System Administration Guide
Chapter 8, Administering virtual disks

Checking and restoring parity data

Checking and restoring parity data

You can check the disk for valid parity information, reconstruct parity (restore), or fix errors.

In the Virtual Disk Manager, select a virtual disk, then select Maintenance from the Disk menu.

Select either Fast restore or Slow restore from the Maintenance submenu of the Disk menu to update parity information when an array is initially configured, or to reconstruct data on a disk that has been repaired. The virtual disk remains accessible during this restore operation.

Select Check Parity from the Maintenance submenu to ensure that disk data and parity are correctly matched.

If a drive fails and the system is offline for repairs, see Chapter 18, ``Adding hard disks'' in the SCO OpenServer Handbook for more information on replacing or repairing it.

In event of a restart following an unscheduled shutdown, parity information is automatically restored when the system reaches run level 2 (goes multiuser). Parity restoration on reboot can be either slow or fast. A fast restore reduces the period during which the virtual disk is vulnerable to a second failure, but impacts system performance; a slow restore has little impact on system performance but takes significantly longer. Automatic parity restoration is controlled by /etc/rc2.d/S81VDRESTORE; you can change the speed of restoration by editing this shell script.