Harddisks falling offline for unknown reason

Solution 1:

We're missing information here. You're suggesting that you have 24-45 disks per server in this storage setup.

• Which specific controller(s) are you using?
• Due to the number of disks, you may have some drives in an external enclosure. Please provide the make/model of the external drive enclosure in use.
• What specific drive models are you using? Are all of the disks desktop-grade drives?
• What filesystem are you using?
• Describe the disk and RAID layout.
• Was this always a problem or did it develop over time?
• is Supermicro involved anywhere in this setup?

Depending on the enclosure setup, you may be running into SATA timeouts or bus errors. This can have an ill effect on all of the drives attached to the controller.

Another issue could be poor SAS/SATA link negotiation. I've certainly experienced this on some SAS expanders when 1.5Gbps and 6.0Gbps drives are mixed on the same board.

Please provide more information.