Design storage with VAAI

Hey everyone, have a question of the storage design.

At the time where we did not have a San with VAAI, scsi reservations have been a limiting factor in all design considerations.  We did small clusters and presented a less number of LUN - with these LUNS being shared amoungst the smallest possible number of hosts - and ran under VMs per lun.

Now, however, we have a new San with capacity VAAI.  We currently have 7 business incubators - who all have their own set of LUNS/data warehouses.

Is there a reason (reservations scsi no longer a problem) why I should not introduce all LUNS to guests in all clusters? I know there is a limit of 255 LUNs, however, I'm not afraid with this limit that strikes. Will be the performance of this impact in some way? Y at - it overload memory serivce console?  Without scsi reservations, our main factor limiting (to me) is one of depth of queue - that would be for each host.  So if I can increase the number of hosts that can be seen by a single data store - I should be able to also increase the number of VMs on this data store as long as load the virtual machine is distributed over several hosts.  Is this correct?

In addition, most of our cluster is built the way they are because of software migrate license restrictions, so it often happens that we have to move a VM between clusters - I used cold - but now I use a data store models or Transition that is presented to all hosts irrespective of cluster.  Even if it means no interruption of service - there are still several steps to move the virtual machine (2 svmotions and a vmotion).  It would be very convenient that all the guests could see all data warehouses - but I don't want to break any design best practices.

Thank you and appreciate any input!

The circumstances are different, and if you find that a recommendation is not so appropriate considering another design choice can be the most appropriate solution for you.

I'm not entirely sure scsi reservations are no longer a problem, but whose impact has considerably decreased with assisted hardware locking.  As far as I know, there is no additional charge to hypervisor with additional data warehouses.  Performance should not be touched in any way, except when doing things like analyses or updates from storage, these can take longer.  HA master election process in vSphere 5 analysis also stores data connected on each host, it can also add a small overhead (almost irrelevant if)...

* edition I missed some valuable pieces in the original post made my useless response *.

Tags: VMware

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