Also, if you have access to Oracle's Metalink, there's a very good document on there on how to configure multipathing for rhel 5 that I aways use as a reference. -----Original Message----- From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Eugene Vilensky Sent: Monday, 21 February 2011 7:13 a.m. To: General Red Hat Linux discussion list Subject: Re: Multipathing errors On Sun, Feb 20, 2011 at 10:40 AM, Paul Crittenden <paul.crittenden@xxxxxxxxxxx> wrote: > We are trying to set up multipathing RHEL 5.5 and are getting some errors. When I comment the 3 blacklist lines in the /etc/multipath.conf file and then run modprobe dm-multipath Most documentation recommend using the service command or executing /etc/init.d/multipathd in order to start/stop/restart the service. Regardless, the "blacklist lines" are just examples for you to craft your own as applicable to your machine configuration. >and turn on the multipathd daemon I am not seeing the mpath0 device being created in the /dev/mapper folder. What is "turn on the multipathd daemon" mean? Restart the service? Do you follow up with any additional commands to verify what your change accomplished? >Also, in the /dev/ directory I see sda, sda1, sdb, sdb1, sdc, sdc1, sdd, sdd1 devices. I have another server that I have set up multipathing on and there are only sda, sdb, sdc and sdd devices and the mpath0 device is created and multipathing is working fine on it. Your two systems are configured differently. You didn't mention it above, but what commands/outputs are you using to measure "working fine" and not "working fine" ? > When I reboot the server with the multipath daemon enabled and the device blacklist commands commented out, when it tries to then mount /dev/sda1 I get the error, /dev/sda1 already mounted or the mount point is busy. I then uncomment out the blacklist lines and everything is back to normal except I am still seeing the sda, sda1 etc. devices being created. The blacklists are there as /examples/ of how to craft your own in order to properly exclude non-multipath devices from the multipath daemon. You should probably start with this: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single /DM_Multipath/index.html -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list ========================================================== For more information on the Television New Zealand Group, visit us online at tvnz.co.nz ========================================================== CAUTION: This e-mail and any attachment(s) contain information that is intended to be read only by the named recipient(s). This information is not to be used or stored by any other person and/or organisation. -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
