W dniu 2019-05-15 o 21:53, Pommier, Rex pisze:
<quote from Alan below>
It was sheer size of the componentry that drove this design. I think the 3990
was the last stand-alone disk controller. With the arrival of 2105s, the CU
was inside the same cabinet as the drives and Logical CUs (LCUs) were born.
One big black box (literally). Adding additional cabinets no longer affected
the I/O configuration - just capacity.
</quote>
We don't hear much about them, but where did the 9340 subsystem fit in the
timeline between 3990 and 2105? or the RAMAC2? Both those devices had the
controller built in the same frame as the disk spindles. How about the RVA?
I can answer for RVA and RAMAC2. Both are single box, that means all the
controllers, control units, etc. are integrated within the box
containing disks.
Of course RVA is really virtual, volumes are emulated, there is no 1:1
relationship between byte (block) on MVS device and physical HDA.
BTW: RVA was probably the last machine with multiple CU per device. The
CUs physically were separate PCB's large ones. (PCB - Printed Circuit
Board - electronics board). Nowadays we have CPC-severalchannels-CU-dev.
For the RVA it was:
CPCa-2channels-CUcard1-DEV1-n
CPCa-2channels-CUcard2-DEV1-n - same device, different CU.
Of course RVA did not provide new CU or device type. It was 3990 and
3390 from HCD point of view.
--
Radoslaw Skorupka
Lodz, Poland
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