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BTRFS maintenance with SSD's (beehaw.org)

submitted 1 year ago by VE3VVS@beehaw.org to c/foss@beehaw.org

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I have 3TB as the main active storage on my workstation, across two SSD's, now I know that defraging and SSD has no point, in fact just adds additional wear and tear. I was wondering should I be doing any maintenance to my file systems /root /home /.snapshot, on the SSD's. they have been working for three years now with no problems or errors but just wondered what others thought

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[–] khalil@beehaw.org 1 points 1 year ago

I'd mostly focus on scrub, but I'll also recommend that you keep an eye on your unallocated blocks, running out of them can get you into out-of-space situations that are non-trivial to fix. My general recommendation is about 5G per device, that should give it enough breathing room that it won't -ENOSPC on most workloads. Also, please note that unallocated space is a subset of free space, that is, all unallocated space is free space but the inverse isn't true.

Getting more unallocated space is as easy as running a balance with a filter, say "btrfs balance start -dusage=10 /mountpoint". Just don't balance metadata unless you want to convert it.

Regarding defrag, I still defrag databases, system journal files, etc, even on SSDs. Those workloads tend to cause a lot of fragmentation that can impact your performance (try reading your journalctl logs before and after a defrag, as an example).