Exadata出厂时，其计算节点本地有4块盘，两两做RAID 1，安装了双OS，一个是Linux，一个是Solaris X86（不是Sparc，O(∩_∩)O哈哈~）
X2是每块本地盘300G，从X3开始，每块本地盘600G。
多出一个没用的OS，这样就浪费了很多空间，因此，安装或者重装后，一般都做Reclaim的操作，将出厂时的双OS改为单独的Linux系统启动，并释放空间。
例如这里：
[root@dm01db02 ~]# /opt/oracle.SupportTools/reclaimdisks.sh -check [INFO] This is SUN FIRE X4170 M2 SERVER machine [INFO] Number of LSI controllers: 1 [INFO] Physical disks found: 4 (252:0 252:1 252:2 252:3) [INFO] Logical drives found: 3 [INFO] Dual boot installation: yes [INFO] Linux logical drive: 0 [INFO] RAID Level for the Linux logical drive: 1 [INFO] Physical disks in the Linux logical drive: 2 (252:0 252:1) [INFO] Dedicated Hot Spares for the Linux logical drive: 0 [INFO] Global Hot Spares: 0 [INFO] Valid dual boot configuration found for Linux: RAID1 from 2 disks [root@dm01db02 ~]#
这里显示当前4块本地盘，做了双启动系统，每两块盘做了RAID 1，没有Hot Spares盘
使用reclaimdisks.sh -free -reclaim可以更改为一个单独的系统，大部分客户会选择使用Linux，例如：
[root@dm01db02 ~]# /opt/oracle.SupportTools/reclaimdisks.sh -free -reclaim Started from /opt/oracle.SupportTools/reclaimdisks.sh [INFO] Free mode is set [INFO] Reclaim mode is set [INFO] This is SUN FIRE X4170 M2 SERVER machine [INFO] Number of LSI controllers: 1 [INFO] Physical disks found: 4 (252:0 252:1 252:2 252:3) [INFO] Logical drives found: 3 [INFO] Dual boot installation: yes [INFO] Linux logical drive: 0 [INFO] RAID Level for the Linux logical drive: 1 [INFO] Physical disks in the Linux logical drive: 2 (252:0 252:1) [INFO] Dedicated Hot Spares for the Linux logical drive: 0 [INFO] Global Hot Spares: 0 [INFO] Non-linux physical disks that will be reclaimed: 2 (252:2 252:3) [INFO] Non-linux logical drives that will be reclaimed: 2 (1 2) Remove logical drive 1 Adapter 0: Deleted Virtual Drive-1(target id-1) Exit Code: 0x00 Remove logical drive 2 Adapter 0: Deleted Virtual Drive-2(target id-2) Exit Code: 0x00 [INFO] Remove Solaris entries from /boot/grub/grub.conf [INFO] Disk reclaiming started in the background with parent process id 110717. [INFO] Check the log file /var/log/cellos/reclaimdisks.bg.log. <strong>[INFO] This process may take about two hours.</strong> <strong>[INFO] DO NOT REBOOT THE NODE.</strong> <strong>[INFO] The node will be rebooted automatically upon completion.</strong>
reclaim的过程大概2小时左右，完成后的结果类似下面：
[root@dm01db02 ~]# /opt/oracle.SupportTools/reclaimdisks.sh -check [INFO] This is SUN FIRE X4170 M2 SERVER machine [INFO] Number of LSI controllers: 1 [INFO] Physical disks found: 4 (252:0 252:1 252:2 252:3) [INFO] Logical drives found: 1 [INFO] Dual boot installation: no [INFO] Linux logical drive: 1 [INFO] RAID Level for the Linux logical drive: 5 [INFO] Physical disks in the Linux logical drive: 3 (252:1 252:2 252:3) [INFO] Dedicated Hot Spares for the Linux logical drive: 0 [INFO] Global Hot Spares: 1 (252:0) [INFO] Valid single boot configuration found for Linux: RAID5 from 3 disks and 1 global hot spare disk [root@dm01db02 ~]#
这里，我们看到，4块本地盘，一个做了Hot spare disk，其余3块做RAID5，只有一个Linux OS了。
这样就把以前Solaris X86 OS 的空间释放出来了，但是这部分空间缺省并没有自动mount上，你需要手工的mount上，或者自己使用LVM扩充到根目录（/）或者非根目录（比如/u01等等），或者扩到Swap区。
例如：
[root@dm01db01 ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert LVDbOra1 VGExaDb -wi-ao 100.00G LVDbSwap1 VGExaDb -wi-ao 24.00G LVDbSys1 VGExaDb -wi-ao 30.00G [root@dm01db01 ~]# [root@dm01db01 ~]# vgs VG #PV #LV #SN Attr VSize VFree VGExaDb 1 3 0 wz--n- 557.62G <strong>403.62G</strong> [root@dm01db01 ~]#
这里我们看到做完reclaim后，释放出来400G左右的空间，这个是X2，每块本地盘300G。
如果是X3，每块本地盘600G，做完reclaim后释放出来600G左右的空间，就类似下面的样子：
[root@dm04db01 ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert LVDbOra1 VGExaDb -wi-ao 100.00G LVDbSwap1 VGExaDb -wi-ao 24.00G LVDbSys1 VGExaDb -wi-ao 30.00G LVDbSys2 VGExaDb -wi-a- 30.00G temp VGExaDb -wi-ao 50.00G [root@dm04db01 ~]# vgs VG #PV #LV #SN Attr VSize VFree VGExaDb 1 5 0 wz--n- 834.89G<strong> 600.89G</strong> [root@dm04db01 ~]# [root@dm04db01 ~]# [root@dm04db01 ~]#
现在你就可以使用lvm lvexten等命令，将这些空间扩到你需要的放了，O(∩_∩)O哈哈~。
