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Re: [zfs-discuss] fdsync(5, FSYNC) problem and ZFS

Subject: Re: [zfs-discuss] fdsync(5, FSYNC) problem and ZFS
From: "Dana H. Myers"
Date: Sun, 18 Jun 2006 10:36:18 -0700
Daniel Rock wrote:
> Sean Meighan schrieb:
>> The box runs less than 20% load. Everything has been working perfectly
>> until two days ago, now it can take 10 minutes to exit from vi. The
>> following truss shows that the 3 line file that is sitting on the ZFS
>> volume (/archives) took almost 15 minutes in fdsync.
> /me have similar observations. With virtual no other activity on the box
> exiting from vi (:wq) sometimes takes 10-60 seconds. Trussing the
> process always shows vi is waiting in fdsync(). This happened on at
> least two different machines:
> - Sun E3500 with ZFS on A5200 disks (snv_37, almost all of the time large
>   delay (10-60 secs.) when exiting from vi)
> - Solaris/amd64 with ZFS on SATA disks (snv_39, but only few delays,
> usually
>   not longer than 10 secs.)

I think you may be tripping over:

CR 6413510 zfs: writing to ZFS filesystem slows down fsync() on other files in 
the same FS

(see http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6413510)

It is apparently because ZFS currently syncs the entire filesystem when
asked to sync just one file.

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