Simply no.
4Gbps can work with 4, 8 and 16Gbps interface on the other end. I think
even current newest Hitachi DASD boxes may have 16Gbps interfaces, not
32Gbps as the only choice.
Last, but not least: DIRECTOR. FICON switch allows to connect any to any
speed. Yes, including 1Gbps to 32Gbps.
More obviously one can connect 4Gbps FICON port to a switch with any
(2,4,8,16) SFP and this port can connect to a dasd box connected in
similar way, lets say 32Gbps device port connected to 16Gbps SFP. The
switch can "transmit" FICON traffic from any to any port, despite of SFP
speed.
The "window of compatibility" apply to physical fiber optic link and
transceivers on both ends (SFPs). The window is "n-2", which means 1Gbps
will talk to 1, 2, 4Gbps. 2Gbps will talk to 2, 4, 8 Gbps. 4Gbps will
talk to 4, 8, 16 Gbps.
Note, there are other things to consider, but it regards very old CUs
and microcode - older than z9. AFAIK the change was in z196 machine.
--
Radoslaw Skorupka
Lodz, Poland
W dniu 26.06.2020 o 17:09, Bill Bishop (TMNA) pisze:
One issue that you may encounter with going to a new storage system on a z9
processor is the speed of the ficon cards and whether the new unit can z9
cards. I am not sure the new Hitachi's can work with 4GB ficon.
I would make sure that if you replace it, with whichever vendor, that the new
unit can work with those old z9 cards.
Thanks
Bill Bishop
Consultant, Mainframe Engineer
Mainframe and Scheduling | Infrastructure Technology Services
Toyota Motor North America
bill.bis...@toyota.com
Office: (469) 292-5149
Cell: (502) 316-4386
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Grant Taylor
Sent: Friday, June 26, 2020 10:05 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: [EXTERNAL] DASD migration -- Re: Hitachi RAID box going out of support
On 6/26/20 3:16 AM, R.S. wrote:
3. 18 months is close to half of typical service contract for new dasd
array. Still we don't know how sure is 18 months - maybe it would be
36 months? Even 12 months means the dasd array would have some residual value.
n00b questions:
1) Is it possible to migrate from old DASD to new DASD?
2) How disruptive would this be to the day-to-day operation of the existing
mainframe?
3) What sort of prerequisites exist for this?
I have some experience with this in the Open Systems environment, but I'd like
to know more about how such a storage migration would be done in the mainframe
world.
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