On 21-Jul-09, at 9:25 , F. Wessels wrote:
So to wrap it up. According to Will, a supermicro chassis using a
single lsi expander connected to sata disks can utilize the wide sas
port between hba and the chassis. (like a J4500 Richard mentioned.
How much I like these systems (thumper etc), they're way out of my
budget.) Will did see more throughput than a single link could
handle. But due to insufficient disks no more i/o could be generated
to better demonstrate the availability off the wide sas port.
I assume the J4500 is using dual expanders. Richard, can you confirm
that the J4500 is using an active/active sata mux per drive to allow
failover between expanders? Aside from this can you also confirm
that a wide sas link between a hba and a single expander can be
fully utilized when using sata drives? To rephrase, utilization is
independent of the disk type (sas or sata)
The J series JBODs aren't overly expensive, it's the darn drives for
them that break the budget.
And, on that subject, is there truly a difference between Seagate's
line-up of 7200 RPM drives? They seem to now have a bunch:
Model Bus Capacity SKU Cost (USD)
7200.12 SATA 3.0Gb/s 1TB ST31000528AS $90
ES.2 SATA 3.0Gb/s 1TB ST31000340NS $158
ES.2 SAS 3Gb/s 1TB ST31000640SS $215
Other manufacturers seem to have similar lineups. Is the difference
going to matter to me when putting a mess of them into a SAS JBOD with
an expander?
Thanks for everyone's great feedback, this thread has been highly
educating.
A.
--
Adam Sherman
CTO, Versature Corp.
Tel: +1.877.498.3772 x113
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