Re: Re: Interesting idea

On 10/12/10 2:38 PM, paoloG wrote:
>>     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?
>
> 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....

   Oh, the 3909 only had B&T?  I thought ESCON had been introduced by 
then, thank you for the correction.  My IBM iron experience is both much 
older and much newer than 3090; I have a big gap in the middle! :-(

   I'm working with some 4Gbps FibreChannel SAN systems at work now; man 
that's some I/O bandwidth.  My home storage system is 2Gbps FibreChannel 
and it really moves some bits.  We really have come a loooong way.  It's 
just amazing!

             -Dave

-- 
Dave McGuire
Port Charlotte, FL