zfs discuss - Oct 2009 - zpool is very slow

I created a raidz zpool and shares and now the OS is very slow.  I timed it and
I can get about eight seconds of use before I get ten seconds of a frozen
screen.  I can be doing anything or barely anything (moving the mouse an inch
side to side repeatedly.)  This makes the machine unusable.  If I detach the
SATA card that the raidz zpool is attached to everything is fine.  The slowdown
occurs regardless of the user that I login as (admin, reg user), and the speed
up occurs only when the SATA card is removed.  This leads me to believe that
something is going on with the zpool.  There are no files on the zpool (I
don''t have the patience for the constant freezing to copy files over to
the zpool.)

The zpool is 4TB in size.  I previously had the system up and running for a week
before I did something stupid and decided to start from scratch and reinstall
and recreate the zpool.

The "zpool status" command shows no errors with the zpool and iostat:
mediaz used 470k avail 5.44T read 0 write 0 bandwidth read 37 bandwidth write 44

How do I find what is accessing the zpool and stop it?

David
-- 
This message posted from opensolaris.org

David,

May be you can you the iosnoop of the dtrace toolkit:

http://www.solarisinternals.com/wiki/index.php/DTraceToolkit#Scripts

..Remco

David Stewart wrote:
> I created a raidz zpool and shares and now the OS is very slow.  I timed it
and I can get about eight seconds of use before I get ten seconds of a frozen
screen.  I can be doing anything or barely anything (moving the mouse an inch
side to side repeatedly.)  This makes the machine unusable.  If I detach the
SATA card that the raidz zpool is attached to everything is fine.  The slowdown
occurs regardless of the user that I login as (admin, reg user), and the speed
up occurs only when the SATA card is removed.  This leads me to believe that
something is going on with the zpool.  There are no files on the zpool (I
don''t have the patience for the constant freezing to copy files over to
the zpool.)
> 
> The zpool is 4TB in size.  I previously had the system up and running for a
week before I did something stupid and decided to start from scratch and
reinstall and recreate the zpool.
> 
> The "zpool status" command shows no errors with the zpool and
iostat:
> mediaz used 470k avail 5.44T read 0 write 0 bandwidth read 37 bandwidth
write 44
> 
> How do I find what is accessing the zpool and stop it?
> 
> David