On 19/10/2022 22:00, Reindl Harald wrote:
Am 19.10.22 um 21:30 schrieb Umang Agarwalla:
Hello all,
We run Linux RAID 10 in our production with 8 SAS HDDs 7200RPM.
We recently got to know from the application owners that the writes on
these machines get affected when there is one failed drive in this
RAID10 setup, but unfortunately we do not have much data around to
prove this and exactly replicate this in production.
Wanted to know from the people of this mailing list if they have ever
come across any such issues.
Theoretically as per my understanding a RAID10 with even a failed
drive should be able to handle all the production traffic without any
issues. Please let me know if my understanding of this is correct or
not.
"without any issue" is nonsense by common sense
No need for the sark. And why shouldn't it be "without any issue"?
Common sense is usually mistaken. And common sense says to me the exact
opposite - with a drive missing that's one fewer write, so if anything
it should be quicker.
Given that - on the system my brother was using - the ops guys didn't
notice their raid-6 was missing TWO drives, it seems like lost drives
aren't particularly noticeable by their absence ...
Okay, with a drive missing it's DANGEROUS, but it should not have any
noticeable impact on a production system until you replace the drive and
it's rebuilding.
Unfortunately, I don't know enough to say whether a missing drive would,
or should, impact performance.
Cheers,
Wol
