[Ocfs2-users] How to mount OCFS2 file systems using the EMC Power Path multipath device

[Sunil Mushran]

There is another scheme (less elegant but probably quicker to deploy) that
was described in this list by a user.

As root run blkid. Then edit /etc/blkid.tab and remove all sd devices that
correspond to the emcpp devices. Ensure pp is enabled. Rerun blkid. This
time you should see the pp devices in /etc/blkid.tab. If not, you should be
able to hand edit those device.

Now mount by label and mount by uuid will mount the pp device.

Sridhar Avantsa wrote:
> Joel,
> Thanks for the reply.
> Wondering if you have a sample udev set up using power path on hand 
> that I can use to get going.
>
> Thanks
>
> On Wed, Jun 10, 2009 at 12:43 PM, Joel Becker <Joel.Becker at oracle.com 
> <mailto:Joel.Becker at oracle.com>> wrote:
>
>     On Wed, Jun 10, 2009 at 12:22:03PM -0500, Sridhar Avantsa wrote:
>     > OEL 5, OCFS 1.4, using EMC Power Path for multi pathing.
>     >
>     > I want t mount the OCFS2 file system on the emc power path device.
>     > I can mount by UUID, and not have to worry about persistent
>     bindings across
>     > nodes.
>     > But how do I make sure when it mounts by UUID , that the pwoer
>     path device
>     > is used.
>     >
>     > Any help will be much appreciated.
>
>            There are two things you can do.  The first is to not worry,
>     because PP takes over all devices.  That is, if 'sda' and 'sdb'
>     are two
>     paths of 'emcpowera', it doesn't matter whether you open /dev/sda1,
>     /dev/sdb1, or /dev/emcpowera1.  PP has hijacked the devices and is
>     used
>     in all cases.
>            Now, a lot of people consider this to be unkosher and wish that
>     PP didn't hijack the devices.  Maybe in the future EMC will change
>     this.
>     You can, of course, not worry about it until they do.
>            The other alternative is to use udev to ensure you have a
>     device
>     name that points to the right device.  Then you just mount by the
>     device
>     name.  For example, a udev rule that only triggers on 'emcpower*'
>     devices, checks that they are ocfs2 volumes, and then creates
>     /dev/mydisks/<uuid> for them.
>
>     Joel
>
>     --
>
>     Life's Little Instruction Book #396
>
>            "Never give anyone a fruitcake."
>
>     Joel Becker
>     Principal Software Developer
>     Oracle
>     E-mail: joel.becker at oracle.com <mailto:joel.becker at oracle.com>
>     Phone: (650) 506-8127
>
>
>
>
> -- 
> Sridhar Avantsa
>
> savantsa at gmail.com <mailto:savantsa at gmail.com>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users at oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users