Throughput\latencies will definitely be better with the 144's - in some particular applications, you will need more spindles than space (databases of pretty much any sort, unless it is very low utilization\decision support).

Having two shelves would be nice to help guard against SPOF, but if you loose 1 shelf the filer will still halt due to doubledisk failure...

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Jeff Mohler Sent: Wednesday, January 18, 2006 2:30 PM To: John Clear; Michael Haller; toasters@mathworks.com Subject: RE: DS14MK2 with 300GB versus 144GB - question

It all depends on the workload that you want to perform across the volumes contained within those populations of drives.

You may, or may NOT see a difference. Reliability isnt a huge issue, since Raid-DP and an active support contract take care of the 100% failure rate that -all- hard drives eventually achieve.

If you remove the issues concerning raid groups sizing, if/how you use flex volumes, and directory sizes..Its all about balancing the cost of ATA against the IOPS benefit of FCAL.

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of John Clear Sent: Wednesday, January 18, 2006 10:46 AM To: Michael Haller; toasters@mathworks.com Subject: RE: DS14MK2 with 300GB versus 144GB - question

I have about 800 300GB drives across a bunch of FAS980s and R200s and about 400 144GB drives across a bunch of F880s/FAS960s/FAS270s according to DFM.

Throughput seems fine, although I have done any specific benchmarks. The high density reduces space/power/cooling requirements, which has its own benefits.

John

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Michael Haller Sent: Wednesday, January 18, 2006 2:33 AM To: toasters@mathworks.com Subject: DS14MK2 with 300GB versus 144GB - question

Hi,

Does anybody have any experience or comments on the use of a single DS14MK2 with 300GB drives versus two DS14MK2 with 144GB dirves. I would have thought that throughput, reliability and on-going costs would be better with the 144s.

Any comments or advice appreciated.

Ta,

- Michael