Reclaiming space on a disk, disk group, or enclosure


Reclaiming space on a disk, disk group, or enclosure
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Use the vxdisk reclaim command to trigger online Thin Reclamation on one or more disks, disk groups, or enclosures. By default, the vxdisk reclaim command performs Thin Reclamation on the disks where the VxVM volume is on a "mounted" VxFS file system. The reclamation skips disks that do not have a VxFS file system mounted. Thin reclamation is not supported for RAID-5 volumes, or for instant snapshots.

Reclaiming space on a disk

Use the following command to trigger reclamation:
```
# vxdisk reclaim [disk...]
```
For example, to trigger reclamation on LUNs hitachi_usp0_065a and hitachi_usp0_065b:
```
# vxdisk reclaim hitachi_usp0_065a hitachi_usp0_065b
```
In the above example, suppose the hitachi_usp0_065a contains a VxVM volume vol1 with a VxFS file system. If the VxFS file system is not mounted, the command skips reclamation for hitachi_usp0_065a. The command scans hitachi_usp0_065b, and reclaims any unused space.

Performing an aggressive space reclamation on a disk

Use the following command to trigger reclamation:
```
# vxdisk -o full reclaim [disk...]
```
For example, to trigger reclamation on LUNs hitachi_usp0_065a:
```
# vxdisk -o full reclaim hitachi_usp0_065a
```
In the above example, suppose the hitachi_usp0_065a contains a VxVM volume vol1 with a VxFS file system mounted. With the -o full option, the above command scans hitachi_usp0_065a for unused space outside of the vol1, and reclaims any unused space found. For example, if there is space between subdisks, it is reclaimed.

Reclaiming space on a disk group

Use the following command to trigger reclamation:
```
# vxdisk reclaim diskgroup
```
For example, to trigger reclamation on the disk group oradg:
```
# vxdisk reclaim oradg
```

Reclaiming space on an enclosure

Use the following command to trigger reclamation:
```
# vxdisk reclaim enclosure
```
For example, to trigger reclamation on the enclosure=EMC_CLARiiON0:
```
# vxdisk reclaim EMC_CLARiiON0
```

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