Stack behaves like a single switch w.r.t. port aggregation. You can do multi vif on stacked Cisco as well without problems.
С уважением / With best regards / Mit freundlichen Grüβen
--- Andrey Borzenkov Senior system engineer -----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Milazzo Giacomo Sent: Wednesday, March 12, 2008 8:33 PM To: Glenn Walker; Jon Hill; netapp.filer@gmail.com; toasters@mathworks.com Subject: R: iscsi, mpio of multiple connections with a single head
Don't know what kind of switches you're using but I can demonstrate :-) that I'm using on a 3020 with (and since 7.0.4) two multi vif vif'ed together with a single supervif on two different 3Com 3870 with stacking cable and LACP, ST and RST enabled on those ports. In other words e0a and e0c create vif_ac multi with the two nics plugged on different switch, e0b and e0d create a vif_bd multi plugged in the same manner and vif_ac and vif_bd create main_vif single... I've tested to unplug everything with crossing tests, to power off one of the two switches and so on...and with 3Com you can loose in certain condition, just 3 or 4 pings...
Maybe some trouble here cames out using Cisco switches that create always several nightmares to create the right teaming? :-) (with 3Com are a couple of click on the web gui).
Bye,
-----Messaggio originale----- Da: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] Per conto di Glenn Walker Inviato: lunedì 10 marzo 2008 23.26 A: Jon Hill; netapp.filer@gmail.com; toasters@mathworks.com Oggetto: RE: iscsi, mpio of multiple connections with a single head
You can't/shouldn't do multi-mode (active/active) VIFs across multiple switches - you can/should do single-mode (active/passive) VIFs across multiple switches. Is this perhaps the issue?
We're quickly moving away from iSCSI HBAs given QLogic's direction to abandon them (so we've heard), and their issues with networking stack on the cards.
Glenn
-----Original Message----- From: Jon Hill [mailto:JHill@jennison.com] Sent: Monday, March 10, 2008 9:43 AM To: Glenn Walker; netapp.filer@gmail.com; toasters@mathworks.com Subject: RE: iscsi, mpio of multiple connections with a single head
We started with VIFs in which each NIC was on a separate switch. After lots of performance issues we talked to NTAP support, who told us we shouldn't be using VIFs on separate switches for iSCSI. I don't remember the details of the case very well, but it seemed our options were to set up the VIF on a single switch, thus introducing a SPOF, or to give each NIC its own IP and rely on MPIO on the client side. We opted for the latter solution and it's worked well for us for about a year now. However, the multi-level VIF you describe sounds like it should work if you have the available NICs.
We put our client NICs on the same subnet too, but we use iSCSI HBAs rather than onboard NICs.
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Glenn Walker Sent: Sunday, March 09, 2008 7:27 PM To: netapp.filer@gmail.com; toasters@mathworks.com Subject: RE: iscsi, mpio of multiple connections with a single head
We've been using VIFs exclusively for iSCSI. Not using a VIF could be problematic if the switch were to fail.
Our typical deployment is multi-level vif: 2 active connections as multi-mode vif, 2 passive connections as multi-mode vif, aggregate the 4 links together as single-mode vif.
As for iSCSI on the host, two separate NICs with separate IPs (we put them both on the same network).
Glenn
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of netapp.filer@gmail.com Sent: Sunday, March 09, 2008 11:10 AM To: toasters@mathworks.com Subject: iscsi, mpio of multiple connections with a single head
Hi,
I was wondering what the opinions are regaring setting up iscsi and MPIO.
I have the following setup:
Windows 2003 host, two nics for iSCSI, MS iSCSI initiator, Snapdrive 5.0
Two Network switches
Netapp FAS3020 single head, with 2 nics for iSCSI (should I set this up as a vif?)
How should I set up the IP adresses on the host, should I use a single vif on the filer?
I have searched on the NOW site but there are no guides for this configuration, all config guides only discuss HA (Clustered filers) configurations -- View this message in context: http://www.nabble.com/iscsi%2C-mpio-of-multiple-connections-with-a-singl e-head-tp15919171p15919171.html Sent from the Network Appliance - Toasters mailing list archive at Nabble.com.