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.

Select the mirrored volume to contain the log.
Choose Volumes > Log > Add (Selected menu) or Volume Add Log (Command Launcher).

Complete the Add Log dialog box as follows:

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.

When you have provided all necessary information in the dialog box, click OK.

Notes:
This task requires a volume name. When a log is added to a mirrored volume, dirty region logging is activated for that volume.

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 resynchronization time for RAID-5 volumes after a system failure. A RAID-5 log maintains a copy of the data and parity being written to the volume at any given time. If a system failure occurs, the Volume Manager can "replay" the RAID-5 log to resynchronize the volume. This copies the data and parity that was being written at the time of failure from the log to the appropriate areas of the RAID-5 volume.

You can create multiple RAID-5 logs (on different disks) to mirror the log information. Ideally, each RAID-5 volume should have at least two logs.

Select the RAID-5 volume to contain the log.
Choose Volumes > Log > Add (Selected menu) or Volume Add Log (Command Launcher).

Complete the Add Log dialog box as follows:

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.

When you have provided all necessary information in the dialog box, click OK.

Notes:
This task requires a volume name.

Adding a Log to a Volume

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To add a DRL log to a mirrored volume

To add a log to a RAID-5 volume