[Info-vax] The Future of Server Hardware?

[Jan-Erik Soderholm]

Stephen Hoffman wrote 2012-10-03 16:48:
> On 2012-10-03 14:18:35 +0000, Jan-Erik Soderholm said:
>
>> Stephen Hoffman wrote 2012-10-03 15:44:
>> ...
>> ...
>>
>>> IBM offers flash-based SSD caches in their XIV, and
>>> probably in the DS8000 storage controllers.
>>
>> We are currently moving VMS storage at a customer site to an
>> all-DS8000 solution. This summer this site upgraded (or rather
>> replaced) their DS8000 with a newer modell. When I talked to the
>> DS8000 manager and got our 24 and 48 GB discs configured, he said
>> that they was so small that he had thought of putting them 100 %
>> on the SSD part of the DS8000. But we decided that that was
>> not needed, we get enought I/O anyway using old-style disk.
>> We get something like 2.000 I/O per sec when hammering on one
>> of the allocated disks. 4-5 time more then the old HSZ/HSG
>> controllers.
>
> Massively faster than a 'Z or 'G is typical of these upgrades.
> It wouldn't be particularly surprising to learn that your current
> DS20E-fossil is now HBA-limited, too; that the DS8000 is waiting for your HBA.
>


Right. We use 2 Gb cards (double cards with two ports on the DS8000
for four data paths). I know that FC can run at 4 and 8 Gb (at least)
also, but maybe not on the DS20.

Anyway, using FC/DS8000 these systems now more often runs the CPU
flat out, so faster I/O would not help much.

Jan-Erik.