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Lun size

Posted on 2016-07-19
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Last Modified: 2016-07-20
Hi,
I use two MD3200i for iSCSI storage on my VMware.
I manage several  virtual machines with different disk size, I mean: some with 1 TB disk, some 80 GB, some 200 GB, and so.
What is suggested way to create lun according to various disk size?
Is it better to have little lun with large space, or the opposite?
Thank you
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Question by:Armitage318
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 41719391
There is no real best practice, or recommendation, it's what best suits your organisation.

Over many years, we generally create LUNs of sizes between 500-800GB, and if requirements are for supersize LUNs, for large virtual machines e.g. 1TB, 2TB or 12TB we create supersize LUNs for those.

Remember, when creating LUNs, to allow for 20-30% free space on the LUN for Memory SWAP files = to the size of memory (RAM) allocated to the virtual machine, and also Snapshots, if you will be using backup software, and monitor the LUN space, e.g. at 75% and 85%.

Also do not allocate ALL your space from your MD3200i, it's often wise to allocate and create LUNs as and when you need them.

Sometimes, you may run out of space on a LUN, and it's very quick and easy to expand a LUN, if you have free unallocated storage, if you have non left because you've allocated it all out to VMs/LUNs, you are then faced with moving VMs off the LUNs (datastores) to a new datastore.
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