Re: Interesting idea

--- In [email protected], Dave McGuire <Mcguire@...> wrote:
>
> On 10/11/10 11:41 AM, jeffsavit wrote:
> >>     Yes, but the I/O bandwidth, mmmmm!  *drool*
> >
> > Actually, I don't think so. My 4 year old home computer does well over 30MB/second on a single commodity-spec disk drive, enough to saturate two ESCON channels of the 3090 time period, and of course server-class products do much more.  Current server-class disk arrays support tens of thousands of I/Os per second (and sometimes far higher).
> 
>    Sure, but the IBM iron I've seen have FAR more than two ESCON 
> channels.  I don't know about the 3090 series, but if I recall the specs 
> of the z9 correctly (I know, decades of difference, but it's the only 
> one that sticks in my mind) that machine can have over FOUR HUNDRED 
> ESCON channels.  I'm told they're pretty good about keeping them all 
> fed, but I don't have metrics here and don't have hands-on experience 
> with MF I/O configurations that large.
> 
>    How many channels would an "average" 3090-400 have configured?
> 

Dave,

3090-400j had 64 BUS & TAG channels (each had a speed of 4.5 MB/sec); ESCON channels were introduced in 90's. If you used 16 channels you had an I/O bandwidth of 72 Mb/sec, while a SATA-3 SolidStateDisk can transfer data at over 250 MB/sec....

BFN 

Paul