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(2) Dell PowerEdge 2900s with DAS vs. (2) Dell PowerEdge 2900s with iSCSI SAN (EqualLogic PS5000X)

Posted on 2008-10-30
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Hello,

Can anyone tell me which storage would perform better and why?

(2) Dell PowerEdge 2900s and both are configured with (10) 15K SAS drives; (2) are 73GB RAID 1 and (8) are 146GB RAID 10.

vs.

(2) Dell PowerEdge 2900s connected (via iSCSI) to a Dell EqualLogic PS5000X with (16) 400GB 10K SAS, (14) RAID 10 and (2) Hot Spares.

The servers with DAS are using a PERC 5/i integrated SAS 3.0 Gb/s RAID controller. They are running ESX 3.5 with a couple SQL servers, an Exchange server and 10 other Windows servers and both are performing well. I would like to add a SAN and I'm trying to figure out what I need performance wise. I know the vendors will help with sizing but I wanted to hear opinions and real world experiences.

Will the SAN with (14) 10k SAS perform as well as the 15k DAS or should I consider a SAN with 15K SAS?
What impact will the two servers have on the shared SAN vs. each having their own DAS?
What if I wanted to add a 3rd or even a 4th ESX host to to the same SAN without adding bandwidth, should I be concerned?

We're also considering a Dell EqualLogic PS5000E with (16) 250GB SATA at our DR site. Do you think the SATA SAN will perform well enough to restore critical services with lower performance or should I stick with SAS?

Thanks!
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Question by:jswan
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SysExpert earned 2000 total points
ID: 22851180
Your answers all depend on how much data bandwidth you need.

Internal is quite fast, once you go iSCSI, you are dependent on the bandwidth to your box, and the controller.

So you need to compare that with your internal speed.

You are probably not going to get better performance using 10K drives instead of 15K drives in any case, unless you use a LOT more drives with 10K.

I hope this helps !
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