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ESXi6 DataStore for VM's and SwapFile Location (SSD's & RAID HDD's)


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Hi Guys,


I Have the follwing SATA configuration on my GEN8 Microserver


1 RAID1 Volume - 3TB (Bay1 & Bay2) -> RDM.

1 RAID0 Volume - 1TB (Bay 3) -> DataStore.

1 RAID0 Volume - 640GB (Bay 4) -> DataStore.

1 RAID0 Volume (SSD - 240GB) -> DataStore.


I Thinking of moving all Windows and high performance VM's on SSD Datastore but due to lack of Storage i am thinking of moving their temp files-SWAPFILES (RAM e.t.c) to other datastore location e.g. [1 RAID0 Volume - 1TB (Bay 3) -> DataStore.] OR 1 RAID0 Volume - 640GB (Bay 4) -> DataStore.


Will this delay much VM's?


Is anybody test it or benchmark it?


Thanks in advance for your replies.



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I can see where you might pickup a little bit of performance.  I do the same thing with my host using Server 2012R2.  The OS sits on its own drive and the swap file is pointed to another physical drive that is partitioned into two volumes.  I think I allocated 56 gigs for the swap file since the host has 64 GB RAM.


The VM's I pretty much leave alone but have them configured similar to what you have.  The hardest working VM's are on a RAID0 SSD datastore while the other test VM's on are a RAID0 running on 10K RPM SAS drives.  I've never thought about passing the swap files out from the VM's to another physical drive as making that hop out would seem to slow down the system (or not gain anything) in my mind.


It would be an interesting test to benchmark.

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I have a 480GB SSD, so that helps a bit. I have also used thin provisioning on the SSD. This means that all my VMs OS drives are on the SSD. So, start up a 60 day license Virtual Center Server and do a cold migrate changing OS disk to thin? All this assumes the VM OS disks are 'small' and each VM has data disk(s) on the slow drives. You can then leave swapfiles as default.



Edited by MikeJ
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