[ksh93-integration-discuss] Periodic ZFS disk accesses by ksh93... / was: Re: [dtrace-discuss] [zfs-discuss] periodic ZFS disk accesses

[Roland Mainz]

Bill Shannon wrote:
> Jonathan Edwards wrote:
> > On Mar 1, 2008, at 4:14 PM, Bill Shannon wrote:
> >> Ok, that's much better!  At least I'm getting output when I touch files
> >> on zfs.  However, even though zpool iostat is reporting activity, the
> >> above program isn't showing any file accesses when the system is idle.
> >>
> >> Any ideas?
> >
> > assuming that you're running an interval (ie: zpool iostat -v 5) and
> > skipping past the initial summary .. you know it's not file read/write
> > activity .. you might want to check other vop calls .. eg:
> > http://blogs.sun.com/erickustarz/resource/zvop_times_fsid.d
> >
> > to see what's happening .. scrubs or silvering perhaps?
> 
> I ended up combining a few programs (cut & paste programming without
> really understanding what I was doing!) and ended up with a program
> that traces all the zfs_* entry points.  Based on the data I'm getting
> from that, correlated with the zpool iostat output, it appears that
> the culprit is ksh93!  It seems that ksh93 is doing a setattr call of
> some sort on the .history file.

What's the exact filename and how often are the accesses ? Is this an
interactive shell or is this a script (an interactive shell session will
do periodical lookups for things like the MAIL*-variables (see ksh(1)
and ksh93(1) manual pages) while scripts may do random stuff as intended
by the script's author(s)) ?
And how does the output of $ set # look like ?

----

Bye,
Roland

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