On Sat, 13 Jun 2020 12:12:05 -0400, Nick Holland wrote:

> On 2020-06-11 12:07, Strahil Nikolov wrote:
> > I always thought that 'sync' mount option  is enough  to avoid
> > corruption of the FS. Am I just "fooling" myself  ?
> As "sync" is the default...yes, I think you are.

Actually, by default only metadata is written synchronously.  The
"sync" mount option causes data to be written synchronously too.
Of course, the disk *itself* has a cache so even with synchronous
writes you can't be sure the data has actually made it to the platter.

So yes, I agree that sync mounts are not really enough to help here.
You are probably correct that softdep is better for this kind of
thing since it does a better job of keeping the filesystem in a
consistent state, at the cost of missing data when there is an
unclean shutdown.  In theory, the on-device cache can still cause
issues when you lose power though.

 - todd

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