Dell MD3000i .vs Clariion CX3-20

rparsons1000
rparsons1000 used Ask the Experts™
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I currently use a Clariion CX3-20 with 2 DAE's (300G 10K SAS) for all of my Hyper-V R2 virtual machines and am quite happy with it. I am pretty much out of space and can either purchase another DAE or put all new VM's on a Dell MD300i with 1 MD1000 attached to it. The 3000i has 15 300 Gig 7.2k SATA drives that is used for backups and an MD1000 that has a mix of 4 1TB 7.2K for backups and 4 300Gig 10K SAS drives used for test Virtual Machines.

Would it be better to go ahead and buy another DAE for the EMC or just add some drives to the MD1000 for more VM's and move to IScsi? I am concerned with the processing speed of the Dell solution versus the fiber channel SAN. Bandwidth really isn't a concern as we don't even come close to 1 GBps on the fiber channel SAN.
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Commented:
Fibre Channel is king.  SATA = evil.  SATA doesn't have nearly the IOPS for multi-user environments, let alone multi-server environments like ESX.  For testing, fine, but production?  I'd stay away...

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Commented:
The MD3000i is using SAS for VM's. I do know all about 7.2k SATA for VM's, it was terrible when I tried to use them a long time ago.

I did do some IO testing alst week and the fiber channel was 5 times faster than SAS and much more than that over SATA.

Commented:
SAS is much better than SATA, though still not as fast as FC.  Now it comes down to the actual level of performance you need, and the cost difference between the two.

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Commented:
I prefer add a DAE with SAS disks,

1) IOPS are served 5 to 7 times better than sata disks.
2) Using clariion resources like cache and process time with better redendency.
 

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Commented:
I do think we will go with a DAE.

What do you all think about the Equallogic IScsi SAN's to replace the EMC Clariion? I've got one more year left on the Clariion and am thinking about switching to IScsi.

Commented:
Incase you want to go with sata , only good option you have is, your I/O should be sequential. For sequential I/O , many use sata. Sata is no near to SAS disks in case of performance, if you skip the cost factor.
Commented:
Depends on what you're supporting with it.  FC disk is still superior to SAS disk, even Enterprise SAS.  With that said, the difference is not huge, but for some places, it is enough.

Also depends on the amount of bandwidth you need.  With iSCSI you can get 10GbE, but FC will be up to 16Gb/s soon, so, it's a horse a piece I suppose.

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