zfs discuss - Aug 2006 - Can a zfs storage pool be imported readonly?

Hi,
   I''m new to ZFS so I was wondering if it is possible to concurrently
share a ZFS storage pool between two separate machines. I am currently
evaluating Sybase IQ
running on ZFS rather than raw devices(initial performance tests look very
promising) and need now to evaluate whether the IQ query server functionality
will work.

This simply means that the Query server will have readonly access to the data
(no lock manage required as far as I can tell), so that is why I would need to
import the storage pool readonly or at least without exporting it.

Any help would be appreciated and I will report my findings.

Regards

oab
 
 
This message posted from opensolaris.org

oab wrote:
> I''m new to ZFS so I was wondering if it is possible to
concurrently
> share a ZFS storage pool between two separate machines. I am currently
> evaluating Sybase IQ
> running on ZFS rather than raw devices(initial performance tests look
> very promising) and need now to evaluate whether the IQ query server
 > functionality will work.

Not today.  We are very early on in the process of defining a project to 
make ZFS a shared file system for Sun Cluster.  When this project is 
complete (no idea when that might be, yet, sorry), it will be possible 
to share a zpool among nodes of a cluster.

We have support for fail-over ZFS (HA-ZFS) in the next release of Sun 
Cluster, due out later this year.  That doesn''t provide concurrent 
access, but it does provide high availability.
> This simply means that the Query server will have readonly access to
> the data (no lock manage required as far as I can tell), so that is why
> I would need to import the storage pool readonly or at least without
> exporting it.
It''s conceivable that it might work if *all* the nodes imported the
pool
read-only, but that''s not tested and certainly not supported.
-- 
	--Ed
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oab wrote:
> Hi, I''m new to ZFS so I was wondering if it is possible to
> concurrently share a ZFS storage pool between two separate machines.
No.  You may be interested in this RFE:

4996041 want to directly access snapshots from multiple machines

--matt