Re: Hard drive failures

Jeff,

1) Are each group of 8 drives in a single Raid5 set ? You could have two
Raid5 sets in the CEC and two Raid5 sets in the expansion. Based upon your
post, I'm not sure... we have our vintage Power5 Raid5 configured with
more sets than less to REDUCE risk as spinny drives will fail.

2) Is it safe to assume your firmware is @ SF240_418 (DSPFMWSTS) and
PTFlevels: SF99710 (cumulative)
Lvl C3298710, SF99705 (Hardware) Lvl 6 ? (WRKPTFGRP)

3) Today we replaced a known good 4327 with another known good cold spare
4327 using concurrent maintenance and rebuilt the Raid5 set. This was
purely a training exercise on a Power5 running 7.1. Rebuild took exactly
90 minutes, IBM CE called us when we were < 5% rebuilt. I noticed an
interesting option within SST: "2. Disk unit problem recovery procedures",
"3. Analyze disk unit surface". So to the GROUP, does anyone use the
"Analyze disk unit surface" as a preventative measure ? What value does
this option have ? Are there any best practices or recommends on it's use
? Would anyone suggest that Jeff run Analyze disk unit surface on each
unit ?

4) +1 Jim Oberholtzer


Cheers !



On Tue, Feb 25, 2014 at 6:30 PM, Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>wrote:

Back home now having a Barley Pop.

All good information in these posts. Keep them coming.

I have several quotes pending. Those involving IBM i are:

1) short term - going to Raid 6
2) longer term - power 7/8 or cloud



On Tue, Feb 25, 2014 at 8:02 PM, Steinmetz, Paul <PSteinmetz@xxxxxxxxxx

wrote:

On our old Power5 9406-550
36 4328 drives - 1 failure from Nov 2005 to Feb 2013, and that drive
failed gradually over a 2 month period. 8/15/11, failed on 10/8/11.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Holger Scherer
Sent: Tuesday, February 25, 2014 7:20 PM
To: Midrange Systems Technical Discussion
Subject: RE: Hard drive failures

Depends...

our internal statistics on older boxes:

- 73 drives 6717 (!) on old boxes - no failure in the last 12 months
- 168 drives 6718 on old boxes - 1 failure in the last 12 months
- 40 drives 6719 on old boxes - 8 failures in the last 12 months
- 180 drives 4326 on aged boxes - 1 failure in the last 12 months
- 168 drives 4327 on i5 boxes - 9 failures in the last 12 months
- 84 drives 4328 on i5 boxes - 3 failures in the last 12 months

drives in Power6 boxes and newer: <1% of failing drives in 12 months.
Nothing to worry about.

The old 6717 are rock-solid unless you power them down. And yes - we run

a

lot of old customer boxes for archive purposes. Old software forces them

to

:-)

-h

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer

Age. Your mean time between failure date on those drives has long since
passed.




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Jeff Crosby
VP Information Systems
UniPro FoodService/Dilgard
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531
www.dilgardfoods.com

The opinions expressed are my own and not necessarily the opinion of my
company. Unless I say so.
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