Re: consider dropping defrag of journals on btrfs

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Phillip Susi wrote on 11/02/2021 16:29:

Colin Guthrie writes:

Are those journal files suffixed with a ~. Only ~ suffixed journals
represent a dirty journal file (i.e. from an unexpected shutdown).

Nope.

Journals rotate for other reason too (e.g. user request, overall space
requirements etc.) which might explain this wasted space?

I've made no requests to rotate and config is default, which afaics
means only rotate when the log hits max size of 128MB.  Thus I wouldn't
expect to really see any holes in the log, especially in the middle.

I think the defaults are more complex than just "each journal file can grow to 128M" no?

I mean there is SystemMaxUse= which defaults to 10% of the partition on which journal files live (this is for all journal files, not just the SystemMaxFileSize= which refers to just one file).

The default semantics are described in man journald.conf(5)

Again, could be a red herring, so just my first thought.

Col



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Colin Guthrie
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http://colin.guthr.ie/

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