Date: Tue, 24 May 2011 00:09:21 +0300 From: Toomas Aas <toomas.aas@raad.tartu.ee> To: freebsd-scsi@freebsd.org Subject: iSCSI multipathing Message-ID: <20110524000921.10862o7lpz7ezx8g@webmail.raad.tartu.ee>
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Now that I have basic iSCSI connection working with FreeBSD 7.3 (thanks Danny!) I'm looking at multipathing. My server has two dedicated interfaces for iSCSI traffic, each connected to a separate gigabit switch, and each switch in turn connected to a separate interface on my iSCSI target (EMC Celerra NX4). I can bring up either of the two connections with iscontrol, mount the partition from the target and use it to my heart's content. But how should I handle multipathing? My initial thought was to bring up both connections simultaneously and set up gmultipath across da0 and da1. However, as soon as I bring up both connections, it seems that they begin to constantly disconnecting and reconnecting: # iscontrol -c /etc/iscsi.conf -n celerra_path1 iscontrol[14277]: running iscontrol[14277]: (pass0:iscsi0:0:0:2): tagged openings now 0 # iscontrol -c /etc/iscsi.conf -n celerra_path2 iscontrol[14277]: trapped signal 30 trapped signal 30 iscontrol: supervise going down iscontrol[14277]: sess flags=2000040d iscontrol[14277]: Reconnect iscontrol[14309]: running iscontrol[14309]: (pass1:iscsi1:0:0:2): tagged openings now 0 iscontrol[14309]: trapped signal 30 trapped signal 30 iscontrol: supervise going down iscontrol[14309]: sess flags=2000040d iscontrol[14309]: Reconnect iscontrol[14277]: trapped signal 30 trapped signal 30 iscontrol: supervise going down iscontrol[14277]: sess flags=2000040d iscontrol[14277]: Reconnect iscontrol[14309]: trapped signal 30 trapped signal 30 iscontrol: supervise going down iscontrol[14309]: sess flags=2000040d iscontrol[14309]: Reconnect iscontrol[14277]: trapped signal 30 trapped signal 30 iscontrol: supervise going down iscontrol[14277]: sess flags=2000040d iscontrol[14277]: Reconnect Is there a way to avoid this constant disconnect/reconnect? How are other people handling multipathing on iSCSI? -- Toomas Aas
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