Solved

Vmware SSD question

Posted on 2015-01-06
16
180 Views
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?
0
Comment
Question by:Cobra25
  • 8
  • 4
  • 4
16 Comments
 
LVL 118
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?
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40534346
Just trying to get the most performance, andrew what do your recommend?
0
 
LVL 118
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.
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40534532
I need RAID for redundancy.

Anything else i should look into on VMWARE for better performance?
0
 
LVL 118
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
0
 
LVL 47

Expert Comment

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)
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40545803
why is it bad?
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40547517
Should i go with Raid 10 then?
0
What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

 
LVL 118
ID: 40547710
RAID 10 would be better, but performance is probably not what you would expect.

Try RAID 1.
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40547724
Raid 1 or Raid 10?? I have 4x 480Gb SSD's
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40547744
i do need redundancy.
0
 
LVL 47

Expert Comment

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
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40561267
i do care about performance, but i wouldnt have enough space to set it up that way.
0
 
LVL 47

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.
0
 
LVL 4

Author Comment

by:Cobra25
ID: 40561352
i really want to know how "bad" ssd is with raid5.
0
 
LVL 47

Accepted Solution

by:
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.
0

Featured Post

Complete Microsoft Windows PC® & Mac Backup

Backup and recovery solutions to protect all your PCs & Mac– on-premises or in remote locations. Acronis backs up entire PC or Mac with patented reliable disk imaging technology and you will be able to restore workstations to a new, dissimilar hardware in minutes.

Join & Write a Comment

Suggested Solutions

It Is not possible to enable LLDP in vSwitch(at least is not supported by VMware), so in this article we will enable this, and also go trough how to enabled CDP and how to get this information in vSwitches and also in vDS.
When we have a dead host and we lose all connections to the ESXi, and we need to find a way to move all VMs from that dead ESXi host.
Teach the user how to convert virtaul disk file formats and how to rename virtual machine files on datastores. Open vSphere Web Client: Review VM disk settings: Migrate VM to new datastore with a thick provisioned (lazy zeroed) disk format: Rename a…
Teach the user how to configure vSphere Replication and how to protect and recover VMs Open vSphere Web Client: Verify vsphere Replication is enabled: Enable vSphere Replication for a virtual machine: Verify replicated VM is created: Recover replica…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now