ReadyNAS Ultra 4 dead

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