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HP LeftHand SAN setup

Posted on 2012-04-11
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Last Modified: 2012-04-11
Hey experts,
I got a general setup question.  I dont know if there is a best way to do this.  So i am just looking for the best advice on which way to set up the volumes.

What i have is a HP Left Hand san with around 3TB of storage.
2 VMware host servers (Version 5.0)
8VMs all windows.

My question is is it best to say have 1 big ISCSI volume and then have all 8 VMs on that same datastore.  Or is it better to break them up into individual volumes? and have individual data stores?  Or maybe a mixture of each?

Are there any good not super complex article out there that discuss this?

Any advice on this would be greatly appreciated.
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Question by:tsukraw
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 37835412
We personally like to create datastores between 500-800GB, rather that place all your VMs, in the same large datastore

But it depends on the needs of the VM, if you required supersize virtual disks of 2TB max, , you will need to create a large datastore.

We also split like VMs, across datastores, so we do not put two Exchange VMs on the same datastore, or two SQL VMs on the same datastore, we spread them across LUNs/datastores.


vSphere Storage Guide
http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-501-storage-guide.pdf
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by:tsukraw
ID: 37835441
Is there any performance advantages to separating the SQL servers on different datastores?
A previous employee set them up with 1 large 3TB datastore.  The issue i seen with this is we have a remote snapshot that happens ever night.  Some nights the snapshot is massive and since all the servers are on 1 datastore i cannot determine which server had all the change.

What i was planning on doing was making like 3 separate LUNs.  Putting critical servers in one. Second level server is the middle and low pritority servers in the last.  That would give me the ability to at least get a general idea as to which servers are having the most change.  Would also give me the ability to remote snap our critical server multiple times a day.  And let the low priority servers snap over night.  Does this sound like a reasonable idea?
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LVL 124
ID: 37835454
we just do not like putting competing similar VMs on the same LUN. Many years ago, there was talk of LUN contention, with like VMs, so we spread them around.

Yes, I would agree with your changes.
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Author Comment

by:tsukraw
ID: 37835688
Another question.
Our file server VM has a volume of say 500GB.  There is only 75GB of data on it.  At one point in time someone ran a backup to that drive and used up all 500GB.  The drive was originally thin provisioned.  But is now fully inflated since they used all the space at one point.  If i do a Vmotion it to a new datastore and choose Thin as the drive type will it move it over as 75GB or will it move the full 500GB.  

I will run sdelete on the volume to zero out all the data before it is moved as well...
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LVL 124
ID: 37835691
another question completely off topic needs a new post.
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