zfs discuss - Mar 2007 - How to interrupt a zpool scrub?

Dear all

Is there a way to stop a running scrub on a zfs pool? Same question applies to a
running resilver.
Both render our fileserver unusable due to massive CPU load so we''d
like to postpone them.

In the docs it says that resilvering and scrubbing survive a reboot, so I am not
even sure if a reboot would stop scrubbing or resilvering.

Any help greatly appreciated!

Cheers, Thomas
 
 
This message posted from opensolaris.org

Hi Thomas,

The man page for zpool has:

     zpool scrub [-s] pool ...

          Begins a scrub. The  scrub  examines  all  data  in  the
          specified  pools  to verify that it checksums correctly.
          For replicated (mirror or raidz) devices, ZFS  automati-
          cally  repairs  any  damage discovered during the scrub.
          The "zpool status" command reports the progress  of  the
          scrub  and summarizes the results of the scrub upon com-
          pletion.

	....
         Because  scrubbing  and  resilvering  are  I/O-intensive
          operations, ZFS only allows one at a time. If a scrub is
          already in progress,  the  "zpool  scrub"  command  ter-
          minates  it  and starts a new scrub. If a resilver is in
          progress, ZFS does not allow a scrub to be started until
          the resilver completes.

          -s  Stop scrubbing.

When run the status of the pool has:

  scrub: scrub stopped with 0 errors on Mon Mar  5 09:51:52 2007

as opposed to:

  scrub: scrub completed with 0 errors on Mon Mar  5 09:51:16 2007

Hope that helps,

pete

Thomas Werschlein wrote:
> Dear all
> 
> Is there a way to stop a running scrub on a zfs pool? Same question applies
to a running resilver.
> Both render our fileserver unusable due to massive CPU load so
we''d like to postpone them.
> 
> In the docs it says that resilvering and scrubbing survive a reboot, so I
am not even sure if a reboot would stop scrubbing or resilvering.
> 
> Any help greatly appreciated!
> 
> Cheers, Thomas
>  
>  
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

How embarrassing is that? Pete kindly pointed me to the man page where it
clearly states that I should use "zpool scrub [-s] pool". -s for
"Stop scrubbing". Sorry folks, I just looked in the Administration
guide where I couldn''t find it. But I am sure it''s in there,
too.
 
 
This message posted from opensolaris.org

zfs-discuss-bounces at opensolaris.org wrote on 03/05/2007 04:18:44 AM:
> How embarrassing is that? Pete kindly pointed me to the man page
> where it clearly states that I should use "zpool scrub [-s]
pool". -
> s for "Stop scrubbing". Sorry folks, I just looked in the
> Administration guide where I couldn''t find it. But I am sure
it''s in
> there, too.
Don''t feel too bad I missed it too... Robert Milkowski thankfully
directed
me to the man page.  =/

>
>
> This message posted from opensolaris.org
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> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
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