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

■ Type the following vxdg set command:
# vxdg -g diskgroup set maxdev=max-devices
The maxdev attribute can take any positive integer value that is greater than
the number of devices that are currently in the disk group.
Changing the DRL map and log size
If DRL is enabled on a newly-created volume without specifying a log or map size,
default values are used. You can use the command line attributes logmap_len and
loglen in conjunction with the vxassist, vxvol, and vxmake commands to set
the DRL map and DRL log sizes. The attributes can be used independently, or they
can be combined.
You can change the DRL map size and DRL log size only when the volume is
disabled and the DRL maps are not in use. Changes can be made to the DRL map
size only for volumes in a CDS disk group.
The logmap_len attribute specifies the required size, in bytes, for the DRL log. It
cannot be greater than the number of bytes available in the map on the disk.
To change the DRL map and log size
■ Use the following commands to remove and rebuild the logs:
# vxassist -g diskgroup remove log volume nlog=0
# vxassist -g diskgroup addlog volume nlog=nlogs \
logtype=drl logmap_len=len-bytes [loglen=len-blocks]
Note the following restrictions
The DRL log size is set to the default
value (33 * disk group alignment).
If only logmap_len is specified
The command fails, and you need to
either provide a sufficiently large
loglen value or reduce logmap_len.
If logmap_len is greater than (DRL log
size)/2
The DRL map and log sizes are set to a
minimum of 2 * (disk group alignment).
For CDS disk groups
Creating a volume with a DRL log
To create a volume with a traditional DRL log by using the vxassist command
■ Type the following command:
479Migrating data between platforms
Maintaining your system