John S. Giltner, Jr. wrote:
McKown, John wrote:
We are going to add two new FICON cards to out z890. If you look at the
cage, there appears to be I/O slots for them. However, when the CE went
into something on the SE to determine the PCHIDs for me, he said that it
indicated that there weren't any I/O slots. The z890 book that I have
consistantly states that the z890 has 8 STI interfaces. So there should
be a place to put the FICON cards. My question is: Does every z890
always have 8 STI interfaces, or should the z890 manual state "up to" 8
STI interfaces? BTW - the "I/O slots" that appear to be possibilities
are "domain 3" according to the manual referenced below.
Book: "2806 z890 Technical Introduction" SG24-6310
Thanks.
--
John McKown
Senior Systems Programmer
UICI Insurance Center
Information Technology
On page 6 of SG24-6310 is states:
"The z890 book supports up to 16 GB/sec of bandwidth for data
communication between I/O and memory through up to eight Self-Timed
Interconnect (STI) host buses."
On page 16:
"The logical book structure is show in the Figure 2-3 on page 17. There
are up to 8 STI buses to transfer data, and each STI has a bidirectional
bandwidth of 2.0 GB/sec."
It seems that there are 8 STI links, but that there are 0 STI
connections by default and you have to order cards in order to use them.
Check out page 38 and page 41 of SG24-6310.
On the announcement page:
http://www-306.ibm.com/common/ssi/fcgi-bin/ssialias?infotype=an&subtype=ca&appname=Demonstration&htmlfid=897/ENUS104-117
They talk about having 0 to 8 STI's in increments of 2.
It seems that there are 8 STI links, but that there are 0 STI
connections by default and you have to order cards in order to use them.
Check out page 38 and page 41 of SG24-6310.
I think it can be confusion in what is STI interface. z/890 has STI
ports installed in the book. These ports can be occupied by ICB cable or
by "STI cable" which connects STI port in the book with STI card. STI
card is easy to recognize, since it is half-height, two cards fit in one
slot.
So, we have two ends ot STI cable. One is STI port in the book, there's
always full set of them. The second is STI card. STI cards are inserted
when needed.
I don't know exact rule, when new STI card is required. However it
shouldn't be a problem because:
1. AFAIK you pay for the feature (FICON card), it doesn't matter whether
STI is also needed or not. You don't pay for that (to my knowledge).
2. It is unlikely that you reached limit of STI, and you don't have any
STI port available. Even then it is easy to check, just open the doors
and count it.
HTH
--
Radoslaw Skorupka
Lodz, Poland
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