Unable to "un-degrade" a RAID-5 on a PERC 3/Di

[Patrick_Boyd at Dell.com]

If the failed disk isn't present or online then the controller will
reconstruct the data with parity before sending it to the OS, however if
you add a disk and force it online then the controller will send the
block from the disk unchecked.

-----Original Message-----
From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of J. Epperson
Sent: Tuesday, April 08, 2008 12:58 PM
To: linux-poweredge-Lists
Subject: RE: Unable to "un-degrade" a RAID-5 on a PERC 3/Di

On Tue, April 8, 2008 13:29, Patrick_Boyd at dell.com wrote:
> That is a very scary idea. I would highly recommend against that as
> you've just made 1/nth of your data (where n is the number of disks)
an
> unknown value. If it worked you're very lucky you didn't have massive
> data loss/corruption.
>

You mean the 1/nth that was on the failed disk?  Wasn't that already an
unknown value?  Yes, it's scary, but it looks like he's down to last
resorts.  The way you get a replacement disk accepted on PERC
controllers
is not consistent even within a family (LSI or Adaptec), which is pretty
scary in itself.

I wouldn't do ANYTHING to the degraded array before backing up the data,
BTW.

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