[Ocfs2-users] Reservation conflicts

[kevin at utahsysadmin.com]

On Fri, 10 Dec 2010 06:26:06 -0800, ocfs2-users-request at oracle.com wrote:
> 
> My setup has the SCSI controller set to Physical so the guest can be on
> different hosts, but I do not have the disk setup as Independent. I am
> going
> to change that setting in VMware and see if it makes a difference.
> 
> > [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

Brad,

I have had the same issue for over a year on ESX 3.5 as well as on vSphere
4.0.  I have not tried yet on 4.1.  The error occurs when I put the shared
disk on either SATA or FC LUNs on our SAN.  It also doesn't matter if the
virtual machines are on the same physical host or not (with independent
disks).  The only problem that has come from it is the occasional reboot of
one of the VMs, which for me is tolerable.  I keep hoping to upgrade to a
new SAN thinking that might fix it.  The vSphere 4.0 release IOPS
capability is higher than the SAN (it's 5 years old) so I didn't think it
was VMware's fault.  If you have fairly new hardware, maybe there is a real
bug somewhere.  I don't get I/O errors in any of my other implementations
on this SAN.  I sent a post like yours to the list when I first built it,
but never opened a bug report with either OCFS or VMware.  If you create a
bug report I could add information from my implementation as well.  (I
actually have two of these setups and they both have the same errors.)

Of course, if you find a solution, please post that as well.

Thanks,
Kevin