this post was submitted on 01 Sep 2023
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ELI5: a tool to check my disks while mounted? (lemmy.world)
submitted 1 year ago by PlutoniumAcid@lemmy.world to c/linux@lemmy.world
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On Windows, we've had the defrag tool and others, that happily works on a drive even while it is in use, even the OS disk.

On Linux, I know of the fsck command but that requires the drive in question to be unmounted. Not great when you want to check a running server. I do not want to stop my server and boot it from USB, just to run a disk check. I can't imagine that's what the data centers are doing, either!

Surely some Linux tool exists that can do some basic checks on a running system?

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[–] nomecks@lemmy.world 2 points 1 year ago* (last edited 1 year ago) (1 children)

Nearly all systems have some sort of background error checking which periodically reads all data and validates it hasn't changed. They also watch for SMART errors and pre-fail disks before they die entirely.

They use all forms of RAID (Netapp is a weird dual stripe RAID 4, for example) and Erasure coding primarily.

[–] teft@startrek.website 0 points 1 year ago (1 children)

How does that invalidate anything I said?

[–] Sethayy@sh.itjust.works 1 points 1 year ago

Dude I think this is a more you ain't smart enough to know that youre not smart... just take the L