Re: Disk Status confusion -- MIDRANGE-L

Its not usual to get failures so quick unless as I found if you shut down
and ipl it some time later. Older disks do not like the change in
temperature and I found that when shutting down systems in winter, the
drive cools more than expected and this results in drives failing. Since I
started keeping my system running all the time, I have not had issues.
Could be I just got lucky.

Another issue with RAID is the life of your CACHE battery. If you lose your
CACHE batteries, the RAID set is usually lost and requires a full
rebuild/restore. If your system is up, there is a procedure to start
recovery before you power down. You must then go into the system and tell
it to turn off RAID and CACHE. I do not remember the exact terminology.
You can then power down, replace the battery and the failed drive and
rebuild your system. Maybe others will chime in on this.

Just my experience.

On Mon, Feb 15, 2021 at 6:21 PM Thomas Garvey <tgarvey@xxxxxxxxxx> wrote:

Thanks, everyone. We had one spare drive and did the replacment. The
advice that replacement was urgent before another failure would cause
complete rebuild from system save was the thing that lit the fire under me.
We are now back to...

Work with Disk Status

Elapsed time: 00:00:00

--Protection--
Unit ASP Type Status Compression
1 1 DPY ACTIVE
2 1 DPY ACTIVE
3 1 DPY ACTIVE
4 1 DPY ACTIVE
5 1 DPY ACTIVE
6 1 DPY ACTIVE
7 1 DPY ACTIVE
8 1 DPY ACTIVE

and...

Display Disk Configuration Status

Serial Resource Hot Spare
ASP Unit Number Type Model Name Status Protection
1 Unprotected
1 Y010D30090TW 198C 099 DMP013 RAID 5/Active N
2 Y6800TV1N64J 198C 099 DMP020 RAID 5/Active N
3 Y010D3008RDW 198C 099 DMP015 RAID 5/Active N
4 Y010D300911A 198C 099 DMP005 RAID 5/Active N
5 Y010D3008UC7 198C 099 DMP001 RAID 5/Active N
6 Y010D3008R7Y 198C 099 DMP011 RAID 5/Active N
7 Y010D3008UBG 198C 099 DMP007 RAID 5/Active N
8 Y210W7K0JQ4C 198C 099 DMP009 RAID 5/Active N

Best Regards,

Thomas Garvey
Corporate Scientist
Unbeaten Path International
630-462-3991
/www.unpath.com <http://www.unpath.com/>
/

On 2/15/2021 3:49 PM, Patrik Schindler wrote:

Hello Thomas,

Am 15.02.2021 um 19:31 schrieb Thomas Garvey <tgarvey@xxxxxxxxxx>:

Display Device Parity Status

Parity Resource Hot Spare
Set ASP Unit Type Model Name Status Protection
1 2BE1 001 DC01 RAID 5 N
1 2 198C 099 DMP020 Unprotected
1 1 198C 099 DMP013 Unprotected
1 4 198C 099 DMP005 Unprotected
1 5 198C 099 DMP001 Unprotected
1 8 198C 099 DMP009 Failed
1 3 198C 099 DMP015 Unprotected
1 6 198C 099 DMP011 Unprotected
1 7 198C 099 DMP007 Unprotected

In addition to other people's valid comments…

I had one occasion some months ago, with a 8203-E4A containing five

disks in a RAID5. One was marked as faulty over night. I know that there
are other than fatal faults, so from habit in the PC-World, I just re-added
that disk (forced a rebuild, I can't recall the precise thing I did in
SST). If it really had a (media related) problem, rebuild would have kicked
it out again.

Rebuild went without any problems. That particular disk hasn't been

conspicuous for months now.

(From the beginning, there's a solid backup strategy in place for that

machine, involving monthly save 21's, and daily savechgobj to an
automatically created iso image being ftp'd to a backup server afterwards.
IFS isn't used beyond what was installed there through the OS itself.)

This outcome matches with my decades old experiences with PC servers

(not no-name crap, I'm talking about HPE and IBM, for example) running
Linux. I describe that as SCSI- (1990's, early 2000's) and today,
SAS-Hiccups, from the apparent lack of something being broken. RAID logic
doesn't get answer from the drive in a timely manner and declares it as
faulty. A lot of kernel log entries, but no clear culprit. Happens once
every one or two years per machine, depending on I/O load.

Just saying. Your mileage may vary.

:wq! PoC

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