1 Reply Latest reply: Apr 21, 2011 8:27 PM by mattcowger RSS

ESXi and LUNs

Danilo_Dicesare

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

  • 1. Re: ESXi and LUNs
    mattcowger

    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).