Added a new ESX3 host to my cluster and configured for DRS & HA but migrations are failing. Reason I believe is because this host is unable to see one particular SAN datastore that the others can see and I can't work out why.
I've been all through my SAN zoning and it's identical to the other servers. It can see 2 of the 3 stores but for some reason can't see the other one.
Anyone had this problem before?
Andy
Did you do a Rescan of LUNS and VMFS volumes in Virtual Center? Most of the time it is a zoning problem or a presentation problem with the LUN numbers. Each ESX server has to see the same LUN numbers that the others see.
Here's similar threads...
http://www.vmware.com/community/thread.jspa?messageID=498643ñ¹¯;
http://www.vmware.com/community/thread.jspa?messageID=451973ñ® ;
Also check out the SAN config guide...
Also check you Configuration, Advanced Settings, Disk on that Server to see if you have a Disk.MaskLuns or Disk.MaxLun set.
Also, you may have an issue where the new host thinks that that 3rd LUN is a snap lun. I'm having that problem right now.
Anyway, if you go to Configuration, Advanced Settings, LVM and change LVM.DisallowSnapshotLUN from 1 to 0, your host may see this lun.
It is not recommended that you leave this setting at 1, but until you can figure out why ESX thinks that this LUN is a snapshot, you may have to.
Mayur
update: We figured out our problem, we did not have all of the LUNs matched an the hosts. Take a look at your LUN numbers.
Mayur
Thanks for all your suggestions guys. I tried each one but nothing changed. However, I also noticed that a second server that I was preparing to add into my cluster also has the same problem - can't see the 3rd datastore.
I checked all the SAN LUN's and they are 100% identical amongst each ESX host. It just doens't make any sense.
I'll let you all know if I figure it out.
Andy.
Hi
Message was edited by:
sepso
Hi Andy,
if you assume that the LUNs cannot be seen by all 4 cluster members, It would make sense to cross check that.
SSH to all three servers and see whether you can access the VMFS volumes
cd /vmfs/volumes/ then you will see the volume
Stephan
Hi
juste litle question about LVM.DisallowSnapshotLUN
With mixed configuration ;
ESX see "snapshoted lun or mirroring lun" and "normal" lun
It is not recommended to leave this setting at 1 or ZERO ?
1 is by default but for see mirrored lun we set to 0 and rescan san ...
what's better situation ? many thanks .
Régis