动识别了

在查询下另外一个视图

SQL>  select name,free_mb,total_mb,path,state,mount_status,header_status from v$asm_disk_stat;


NAME      FREE_MBTOTAL_MB PATHSTATE MOUNT_S HEADER_STATU
---------- ---------- ---------- --------------- -------- ------- ------------
FRA_0000 5070    5120 /dev/asm-diskg  NORMAL   CACHED  MEMBER
DATA_0001 4075   5120 /dev/asm-diskf  NORMAL   CACHED  MEMBER
DATA_0000 4074   5120 /dev/asm-diske  NORMAL   CACHED  MEMBER
CRS_0002 3089    5120 /dev/asm-diskd  NORMAL   CACHED  MEMBER
CRS_0001 3082    5120 /dev/asm-diskc  NORMAL   CACHED  MEMBER
CRS_0000 3089    5120 /dev/asm-diskb  NORMAL   CACHED  MEMBER


6 rows selected.


 v$asm_disk_stat不会展示新增的磁盘

 v$asm_disk_stat在官方文档中的描述

V$ASM_DISK_STAT displays performance statistics in the same way that V$ASM_DISK does, but without performing discovery of new disks. This results in a less expensive operation. However, since discovery is not performed, the output of this view does not include any data about disks that are new to the system.
The columns for V$ASM_DISK_STAT are the same as those for V$ASM_DISK.

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