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SSD vs multiple HDDS, Vmware

post #1 of 4
Thread Starter 
What would be faster for a computer running 5 virtual machines
2 sql servers,
2 servers that people login to and run some basic apps with low disk usage
1 machine that runs quickbooks



6 hdd's 1 for the host and one for each vm
or all of it running on one intel g2 ssd?


Asume disk space is not of any concern
Edited by justinjja - 7/21/11 at 10:37am
Lappy
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Lappy
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post #2 of 4
Probably the HDDs, for a server writes tend to matter more and SSDs aren't good with those.
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post #3 of 4
What are you running, ESXi? I'm running it at home and have been at it for a couple of weeks now starting from Virtualization scrap (lol) and learning tons. Pretty awesome and addicting stuff...

My current setup that is still very much in testing has my ESXi host and so far 3 VMs installed on 1x Crucial m4 64GB SSD with 2x 2TB drives for storage.
I am running an UnTangle Router/Firewall VM that's all set up and working GREAT so far, a Ubuntu Server VM using the 2TBs (RAW drives mapped through ESXi) in an mdadm RAID1 (still playing around, ultimately want it to be a 4x 2TB RAID5 File Server) and a rarely used XP VM.

So far this has worked out well for me, but I'm nowhere near your level of use.
I would tend to think that the lone SSD would be just fine serving the user environments while still providing better performance than individual HDDs, but I would keep ALL heavy and important data on HDD. Also, depending on frequency and how much data your moving, the SQL servers may be more suited to their own HDDs... otherwise if data overhead is low, the SSD might be the better route for performance...

The other concern, that I share as well, is using the SSD in this environment. At present ESXi does not support TRIM and unless your SSD has pretty decent Garbage Collection (don't THINK my m4 does) you may run into reduced performance after awhile. My plan is to just see how it goes because apparently at worst when performance degrades a wipe of the drive and restoration of your Host and VMs will put you running on a fresh drive again. It really is a shame ESXi doesn't support TRIM yet as SSDs otherwise seem to be absolutely PERFECT for this sort of thing
Edited by Slave One - 7/21/11 at 12:07pm
    
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post #4 of 4
Depends on your usage really. In general I would use a combination. anything requiring high iops I would create the VMDKs on the SSD. For everything else I would put it on the HD, including the swap file for ESXi.
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