PERC3-DI Raid 5

Ben Russo ben at muppethouse.com
Wed May 5 15:09:00 CDT 2004


I had a 5 disk RAID 5 volume with 143GB Ultra 160 SCSI disks.
At the PERC-3di   Bios screen (e.g. no activity at all except rebuilding)
it took more than 12 hours to rebuild the volume.

-Ben.

Jason_Mick at dell.com wrote:

>The rebuild time is hard to measure.  It depends on the activity of the
>server at the time of failure/rebuild.  I would guess about 3-4 hours
>with the server at minimal use.
>
>As far as the drive...  The short answer is: Yes, if you purchase a
>drive from Dell with the intent to upgrade the server the drive is now
>covered under the warranty that is on the server.  I would recommend
>that you keep your order number that you purchased the drive on so that
>the technician with Dell knows the drive came from us and it is not a
>third party drive. 
>
>Jason
>
>-----Original Message-----
>From: Ryan Brown [mailto:dell at tblive.com] 
>Sent: Tuesday, April 27, 2004 12:59 PM
>To: Mick, Jason; linux-poweredge at dell.com
>Subject: RE: PERC3-DI Raid 5
>
>Thanks.
>
>Any idea or rough estimate how long it takes to rebuild a drive? They
>are 73
>GB 10k RPM drives on a 3 GHz Xeon with 1.5 GB ram. I am assuming the
>rebuild
>is automatic, correctly me if I am wrong.
>
>Also not sure if anyone knows the answer to this as it is more a sales /
>warranty issue. If I were to buy an identical 4th drive to the 3 that
>are
>currently in my system (that is covered by a 3 years, 4 hour parts and
>labor
>support contract), does this drive get the same support if it were to
>fail
>or would it have its own support contract that may be next day
>replacement.
>
>
>Ryan
>
>
>
>-----Original Message-----
>From: Jason_Mick at Dell.com [mailto:Jason_Mick at Dell.com] 
>Sent: Tuesday, April 27, 2004 1:51 PM
>To: dell at tblive.com; linux-poweredge at dell.com
>Subject: RE: PERC3-DI Raid 5
>
>1. Yes you could lose more then one drive if the hotspare had the time
>to complete the rebuild before the next drive fell off line.  
>As an Example: Let say that drive 0 fell off line.  Drive 3 would jump
>in and rebuild taking over for drive 0.  If drive 2 failed prior to the
>rebuild completing on drive 3 then the server would fail.  You cannot
>lose more then one drive in a RAID 5 set.  
>
>2. As far as setting this up with out losing data.  Yes you can.  Either
>by using the AFACLI or by using the control-a bios utility.
>
>In my experience if you have more then one drive fail in a short period
>of time like over a weekend then there is something more then just a
>drive at fault.
>
>
>Jason 
>
>-----Original Message-----
>From: linux-poweredge-admin at dell.com
>[mailto:linux-poweredge-admin at dell.com] On Behalf Of Ryan Brown
>Sent: Tuesday, April 27, 2004 12:01 PM
>To: linux-poweredge at dell.com
>Subject: PERC3-DI Raid 5
>
>I have a 2650 with the PERC3-DI card doing Raid 5 (73 GB x 3). I want to
>add
>a 4th 73 GB drive (same drive from Dell) so that I have a hot spare.
>
>I have 2 questions...
>
>1) If I add a 4th drive as a hot spare, I can afford to lose 2 hard
>drives
>and still be running fine with no data loss on the other 2 drives right?
>I
>do not want to add additional storage space, but just use this 4th drive
>as
>a "hot spare" (I think this is the right term?) so I can afford to lose
>an
>additional drive (I don't want to be out of town and worry if 1 drive
>fails
>that another will too before I can get back to fix it, the chance 2 go
>bad
>during a week seems very unlikely to me).
>
>2) This server is currently a live server running my email and web site.
>Can
>I add this 4th drive into the array without rebuilding linux? I can
>afford
>to reboot it (which I assume I will need to do to get into the Raid
>utilities to add it) but I do not want it to be down for an entire day
>to
>reinstall linux and configure it.
>
>Thanks 
>
>
>
>
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