This applies to Venice Servers, Fileservers, StorNext MDS/MDCs with RHEL 6.2 using QLogic Fibre Channel host adapters. Servers with ATTO Fibre Channel does not apply here, see separate document.
Need a RHEL 6.x install USB, mount it and set it up as a repository, use yum install to install the device-mapper-multipath.
Newer RHEL versions might already have this installed, do this to check
# chkconfig | grep -i multi multipathd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
To identify what Fibre Channel cards are installed (QLogic shown here)
# lspci | grep -i fibre 84:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02) 84:00.1 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)
This procedure tested on a RHEL 6.2 Venice Server, multipath install using a RHEL 6.6 server install USB.
Setup the REHL 6.6 USB drive as a repository, this is where yum install will get the packages and dependencies from, here is how to it.
Insert the USB stick, it should auto mount and look something like this
# df -h /dev/sdd1 29G 3.7G 26G 13% /media/RHEL-6_6 SE,
In it there is a
media.repo file, copy and rename it to
/etc/yum.repos.d/RHEL66_media.repo, then add to the last line "baseurl" to point to the path of the USB.
# cat /etc/yum.repos.d/RHEL66_media.repo [InstallMedia] name=Red Hat Enterprise Linux 6.6 mediaid=1411733344.627228 metadata_expire=-1 gpgcheck=0 cost=500 baseurl = file:///media/"RHEL-6_6 SE"
Might need to do this to clean up any old yum cache
yum clean all
Or cleanup / rename existing repo files in
/etc/yum.repos.d that might be pointing to non-existing paths which could cause yum to install to not complete.
yum install device-mapper-multipath
After the install these and other commands will be available to control / manage multipathing.
/etc/multipath.conf as required
Additional relevant link
DDN multipath settings