On Thu, Dec 22, 2005 at 09:22:10PM -0600, Jeffry R. Abramson wrote: > On Tue, 20 Dec 2005 17:57:30 +0000, John Hearns > <[log in to unmask]> wrote: > > > > >I've set up LinuxHA and high availability NFS, and would prefer to use a > >dual-port SCSI array for this, or a SAN setup. > >Remember to mirror the lock files between the two systems also. > > > >I've used DRBD, but would advise monitoring if it is working, ie. if it > >fails on the recipinet machine the mirror will be out of sync and you > >need to restart it. > > Speaking of SAN's, has anyone gotten the multipath feature in SL42 to work? > We have an IBM blade equipped with a dual-port Qlogic controller connected > through two independent fabrics to a DS400/Adaptec array with a dual-port > controller. fdisk -l shows two paths to every logical array, ie. each disk > shows up twice. You should be seeing more than that, you have at least four paths (2xHBA ports x 2xcontroller ports). > The instructions make it look easy (comment everything out > from /etc/multipath.conf, start up multipathd and away you go). Running > multipath -v2 -l shows nothing. multipath -v3 shows that it sees all of the > devices but I don't know how to decipher where it is going wrong (I'd attach > the output but I'm typing this from home). Ideas? -- Jeff Use multipath -F and try again. Other than that check with scsi_id that the paths are to the same device, e.g. # for x in sdb sdc sdd sde; do /sbin/scsi_id -g -u -s /block/$x; done 3600508b4000106f30006300000240000 3600508b4000106f30006300000240000 3600508b4000106f30006300000240000 3600508b4000106f30006300000240000 That's what multipath does, too, to construct the multipath maps. -- Axel.Thimm at ATrpms.net