The default value is 128. Larger systems could use higher values to increase mirror resynchronization speed.
128 to 2048
Blocks (512 bytes)
If you use Solaris Volume Manager RAID 1 volumes (mirrors), and you want to increase the speed of mirror resynchronizations. Assuming that you have adequate memory for overall system performance, you can increase this value without causing other performance problems.
If you need to increase the speed of mirror resynchronizations, increase the value of this parameter incrementally (using 128-block increments) until performance is satisfactory. On fairly large or new systems, a value of 2048 seems to be optimal. High values on older systems might hang the system.
The default value is disabled, which requires that a majority of all replicas are available and synchronized before Solaris Volume Manager will start.
0 (disabled) or 1 (enabled)
Use of this parameter is not supported.
Some people using Solaris Volume Manager accept the risk of enabling this parameter if all three of the following conditions apply:
When root (/) or other system-critical file systems are mirrored
Only two disks or controllers are available
An unattended reboot of the system is required
If this parameter is enabled, the system might boot with a stale replica that inaccurately represents the system state (including which mirror sides are good or in Maintenance state). This situation could result in data corruption or system corruption.
Change this parameter only if system availability is more important than data consistency and integrity. Closely monitor the system for any failures. You can mitigate the risk by keeping the number of failed, Maintenance, or hot-swapped volumes as low as possible.
For more information about state database replicas, see Chapter 6, State Database (Overview), in Solaris Volume Manager Administration Guide.