I used option #3 having never setup a Linux server on SAN before and had (and continue to have) zero problems once I figured out how to resolve the pathing. I am using HP BL460c blade servers with the QLogic 2432 4GB HBAs... Read the RedHat doc on Multipath:
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.2/html/DM_Mu ltipath/index.html If you use the RedHat drivers, you will see multiple paths if you have them. Another issue is the type of LUN presented by your SAN. When our SAN person first presented the LUNS, they were set to the wrong type and we saw 8 paths for each disk! In my current (non-prod) setup, I have one HBA connected to a SAN switch in a 2-switch fabric where each switch is direct-attached to the storage. There are 2 paths and when I connect my second HBA, I will have 4 paths... Kevin -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Corey Kovacs Sent: Monday, August 25, 2008 10:49 AM To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: Re: [rhelv5-list] RHEL5 - QLA2400 - HP EVA8100 I have a similar configuration using DL360's. So far it's worked great. THere are basically three options that I'll consider. 1. HP branded qlogic drivers setup for driver based failover which coalesces the device paths into a single path. 2. HP bradned qlogic drivers used along with device-mapper-multipath. 3. RedHat supported drivers used along with device-mapper-multipath. Yeah there are a few other options but I think these are the best. Personally, I use option 2. HP has some docs outlining the setup of the multipath.conf file and other details which is worth a look. I don't have a link sorry to say. This config responds well to everything I can toss at it, pulling cables, disabling switchports etc. The FC cards I use are the FC2242SR/DC (HP part#) 4Gbit dual port Can you share more details on your config? -Corey On Tue, Aug 26, 2008 at 4:29 PM, Thomas Widhalm <[EMAIL PROTECTED]> wrote: > Hi List, > > We frequently have problems connecting RHEL to our HP SAN. > > I already tried with support but got different answers any time I asked. > :-( > > So, what are your experiences? We want to start a new server with the > followin setup: > > * HP DL380 Server > * 2 QL2400 HBAs (HP branded) > * HP EVA8100 > > What driver should I use? There is the built-in from RedHat, one from > QLogic and one from HP. Either of them got us into trouble, so what do > you suggest to use? > > Or did you get better results by using different HBAs? We would even buy > new ones, if that could fix our problems. > > To make it even worse, we don't have reproducable errors, but all kinds > of problems. HBAs don't see presented disks (sometimes all of them, > sometimes just some of them), Failover won't work, OS sees disks > multiple times (one for each path, one for each controller - it > differs), OS won't boot because it tells us, the HBAs are just speaking > rubbish, etc. > > So, could you give us some of your experiences? > > Thanks a lot, > Thomas > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list > _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
