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1789
April 21st, 2011 06:00
ESXi and LUNs
Hi all,
i've got a discussion with a colllegue of mine regarding LUN owned from different ESXi servers.
Do you think is a good idea to share all lun on all ESXi server (so i'll have a big SAN zoning) even if ESXi server are not 'clustered'?
How the lock on VMFS works?
I do prefer (but i may be wrong) to use shared LUN only in a Cluster ESXì environment......
what do you think guys?
tnx
Dan
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mattcowger1
61 Posts
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April 21st, 2011 20:00
Hi Dan,
You're both right
.
VMFS locks works entirely within the SCSI protocol and via the disks themselves. As a result, theres no need for 2 hosts to know anything about each other and be able to safely access the same VMFS volumes - the locking / updates are handled at the VMFS level and do not require any further clustering or network activity.
That being said, it *is* a best practice to expose VMFS volumes only to hosts that will actually use/need them to avoid exceeding VMware's limits on the number of hosts accessing a given volume (generally 32, but usually better to keep that lower).