VERITAS Volume Manager 3.1 Administrator's Guide

Volume Manager Operations
Volume Resynchronization
Chapter 3 111
by placing the volume in recovery mode (also called read-writeback
recovery mode). Resynchronization of data in the volume is done in the
background. This allows the volume to be available for use while
recovery is taking place.
The process of resynchronization can be expensive and can impact
system performance. The recovery process reduces some of this impact
by spreading the recoveries to avoid stressing a specific disk or controller.
For large volumes or for a large number of volumes, the
resynchronization process can take time. These effects can be addressed
by using Dirty Region Logging for mirrored volumes, or by ensuring that
RAID-5 volumes have valid RAID-5 logs. For volumes used by database
applications, the VxSmartSync™ Recovery Accelerator can be used (see
“VxSmartSync Recovery Accelerator”).