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Vmware SSD question

Posted on 2015-01-06
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Last Modified: 2015-01-29
hey guys,

I have a supermicro server with SSD drives in Raid-5. I installed esx 5.5 on there, but when i connected via vsphere to check my datastore, it showed drive type as non-ssd. How do i make sure vmware sees these as SSD?
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Question by:Cobra25
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LVL 120
ID: 40534048
Your RAID storage controller is "masking" the drives as SSDs to VMware vSphere, when you have created the RAID set.

Also note your performance of RAIDing SSDs may not be as expected!

You may be able to use my EE Article to "fake the drives" as SSD
(these also work with ESXi 5.5!)

HOW TO: Tag and Configure a storage device as a Solid State Disk (SSD) in VMware vSphere 5.0 or 5.1  (ESXi 5.0 or ESXi 5.1)

HOW TO: Configure Host Cache Configuration for your VMware vSphere 5.0 or 5.1 ESXi (5.0 or 5.1) Host Server

What do you want to do with the SSDs, what features do you want to enable?
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by:Cobra25
ID: 40534346
Just trying to get the most performance, andrew what do your recommend?
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LVL 120
ID: 40534526
In that case it does not matter whether ESXi OS detects the disks as SSDs.

You may find it faster in you break the RAID and present each SSD individually to the ESXi host.
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by:Cobra25
ID: 40534532
I need RAID for redundancy.

Anything else i should look into on VMWARE for better performance?
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LVL 120
ID: 40534549
If you want redundancy you will need to leave the disks as RAID 5.

Whether it states SSD or NOT, it will still use the datastore "as is", and because you have no latency, it will be faster, because it's using SSDs.

See this other question, which is a similar question about SSDs and ESXi 5.5.

http://www.experts-exchange.com/Software/VMWare/Q_28591761.html
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by:dlethe
ID: 40534681
Raid5 on SSDs are bad on so many levels
Why not take a pair of them and use software mirroring

(Yes capacity may be an issue.  Or get a controller and mechanical hdd that is in the HCL)
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by:Cobra25
ID: 40545803
why is it bad?
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by:Cobra25
ID: 40547517
Should i go with Raid 10 then?
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LVL 120
ID: 40547710
RAID 10 would be better, but performance is probably not what you would expect.

Try RAID 1.
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by:Cobra25
ID: 40547724
Raid 1 or Raid 10?? I have 4x 480Gb SSD's
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by:Cobra25
ID: 40547744
i do need redundancy.
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by:dlethe
ID: 40547823
R1, and if you really cared about performance ...and this is transactional DB then do vmdirect and software mirroring on two Of the ssds
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by:Cobra25
ID: 40561267
i do care about performance, but i wouldnt have enough space to set it up that way.
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Expert Comment

by:dlethe
ID: 40561298
The correct place for SSDs is tempDB, scratch index files, and the O/S.   Everything doesn't have to be the same capacity.  Get two low capacity HDD or SSD for the OS and this stuff, along with swap, and then larger devices for everything else.
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Author Comment

by:Cobra25
ID: 40561352
i really want to know how "bad" ssd is with raid5.
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Accepted Solution

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dlethe earned 500 total points
ID: 40561364
The two biggies are:
- I/Os will be unaligned, meaning big performance hit, along the lines of mechanical HDDs.  
- No TRIM even possible, so SSDs burn out earlier and doesn 't know what blocks are stale.
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