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ReadyNAS Ultra 4 dead
Hi,
my ReadyNAS Ultra 4 which i use as a backup for my primary NAS was showing increasing SMART errors on disk 4 since some weeks... As i was about to leave for vacation, it was "only" a backup system and the failing disk was from a different schedule as the other 3 unfortunately i decided to wait with the replacement...
Now I wanted to replace the disk (the Ultra was powered off for some days), just to find out disk 2 is no also reported as "dead", although i never received any SMART errors from this drive... It seems this drive just "vanished" into somewhere :(
I'm going to check internal cabling and such tomorrow, perhaps also test the drives with vendor tools on PC (already tried unplug / clean the little bit of dust / replug while powered off) and such... But the question that came to my mind is this: If i were able to make a copy of one of the two drives on a pc or other system, would i be able to plug this copy back into the NAS and it would be recognized ?
Any other hints what i could do to get #2 working again, i guess #4 is really dead as it was complaining for long...
Thx,
Max
7 Replies
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I would start with running disk diags on the drives in a PC (lifeguard for western digital, seatools for seagate). Label the drives of course.
After that - you can contact Netgear about a recovery contract. They might be able to remount the volume without too much effort.
You could also try cloning either drive 2 or drive 4.
Hello Max_1968,
If you haven't removed the disks yet, please download RAIDar 6.0 and install. This will give you an option to download the logs.
Regards,
Thanks both,
JennC - I have downloaded the logs before i posted here, basically SMART logs for all disks except #4 were fine, and my volume was dead due to double disk failure. I didnt find anything about what happened to #2, but didnt look in detail
StephenB - I followed your proposal, shut down the NAS, took out all disks, numbered them and run them through Seatools. Results as follows:
- Disk #1 - SMART Test - PASS
- Disk #1 - Short Test - PASS
- Disk #2 - Did neither show up in BIOS nor (obviously) in Seatools
- Disk #3 - SMART Test - PASS
- Disk #3 - Short Test - PASS
- Disk #4 - SMART Test - PASS (this surprised me as the Ultra reported it as failed due too to many SMART errors)
- Disk #4 - Long Test - FAIL right at the start
I then did a "full repair" with Seatools on disk #4, followed by another long test on it - This time result was PASS
So it seems now I have the following situation:
- Disk #1 OK
- Disk #2 FAIL
- DIsk #3 OK
- Disk #4 seems OK from a PC perspective, but might either fail right away in the ReadyNAS or again after a short period of time, not tried yet in NAS after repair
(BTW, these are Seagate ST3000DM001 drives about 2.5 years old - I never liked them, but I got the Ultra with them at a very reasonable price and thought for a backup system they are OK...)
My plan now is to clone disk #4 on the PC to the one replacement disk i already have (same type), hopefully get the Ultra and the volume up again, and then replace all disks one by one with 4 TB WD red drives starting with disk #2 to regain redundancy asap. I'd also like to figure out what happened to disk #2, but that has no importance now...
Does that sound like a good plan, any other recommendations ?
Thx,
Max
Max_1968 wrote:
I'd also like to figure out what happened to disk #2, but that has no importance now...
About 35% of all disks fail with no warning (no SMART alerts, etc).
Max_1968 wrote:
My plan now is to clone disk #4 on the PC to the one replacement disk i already have (same type), hopefully get the Ultra and the volume up again, and then replace all disks one by one with 4 TB WD red drives starting with disk #2 to regain redundancy asap.
Sounds right. I agree that cloning drive 4 makes sense, the "repair" facilities in the diags reallocate the bad sectors, but really don't repair anything. If the clone doesn't work you might need a recovery contract (or maybe per-incident support) with Netgear.
If it does work, then back up what you can before you add the WD Red. Rebuilding the array will stress the remaining drives.
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