Backup strategy for large mailbox stores

Michael Bacon baconm at
Tue Feb 16 11:32:50 EST 2010

For those of you doing ZFS, what do you use to back up the data after a zfs 
snapshot?  We're currently on UFS, and would love to go to ZFS, but haven't 
figured out how to replace ufsdump in our backup strategy.

Michael Bacon
ITS Messaging
UNC Chapel Hill

--On February 16, 2010 9:49:07 AM +0100 Eric Luyten <Eric.Luyten at> 

> On Tue, February 16, 2010 12:34 am, John Madden wrote:
>> Out of curiousity, how good is zfs with full fs scans when running in
>> the 100-million file count range?  What do you see in terms of aggregate
>> MB/s throughput?
> ZFS is awesome.
> We have a ZFS pool composed of nine LUNs on an iSCSI-connected (2 x 1
> Gbps) EMC Celerra. All disks are 7200 rpm S-ATA.
> On our previous storage system (FC-AL connected StorageTek with 15k and
> 10k rpm FC disks) I was able to run more finds/dumps/... in parallel
> without impacting mail service performance or message delivery rate.
> Even now I can pull close to 100 MB/s from the mail section of the storage
> subsystem without users noticing.   48 GB RAM on the mailserver sure
> helps, plenty of ARC :-)
> Eric.
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