sync vs async vs zfs
quartz at sneakertech.com
Thu Sep 24 20:53:27 UTC 2015
> Very short answer…
OK, thanks. So far that lines up with what I thought I knew. I still
think I might be fuzzy on what constitutes an 'app' in this context
though, presumably you're also counting services like nfs, etc?
Basically, when considering just boring file copies, which things are or
are not async and when? Under what circumstances is sync actually used
in the real world?
> use a device which is much faster than the main zpool devices
1) A SLOG's only purpose is to reduce fragmentation and increase sync
speed, correct? Re: speed, using a SLOG that's the same speed as the
other drives in a pool is mostly pointless, right?
2) Async doesn't really care how your pool is constructed, and a SLOG is
really the only thing that seriously makes a difference for sync, correct?
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