[Ocfs2-users] mounting mpath devices

[Ulf Zimmermann]

> -----Original Message-----
> From: ocfs2-users-bounces at oss.oracle.com [mailto:ocfs2-users-
> bounces at oss.oracle.com] On Behalf Of Masaryk Kevin D
> Sent: 02/24/2009 13:21
> To: ocfs2-users at oss.oracle.com
> Subject: [Ocfs2-users] mounting mpath devices
> 
> I'm seeing some strange behavior from OCFS2 while trying to mount
> mpath/dm-multipath devices under RHEL5. Sometimes I can mount the
> EMC-connected, dual-pathed volumes just fine and sometimes I get
> "device
> busy" errors. I've tried mounting by label and also by explicit
> /dev/mapper/mpathXpY name with the same unpredictable behavior. I've
> also noticed that sometimes when a device is successfully mounted on
> all
> nodes, each node may return different output from the mount command
> regarding the device mounted; e.g. /dev/mapper/mpath0p1 vs.
/dev/dm-17.
> 
> One consistent aspect I have noticed whenever I receive the "device
> busy" error is that the /dev/dm-X names don't match up on each node. I
> also see that ocfs2console refers to each device by the /dev/dm-X name
> instead of the /dev/mapper/XX name.
> 
> I guess my question is simply: Are dm-multipath devices supported
under
> OCFS2? Are multipathed devices not recommended with OCFS2? Any
> documentation available on this?

We are using OCFS2 with device-mapper-multipath (4 paths) and we use the
/dev/mapper/XX names.

Names match across machines although we did not particular paid
attention to make it the same.

Regards, Ulf.

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