Ok. So I just realized that if I want to try the new RDAC support, then I have to install the new beta kernel as well. It includes the RDAC hardware handler. I'm under serious pressure to get my cluster up and running asap and I don't think I want to be installing a bunch of beta packages onto my production servers. Especially kernels. So this might mean not exploring the RDAC solution. Redhat's docs say that they support a Sun OpenStorage D280 and our Sun rep says the 6140 is essentially identical. If that's the case, what am I don't wrong? cheers, --james -----Original Message----- From: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] On Behalf Of James Fillman Sent: Monday, September 17, 2007 11:18 AM To: device-mapper development Subject: RE: path priorities on Sun's 6140 Thanks for getting back to me Tore, Hannes, and Eckebrecht. I've downloaded and installed the latest device-mapper-multipath rpm from Redhat. It's still only beta but I figured I give it a try. I see that there's an rdac checker in there but I don't see a hardware handler. Is anyone running RHEL against a Sun 6140 SAN? Trying to get a definitive answer from Redhat on their support for this SAN has been impossible. The mailing list hasn't been too helpful either. If RDAC is the way to go 1. do I need to use a hardware handler? There doesn't seem to be one in their latest RPM. 2. What Host type do I chose on the SAN? 3. What should the path grouping policy by? Tore: you mentioned using group_by_serial 4. What should the path checker be? I'm going to take a stab at it and guess this, can anyone confirm?: /etc/multipath.conf defaults { udev_dir /dev polling_interval 10 selector "round-robin 0" path_grouping_policy group_by_serial getuid_callout "/sbin/scsi_id -g -u -s /block/%n" prio_callout "/sbin/mpath_prio_rdac /dev/%n" path_checker tur rr_min_io 100 rr_weight uniform failback immediate no_path_retry queue user_friendly_name yes } devices { device { vendor "SUN" product "CSM200_R" path_grouping_policy group_by_prio path_checker tur prio_callout "/sbin/mpath_prio_rdac /dev/%n" getuid_callout "/sbin/scsi_id -g -u -s /block/%n" rr_weight uniform rr_min_io 1000 features "1 queue_if_no_path" } } cheers, --james -- 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
