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The original was posted on /r/sysadmin by /u/sageRJ on 2024-01-21 16:08:18+00:00.
Trying to determine a good frequency to be performing consistency checks. We have quite a few storage servers and the LSI MegaRaid cards are configured by default to perform a patrol read and consistency check once a week. If these arrays were of a smaller size, I’d just leave the default schedules alone. My worry is that due to the size, and therefore time it takes to compete, it’s doing more harm than good.
Each server has 46 18TB hard drives spread across two RAID6 arrays, each totaling 327TB. The patrol reads take 1-2 days and the consistency checks take 3-4 days to complete. It’s CCTV storage, so they’re being written to close to 24/7 if that matters. Basically, the arrays are spending a majority of the time checking themselves. I’d like to switch the consistency checks over to once a month, and was looking for some insight as to whether or not that’s a good idea.
I don’t have a lot of experience with hardware raid. And realize the answer is probably that it depends on a lot of things. But just in case, I wanted to make sure there wasn’t some general consensus on this. Like that it should absolutely be doing the check at least once a week. Or no, once a month is completely fine.