ZFS for Cyrus IMAP storage

Gary Mills mills at cc.umanitoba.ca
Sat May 5 15:47:37 EDT 2007

On Sat, May 05, 2007 at 10:14:07AM -0700, Vincent Fox wrote:
> Gary Mills wrote:
> >There was a question earlier regarding ZFS for Cyrus IMAP storage.  We
> >recently converted to that filesystem here.  I'm extremely pleased
> >with it.  Our server has about 30,000 users with over 200,000
> >mailboxes.  It peaks at about 1900 IMAP sessions.  It currently has 1
> >TB of storage with about 300 GB in use.  The server is a Sun T2000
> >with 16 GB of memory, running Solaris 10.  It uses iSCSI to provide two
> >500 GB devices from our Netapp filer.  Disk redundancy is all on the
> >Netapp because it's currently superior to that provided by ZFS.
> Our T2000 have 8 GB for the cluster we are building here at University 
> of California Davis.
> Would you expect we will be having to upgrade RAM, or is it just gravy?

I really don't know.  IMAP sessions need lots of memory.  ZFS will use
all it can get for its ARC cache.  For a one-off server, I find it
cheaper to overdesign it than to devote a lot of time to full load

-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-

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