On 2020-06-13 12:56, Todd C. Miller wrote:
> 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.

Thanks for the correction!  The really embarrassing thing is I even
checked the man page, but started from the incorrect assumption that
"async" and "sync" were the only two choices and read what I expected,
not what is actually on the page. 


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