Your system may be thinking it has an issue with the drive but it could be your controller, cable, or back plane.
I had to replace the drive back plane in a Power 5 520 once. Like you multiple drive failures;
Replaced controller, still had drive failures
Replaced cable, still had drive failures
Replaced back plane and no more failures.
Director of Information Services
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jeff Crosby
Sent: Tuesday, February 25, 2014 3:39 PM
To: Midrange Systems Technical Discussion
Subject: Hard drive failures
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:
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?