Yep, I've put iSCSI LIFs on ifgrps plenty of times, more often than not actually. This way NFS/CIFS and iSCSI can share the same precious 10GbE physical ports and all can be optimally configured (just separate them with vlans. Please separate them with vlans). Less admin to build as well - one LIF per node is just fine, and you only need one session per node established from the host instead of two. But yes always, always use MPIO with iSCSI.

Peta

On 15 April 2015 at 21:05, tmac <tmacmd@gmail.com> wrote:

Found this:

There are two methods to achieve path redundancy if using iSCSI (RFC3720) in clustered Data ONTAP: by using ifgrps to aggregate more than one physical port in partnership with an LACP-enabled switch, or by configuring hosts to use MPIO over multiple distinct physical links. Both of these methods allow a storage controller and host to use aggregated bandwidth and both can survive the failure of one of the paths from host to storage controller. However, MPIO is already a requirement for using block storage with clustered Data ONTAP, and using MPIO has the further advantage of no additional switch configuration or port trunking configuration being required. Also, using an ifgrp for path management when using iSCSI is not supported, again, you will want to use MPIO with iSCSI. But, using an ifgrp as a port for an iSCSI LIF is supported.

--tmac

Tim McCarthy
Principal Consultant

On Wed, Apr 15, 2015 at 6:22 AM, tmac <tmacmd@gmail.com> wrote:
Actually, only makes sense for NFS/CIFS

Failover groups do not work with SAN protocols. cDOT will not even let you configure a failover group on an iSCSI of FCP LIF.

Also, not sure if you can put an iSCSI LIF on an ifgrp. (you probably can)

--tmac

Tim McCarthy
Principal Consultant

On Wed, Apr 15, 2015 at 5:46 AM, Martin <martin@leggatt.me.uk> wrote:
Thanks guys, really useful, made things a lot clearer.

John your comment "do ifgrps within a node and then failover-groups between
nodes. If one link goes down, traffic still stays local to the node. If the
node goes down, traffic migrates as expected. " makes sense for SMB/CIFS
environments (or I guess NFSv4).

Martin

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