On May 11, 2010, at 10:17 PM, schickb wrote:
> I'm looking for input on building an HA configuration for ZFS. I've read the
> FAQ and understand that the standard approach is to have a standby system
> with access to a shared pool that is imported during a failover.
>
> The problem is that we use ZFS for a specialized purpose that results in 10's
> of thousands of filesystems (mostly snapshots and clones). All versions of
> Solaris and OpenSolaris that we've tested take a long time (> hour) to import
> that many filesystems.
>
> I've read about replication through AVS, but that also seems require an
> import during failover. We'd need something closer to an active-active
> configuration (even if the second active is only modified through
> replication). Or some way to greatly speedup imports.
>
> Any suggestions?
The import is fast, but two other operations occur during import that will
affect boot time:
+ for each volume (zvol) and its snapshots, a device tree entry is
made in /devices
+ for each NFS share, the file system is (NFS) exported
When you get into the thousands of datasets and snapshots range, this
takes some time. Several RFEs have been implemented over the past few
years to help improve this.
NB. Running in a VM doesn't improve the share or device enumeration time.
-- richard
--
ZFS storage and performance consulting at http://www.RichardElling.com
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