Ocfs2 users - Jun 2009 - How to mount OCFS2 file systems using the EMC Power Path multipath device

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.

Thanks

-- 
Sridhar Avantsa

savantsa at gmail.com
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Have you tried doing this by using disk label instead, you just need to
make sure you format the OCFS2 lun by adding the label to it

 

Saul

 

________________________________

From: ocfs2-users-bounces at oss.oracle.com
[mailto:ocfs2-users-bounces at oss.oracle.com] On Behalf Of Sridhar Avantsa
Sent: Wednesday, June 10, 2009 10:22 AM
To: ocfs2-users at oss.oracle.com
Subject: [Ocfs2-users] How to mount OCFS2 file systems using the EMC
PowerPath multipath device

 

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.

Thanks

-- 
Sridhar Avantsa

savantsa at gmail.com

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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
Phone: (650) 506-8127

Can not use label, since mount will come back with "Duplicate device for
same label".
Can nto say I tried it now.
Did try it earlier on OCFS2 1.2 when it did fail.
I see no reason for the beaviour to change.

On Wed, Jun 10, 2009 at 12:33 PM, Saul Gabay <SaulG at herbalife.com>
wrote:
>  Have you tried doing this by using disk label instead, you just need to
> make sure you format the OCFS2 lun by adding the label to it
>
>
>
> Saul
>
>
>  ------------------------------
>
> *From:* ocfs2-users-bounces at oss.oracle.com [mailto:
> ocfs2-users-bounces at oss.oracle.com] *On Behalf Of *Sridhar Avantsa
> *Sent:* Wednesday, June 10, 2009 10:22 AM
> *To:* ocfs2-users at oss.oracle.com
> *Subject:* [Ocfs2-users] How to mount OCFS2 file systems using the EMC
> PowerPath multipath device
>
>
>
> 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.
>
> Thanks
>
> --
> Sridhar Avantsa
>
> savantsa at gmail.com
>


-- 
Sridhar Avantsa

savantsa at gmail.com
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