"sleep better at night"

You nailed my issue spot on.

On Wed, Feb 26, 2014 at 9:44 AM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

Fought a similar situation with a 520 some time back. Problem was the
disk backplane. Cheapest part in the entire setup too. CE was going nuts
and had swapped the RAID card and many drives. Swapped out the backplane
and problem went away. Worth a look.

Those speaking about your drives being too old and you're living on
borrowed time and all? I'm not buying it. There are 10s of thousands of
those old disks out there spinning that have been going for years and
years and years. Remember MTBF is MEAN it does NOT mean that once you're
past that number your drive is due to fail.

Frankie for example is running on 6718s which have been spinning for way
over a decade and even with 45 drives fails a couple a year.

Would I configure hot spare if I could? Don't be silly, of course I
would! Raid 6? If I could afford the performance penalty then yes that
would be better still. Raid 6 with hot spare? Again if you have the
space and can handle the performance why not sleep better at night.

- Larry "DrFranken" Bolhuis


On 2/25/2014 6:39 PM, Jeff Crosby wrote:


System i 520 V7R1
Up to date on PTFS

System unit has 8 4326 drives Raid 5.
Expansion unit has 8 4326 drives Raid 5.

Since September, we've had 5 drive failures:

2013-09-23 DD003
2013-12-18 DD005
2014-02-14 DD004
2014-02-22 DD003
2014-02-25 DD001

All have been in the system unit. DD003 twice. Note that 3 of the
failures are in the last 11 days.

The one that just happened tonight was while bringing up the system after
replacing the internal 5755 tape drive. To add insult to injury, the
system is not recognizing the tape drive, so when the Raid 5 is done
rebuilding we get to start over with the tape drive.

What's causing these drives to fail? Each drive having an isue? Or
something else in the system?

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