this post was submitted on 03 Sep 2023
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Everything ZFS

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A community for the ZFS filesystem.

ZFS is an opensource COW filesystem used by enterprise and serious homelabbers for it's data safety and extensive feature set.

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How can I best back up a ZFS volume to a USB hard drive? (lemmygrad.ml)
submitted 1 year ago by [email protected] to c/zfs
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(I feel like I've violated plenty of common-sense stuff while learning ZFS. If so, you can let me have it in the comments.)

I have a large RAID-Z1 array that I back up to a USB 3.0 hard drive. I'd also like to maintain zfs-auto-snapshot's snapshots as well. I've been doing a zfs send MyArray | zfs recv Backup and it's been working pretty well; however, once in a while, the array will become suspended due to an I/O error, and I'll either need to reboot, or rarely, destroy the backup disk and re-copy everything.

This seems like I'm doing something wrong, so I'd like to know: what is the best way to back up a ZFS array to a single portable disk?

I would prefer a portable backup solution like backing up to a single USB hard drive (preferably so I can buy two and keep one somewhere secure), but I'm open to getting a small NAS and zfs sending over a network.

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[–] [email protected] 2 points 1 year ago

Anything on dmesg?

That setup sounds pretty reasonable, my guess would be the USB drive craps itself on high IO on it going by the symptoms. Does it happen if it's not formatted as ZFS too?