Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

To migrate to thin provisioning

Check if the SmartMove Feature is enabled.

See “Displaying the SmartMove configuration” on page 114.

See “Changing the SmartMove configuration” on page 114.

Add the new, thin LUNs to the existing disk group. Enter the following

commands:

# vxdisksetup -i da_name

# vxdg -g datadg adddisk da_name

where da_name is the disk access name in VxVM.

To identify LUNs with the thinonly or thinrclm attributes, enter:

# vxdisk -o thin list

Add the new, thin LUNs as a new plex to the volume.

NOTE: The VxFS file system must be mounted to get the benefits of the

SmartMove feature.

The following methods are available to add the LUNs:

■ Use the default settings for the vxassist command:

# vxassist -g datadg mirror datavol da_name

■ Specify the vxassist command options for faster completion. The -b

option copies blocks in the background. The following command has more

I/O affect:

# vxassist -b -oiosize=1m -t thinmig -g datadg mirror \

datavol da_name

# vxtask monitor thinmig

■ Specify the vxassist command options for minimal effect. The following

command takes longer to complete:

# vxassist -oslow -g datadg mirror datavol da_name

Optionally, test the performance of the new LUNs before removing the old

LUNs.

To test the performance, use the following steps:

■ Determine which plex corresponds to the thin LUNs:

115Migrating data from thick storage to thin storage

Migrating to thin provisioning