We help IT Professionals succeed at work.

unrecoverable media Errors on raid array

Heres the scenario:
we have a client who is running a raid 10 array. 4 drives, all identicle. we are going to call them drive 1-4. 1 and 2 are together and 3 and 4 are together. drive 4 goes down. we order a replacement. drive 3 the other in the series starts reporting media errors. we swap 4 out. the raid array rebuilds, status now optimal. now 3 and 4 are reporting media errors, so we do a consistancy check which results in hundreds of uncorrectable errors. what are my options here? i have a second spare so i can swap out drive 3 if needed, but i cannot create a backup because the backups keep failing due to media errors. I'm also wondering, if i swap out drive 3, wont i just get the same media errors because it will write them from drive 4? am i in a loop that i cannot get out of?
Comment
Watch Question

Most Valuable Expert 2015

Commented:
Are you using Consumer Grade Disks in a RAID setup? Replace them with server grade Disks. Consumer disks aren't built for this.

Author

Commented:
they are server grade disks
Most Valuable Expert 2015

Commented:
Usually those that you get if you order them directly from your server manufacturer. For example if you have a server from HP or Dell and you order the disks from them for that server, you'll get enterprise grade disks. If you want to save money and get disks from 3rd parties, you'll likely get consumer disks that aren't suitable to run in a RAID array.
Distinguished Expert 2019
Commented:
Restore from backup is the only way to be sure that the data is correct. Errors on two disks at once aren't that common but in effect that's what you've got.

Author

Commented:
Andy-
so if we swap the drives (not at the same time)  we are just going to rebuild the errors correct?

Author

Commented:
we are going to go from a backup and see how it goes. thanks for all the input!