Thanks Tore and Christophe. Unless someone has something for DDN, I'll have to roll my own (and share, of course.) On a somewhat related note - do you know if there a concise description of the existing prio's - outside of what's in the /* */'s? Thanks- -Mike ----- Original Message ---- From: Tore Anderson <tore@xxxxxxxxx> To: device-mapper development <dm-devel@xxxxxxxxxx> Sent: Thursday, September 13, 2007 3:33:11 AM Subject: Re: defining paths with DDN 8500 * Mike White > I'm working with the multipathing package and a DDN 8500. I've been > able to successfully configure failover and failback. The system is > configured as such: > qla_port_1 ---- ctrl A port 4 ---- LUN 3 (LUN 7) > qla_port_2 ---- ctrl B port 4 ---- LUN 7 (LUN 3) > > Where LUN 3 is on a dedicated port to qla_port_1 and qla_port_2 is > dedicated to LUN 7. > > The problem that I'm having is all the traffic is going through > qla_port_1, qla_port_2 appears to be sitting idle until a failover. > > To compensate, I've been using dmsetup to force the qla_port_2 ---- > LUN 7 path. > > Is there a better way than using dmsetup to do this? multipath isn't > an option, as it negatively impacts performance. Sounds like you're in need of a prio_callout. I'm not familiar with your hardware so I don't know if there's already one available, if not, make a simple script that for example prints "2" for the paths you want to prefer and "1" for the ones you want to use as backups. Then set path_grouping_policy to "failover". You might also want to set failback to "immediate". Regards -- Tore Anderson -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
