Roch wrote:
Sean Meighan writes:
> The vi we were doing was a 2 line file. If you just vi a new file, add
> one line and exit it would take 15 minutes in fdsynch. On recommendation
> of a workaround we set
>
> set zfs:zil_disable=1
>
> after the reboot the fdsynch is now < 0.1 seconds. Now I have no idea if it was this setting or the fact that we went through a reboot. Whatever the root cause we are now back to a well behaved file system.
well behaved...In appearance only !
Maybe it's nice to validate hypothesis but you should not
run with this option set, ever., it disable O_DSYNC and
fsync() and I don't know what else.
Bad idea, bad.
Why is this option available then? (Yes, that's a loaded question.)
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