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253Creating volumes
Creating a striped volume
Dirty region logging (DRL), if enabled, speeds recovery of mirrored volumes
after a system crash. To enable DRL on a volume that is created within a disk
group with a version number between 20 and 100, specify the
logtype=drl
attribute to the
vxassist make command as shown in this example usage:
# vxassist [-g diskgroup] make volume length layout=layout \
logtype=drl [nlog=n] [loglen=size] [other attributes]
The nlog attribute can be used to specify the number of log plexes to add. By
default, one log plex is added. The loglen attribute specifies the size of the log,
where each bit represents one region in the volume. For example, the size of the
log would need to be 20K for a 10GB volume with a region size of 64 kilobytes.
For example, to create a mirrored 10GB volume, vol02, with two log plexes in
the disk group, mydg, use the following command:
# vxassist -g mydg make vol02 10g layout=mirror logtype=drl \
nlog=2 nmirror=2
Sequential DRL limits the number of dirty regions for volumes that are written
to sequentially, such as database replay logs. To enable sequential DRL on a
volume that is created within a disk group with a version number between 70
and 100, specify the
logtype=drlseq attribute to the vxassist make command.
# vxassist [-g diskgroup] make volume length layout=layout \
logtype=drlseq [nlog=n] [other attributes]
Note: If you also want to allow the use of Persistent FastResync with the volume,
use the procedure described in “Creating a volume with a version 0 DCO volume”
on page 250.
Creating a striped volume
A striped volume contains at least one plex that consists of two or more subdisks
located on two or more physical disks. For more information on striping, see
“Striping (RAID-0)” on page 38.
Note: A striped volume requires space to be available on at least as many disks in
the disk group as the number of columns in the volume.
To create a striped volume, use the following command:
# vxassist [-b] [-g diskgroup] make volume length layout=stripe
For example, to create the 10-gigabyte striped volume volzebra, in the disk
group, mydg, use the following command:
# vxassist -b -g mydg make volzebra 10g layout=stripe
This creates a striped volume with the default stripe unit size (64 kilobytes) and
the default number of stripes (2).