Hi Clint, My feeling is that the NIC on the server is not where most multipath happens. You could use bonding for 2 NICs to have a secondary NIC take over if the path from server NIC-1 gets disconnected.
On the other end is where multipath takes place. On a setup that I have, multipath logs in to 4 different paths on the SAN, and shows the paths with "multipath -l": xr (36006016025302300a2f50e7c0981de11) dm-10 DGC,RAID 1 [size=24G][features=1 queue_if_no_path][hwhandler=1 emc][rw] \_ round-robin 0 [prio=0][active] \_ 1:0:0:6 sdz 65:144 [active][undef] \_ 3:0:0:6 sdaa 65:160 [active][undef] \_ round-robin 0 [prio=0][enabled] \_ 2:0:0:6 sdab 65:176 [active][undef] \_ 4:0:0:6 sdac 65:192 [active][undef] Paul ----- Original Message ----- From: "Clint Dilks" <[email protected]> To: [email protected] Sent: Tuesday, January 12, 2010 9:09:09 PM (GMT-0600) America/Chicago Subject: Help with ISCSI SAN Hello Everyone I am wanting feed back from people familiar with Dell Equallogic ISCSI SANS. Our organization has just purchased a Dell Equallogic ISCSI SAN with all the equipment required to allow a host to have fully redundant paths to this SAN. We have also purchased PowerEdge Servers with Broadcom NetXtremeII Nics /ISCSI HBA's. On some of these servers we want to run Redhat Enterprise Linux 5.4 or CentOS 5.4 I can find documentation on using Software ISCSI initiators, but nothing on using Broadcom Hardware HBA's so I am assuming it is a case of go into the BIOS of the server put in the license key for the Hardware HBA and then another device that looks like a Nic will be present once RHEL or CentOS is installed. Is this correct ? If this is the case I am assuming I still use the open iscsi initiator tools to manage things ? To ensure redundancy each Linux host will have two nics going connected to the ISCSI network. And I am aware that I can use dmsetup / multipath to setup a redundant device but one thing that confuses me is that if the two nics (each connected to a separate switch) are on the same subnet (as Dell have instructed me to do) how can you guarantee that the two connections you see are using the appropriate redundant paths ? Or is this not really an issue ? Thank you for any thoughts or experiences that you can share related to a setup like this, and have a nice day :) _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
