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(a)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(a)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(a)mathworks.com [mailto:owner-toasters@mathworks.com]
On Behalf Of John Clear
Sent: Wednesday, January 18, 2006 10:46 AM
To: Michael Haller; toasters(a)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(a)mathworks.com [mailto:owner-toasters@mathworks.com]
On Behalf Of Michael Haller
Sent: Wednesday, January 18, 2006 2:33 AM
To: toasters(a)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