I got mounting a snapshot to work.  I needed to do “iscsiadm … --rescan”, following this hint:

http://www.mail-archive.com/open-iscsi@googlegroups.com/msg01072.html

We have not implemented this with an actual NetApp yet, so I have no idea whether performance will be acceptable;  but thanks to all for the advice.

--

David Lee Lambert

Software Developer, Precision Motor Transport Group, LLC

517-349-3011 x223 (work) … 586-873-8813 (cell)

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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of David L. Lambert
Sent: Wednesday, November 12, 2008 11:22 AM
To: toasters@mathworks.com
Subject: RE: Mounting read-only snapshots using open-iscsi?

[…]

However, as I said, we don’t have an NFS license; we’ve also heard that NFS performance is poorer than iSCSI performance.  My guess is that some commands like the following ought to work:

Filer> lun map /vol/vol1/luns/lun11_snapforback linux-host 3

Linux> iscsiadm -m discovery --interface eth0 -t st -p 10.10.10.23 --login

Linux> iscsiadm -m node --interface eth0 -p 10.10.10.23 --login

Linux> mount /dev/sde /mnt/lun11-snap

When I do that, though, the set of available SCSI disk devices on the Linux host doesn’t change.  Perhaps this is an open-iscsi limitation instead?