Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I am aware of the problem when using standard consumer-grade drives with RAID levels 5 and 6; if a drive takes too long trying to read and/or repair a bad sector, it will be dropped by a hardware RAID controller because the controller thinks the drive is dead.

ERC/TLER/CCTL is supposed to prevent this by halting the failed I/O attempt, informing the hardware RAID controller of the problem and allowing the bad sector to be rebuilt from parity data (in RAID 5 and RAID 6). In RAID 1, the exact same data is shared across all drives, and thus does not use parity data. I am not sure how this changes the rebuild process of the array.

Specifically, does using ERC/TLER/CCTL-capable drives provide any benefit for a RAID 1 configuration?

share|improve this question

1 Answer 1

up vote 1 down vote accepted

It provides the same advantage for RAID1 as for RAID5/6: A read from a sector with an error will be aborted in shorter time. Thus attempted read for that sector will not cause a long delay. This can be quite nice if that RAID1 holds your OS and the whole OS freezes as a result.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.