subdisk

Subdisk

• A subdisk is a subsection of a disk's public region and is the smallest unit of storage in Volume Manager.  

• A subdisk is defined by an offset and a length in sectors on a volume manager disk.

• A volume manager disk can contain multiple subdisks, but subdisks cannot overlap or share the same portions of a volume manager disk.

• Volume manager disk space that is not reserved or that is not part of a subdisk is free space. You can use free space to create new subdisks.

Creating a Subdisk

# vxmake –g <diskgroup> sd disk1-01 disk1,0,100m

This would create a sub-disk called disk1-01 at the start of disk disk01 and would be 100m long.

If you want to create another sub-disk on the same disk (disk01) the offset would be 100m as this is where the next freespace would be on the disk. So

# vxmake –g <diskgroup> sd disk01-02 disk1,100m,100m

This would create another 100m subdisk.

Removing Subdisk

# vxedit rm <sub-disk>

Moving sub-disk

# vxsd mv <old sub-disk> <new sub-disk>

Associating with a plex

# vxmake plex <plex> sd=<sub-disk>

# vxmake plex home-1 sd=disk02-01, disk02-00, disk02-02

Dissociating a Sub-disk

# vxsd dis <sub-disk>

Splitting a Subdisk

# vxsd –s<size> split sd<new sub><newsub2>

Joining a Subdisk

# vxsd join <subdisk1><subdisk2><newsubdisk>