Fault Tolerance Allows FDISKPM to Delete Mirror Partition (99960)




This article was previously published under Q99960

SYMPTOMS

FTSETUP shows other mirrors as being orphaned. FTAdmin shows all drives being cracked with critical errors.

CAUSE

FDISKPM does not label partitions as being mirrors, prevent you from deleting mirror partitions, or warn you if you select a mirror partition for deletion.

RESOLUTION

When you use fault tolerance, document carefully which partitions fault tolerance chooses to be mirrors: mirror one partition at a time and make note of which physical drive is becoming the mirror. To do this you may have to remove the machine's case and watch the disk activity indicator.

Once a mirror is established, use FDISKPM to determine which logical drive now has the mirror partition so that you can correlate physical devices and FDISK drive numbers. Here is how to determine which drive has a mirror:

  1. In FDISKPM select a drive which has a partition but no logical drives assigned.
  2. Note the partition size.
  3. From the Options menu, select Create Logical Drive.
  4. When the "Create Logical" dialog box appears, note the maximum size available to the new drive. If this space is significantly less than the partition size you just recorded, then the difference has been used by the mirror and should be very close, if not identical, to the mirror partition size.
Modification Type: Major Last Reviewed: 7/30/2001
Keywords: KB99960
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