[Ocfs2-users] Reservation conflicts

[Joel Becker]

On Thu, Dec 09, 2010 at 04:02:14PM -0600, brad hancock wrote:
> I have two vmware guests that share a OCFS2 partition through VMWare VMFS.
> It resides on a SAN.

	Let me see if I understand the configuration.  You have a SAN.
On that SAN is a LUN.  You have one VMWare host in this configuration.
The VMWare host has formatted that LUN for VMFS.  There is a disk image
on the VMFS that both guests see as sdb.  Is this correct?

> Each host has the following error in the kernel log:
> 
> [2037805.922718] end_request: I/O error, dev sdb, sector 1735
> [2037805.922974] (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5
> [2037805.923370] (27506,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5
> 
> 
> We also see the following on both machines:
> 
>  (1888,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5
> [202381.822030] (1888,0):o2hb_do_disk_heartbeat:762 ERROR: Device "sdb1":
> another node is heartbeating in our slot!
> 
> I notice the sector is the same on both machines: 1735.
> 
> Is this an issue with vmware?

	The read errors ("another node is heartbeating in our slot")
sound like VMWare is not allowing the nodes to see each other's
activity.  The write error is more surprising, but it could be part of
the same issue.

Joel


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Joel Becker
Senior Development Manager
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127