VERITAS Volume Manager 3.1 Storage Administrator Administrator's Guide

Volume Tasks
Adding a Log to a Volume
Chapter 4 171
Adding a Log to a Volume
This procedure adds the appropriate type of log to a mirrored or RAID-5
volume.
To add a DRL log to a mirrored volume
This procedure adds a Dirty Region Logging (DRL) log to a mirrored
volume. DRL uses this log to track the regions of the volume that change
due to I/O writes. If a system failure occurs, DRL uses the information in
the log to recover only the portions of the volume that need recovery. This
speeds up recovery time for mirrored volumes.
For DRL to be in effect, a mirrored volume must have at least one DRL
log. You can create additional DRL logs (on different disks) to mirror the
DRL information.
Step 1. Select the mirrored volume to contain the log.
Step 2. Choose Volumes > Log > Add (Selected menu) or Volume Add Log
(Command Launcher).
Step 3. Complete the Add Log dialog box as follows:
When you have provided all necessary information in the dialog box,
click OK.
To add a log to a RAID-5 volume
This procedure adds a log to a RAID-5 volume. RAID-5 logs speed up the
Volume Name: If the correct volume name is not already displayed in
this field, type the volume’s name or click Browse to
select the volume.
Options To place the log on a specific disk, type the name of the
disk in the Disk Name field or click Browse to select a
disk.
Notes:
• This task requires a volume name.
• When a log is added to a mirrored volume, dirty region logging is
activated for that volume.