I hate to say it, because iSCSI is cool as
hell and ‘just works’, but you’re better off just using NFS
if you can get a license… It ain’t cheap tho. And FWIW, iSCSI
could be faster than NFS, NFS is likely just as fast as iSCSI or faster in some
cases.
Utilizing the lun create –b (as in
your example below), re-mounting that newly exposed iSCSI LUN as a new device
on LINUX then performing the backup is definitely the right idea. This is the ‘norm’
for most NetApp iSCSI environments (Exchange, SQL, etc).
Glenn
From: owner-toasters@mathworks.com
[mailto:owner-toasters@mathworks.com] On
Behalf Of David L. Lambert
Sent: Wednesday, November 12, 2008
4:29 PM
To: toasters@mathworks.com
Subject: RE: Mounting read-only
snapshots using open-iscsi?
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)
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?