之前刷机提到在使用OEDA进行一键部署前，需先在所有DB节点上运行reclaimdisks.sh，也提到观察会释放pvs/vgs/lvs相对应的剩余空间。
本文以一套X8环境为例，来看下具体的表现，以加深理解。
1.reclaim的相关命令
查看当前的分区信息：
# /opt/oracle.SupportTools/reclaimdisks.sh -check
在一键部署前，需先在所有DB节点上运行reclaim：
# /opt/oracle.SupportTools/reclaimdisks.sh -free -reclaim
2.运行reclaim之前的情况
查看当前的分区信息：# /opt/oracle.SupportTools/reclaimdisks.sh -check
Model is ORACLE SERVER X8-2
Number of LSI controllers: 1
Physical disks found: 4 (252:0 252:1 252:2 252:3)
Logical drives found: 1
Linux logical drive: 0
RAID Level for the Linux logical drive: 5
Physical disks in the Linux logical drive: 4 (252:0 252:1 252:2 252:3)
Dedicated Hot Spares for the Linux logical drive: 0
Global Hot Spares: 0
Valid. Disks configuration: RAID5 from 4 disks with no global and dedicated hot spare disks.
Valid. Booted: Linux. Layout: Linux + DOM0.
可以看到最后有个DOM0。
此时查询vgs/pvs/lvs信息，会发现vg中已经没有可用空间了：
# vgs
VG #PV #LV #SN Attr VSize VFree
VGExaDb 1 7 0 wz--n- 3.27t 0
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 VGExaDb lvm2 a-- 3.27t 0
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
LVDbExaVMImages VGExaDb -wi-a----- 3.06t
LVDbOra1 VGExaDb -wi-ao---- 100.00g
LVDbSwap1 VGExaDb -wi-ao---- 24.00g
LVDbSys1 VGExaDb -wi-ao---- 30.00g
LVDbSys2 VGExaDb -wi-a----- 30.00g
LVDbSys3 VGExaDb -wi-a----- 30.00g
LVDoNotRemoveOrUse VGExaDb -wi-a----- 1.00g
3.运行reclaim之后的情况
执行reclaim：
# /opt/oracle.SupportTools/reclaimdisks.sh -free -reclaim
之后再次查询vgs/pvs/lvs信息，会发现vg中已经有3T+可用空间：
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 VGExaDb lvm2 a-- 3.27t 3.09t
# vgs
VG #PV #LV #SN Attr VSize VFree
VGExaDb 1 5 0 wz--n- 3.27t 3.09t
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync 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
LVDoNotRemoveOrUse VGExaDb -wi-a----- 1.00g
此时再去做check：
# /opt/oracle.SupportTools/reclaimdisks.sh -check
Model is ORACLE SERVER X8-2
Number of LSI controllers: 1
Physical disks found: 4 (252:0 252:1 252:2 252:3)
Logical drives found: 1
Linux logical drive: 0
RAID Level for the Linux logical drive: 5
Physical disks in the Linux logical drive: 4 (252:0 252:1 252:2 252:3)
Dedicated Hot Spares for the Linux logical drive: 0
Global Hot Spares: 0
Valid. Disks configuration: RAID5 from 4 disks with no global and dedicated hot spare disks.
Valid. Booted: Linux. Layout: Linux.
不难发现：lv里面的那个3.06T的LVDbExaVMImages被回收了，同时check结果中的DOM0也随之不见了。