Mirror Drives

  • Thread starter Thread starter sifrach
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sifrach

I have 2 drives and 1 controller that is mirrored. Drive
status is Healty at Risk. I need to fix it to reactivate
it? Anyone knows what that means? What it does?
Thanks
 
[email protected] said:
I have 2 drives and 1 controller that is mirrored. Drive
status is Healty at Risk. I need to fix it to reactivate
it? Anyone knows what that means? What it does?
Thanks
Click to expand...

It means that the disk drive is functional and usable, but that the data on
the "at risk" drive does not match what is expected and has been placed
offline. In a RAID 5 situation, this would indicate a parity or data segment
is out of whack. In a RAID 1 (mirrored) situation, it indicates a data
segment on the "at risk" drive does not match its counterpart on the non-"at
risk" drive.

In both situations, fixing it causes known good data to be used to repair
the bad data. In a RAID 5 situation, it would recalculate the missing data
based on the 2 surviving segments. In a RAID 1 situation, known good data is
simply copied atop known bad data.

In the meantime, while the drive is sitting there disabled, life continues
with the surviving drive(s) in both the RAID 5 and RAID 1 configurations.
Data continues to be stored, updated, deleted and read as if nothing is
wrong. (The big benefit of using RAID 5 or RAID 1.) Of course, the "at risk"
drive continues to get more and more out of synch until the SysAdmin gets
around to doing the repair.

Once the repair is performed and the data is again in synch, the drive is
put back online and life continues.
 
As detailed in Knowledge Base article 313061 HOW TO: Regenerate a Dynamic
Mirrored Volume in Windows 2000 (http://support.microsoft.com/?id=313061),
in Disk Management, right (secondary) click the "at risk" drive, and choose
the option to Reactivate. This should bring the disks in synch and the "at
risk" designation should disappear.

Kevin McNiel, MCSE/MCSA
Platform Server Setup Group

This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to the Group only, This address cannot receive incoming
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