[Ocfs-users] problem with OCFS label

[Raj]

You would not need to worry about that even if you add/remove LUNs. 
Powerpath maintains a consistent "Logical device ID" across nodes. Even if 
your nodes scans the same LUN as say for example empowerc on node1 and 
emcpowerd on node2, thier Logical device ID will be the same. Hope that 
helps.

Raj

On 8/31/05, Wu, Hai <hxwu at tribune.com> wrote:
> 
> Raj,
> I am using PowerPath 4.3.2/RHEL ES3U4/OCFSv1/CX700. For the same node, are 
> you saying I don't need to worry about adding/removing LUNs? I thought the 
> device number would change, say from emcpowerd to emcpowerc, if we were to 
> remove emcpowera.
> 
> Thanks,
> Hai
> 
> -----Original Message-----
> From: Raj [mailto:sanstorage at gmail.com]
> Sent: Wed 8/31/2005 10:48 PM
> To: Wu, Hai
> Cc: Joel Becker; ocfs-users at oss.oracle.com
> Subject: Re: [Ocfs-users] problem with OCFS label
> Wu,
> 
> OCFS label does not work with EMC powerdevices. EMC powerdevices uses a 
> logical ID number which knows the path to the correct LUNs on the backend. 
> Compare those on each nodes and they will be the same. Do a powermt display 
> dev=all and you find that long number which will be the same across nodes. 
> If you need a consistent look and feel across all the nodes you will need to 
> copy the Powerpath config file across nodes and then reboot. What version of 
> PowerPath are you using?
> 
> Hope that helps.
> 
> Raj
> 
> 
> On 8/31/05, Wu, Hai < hxwu at tribune.com> wrote:
> 
> Thanks Joel. If I can't use OCFS label, then how can I make sure I am 
> still mounting the same emcpower device if we need to add/remove powerpath 
> LUNs? I know that devlabel would not work in this case. (And IBM this its 
> own way of dealing with this problem, not sure about EMC in this case).
> 
> Thanks,
> Hai
> 
> -----Original Message-----
> From: Joel Becker [mailto: Joel.Becker at oracle.com]
> Sent: Wed 8/31/2005 8:28 PM
> To: Wu, Hai
> Cc: ocfs-users at oss.oracle.com
> Subject: Re: [Ocfs-users] problem with OCFS label
> On Wed, Aug 31, 2005 at 06:42:20PM -0500, Wu, Hai wrote:
> > But when I tried to mount this ocfs filesystem by label, it gave me the 
> following error.
> > # mount -L data13 /oradata/data13
> > mount: the label data13 occurs on both /dev/emcpowerp1 and /dev/sdad1 - 
> not mounted
> 
> This isn't a bug, this is a common problem with multipath.
> mount(8) does not know that /dev/emcpowerp1 and /dev/sdad1 are the same
> drive. So it cannot decide which to use. You must mount by device name
> in this case.
> 
> Joel
> 
> --
> 
> "Gone to plant a weeping willow
> On the bank's green edge it will roll, roll, roll.
> Sing a lulaby beside the waters.
> Lovers come and go, the river roll, roll, rolls."
> 
> Joel Becker
> Senior Member of Technical Staff
> Oracle
> E-mail: joel.becker at oracle.com
> Phone: (650) 506-8127
> 
> 
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