> I’ve missed this thread.
He first said 1536 ports (not slots, not lanes) on a full z16. I asked
where he got that number. Response was there are 12 fanout slots on a
CEC drawer (true), so with 4 CEC drawers that's 48 fanout slots (true)
which means the 4 CEC drawers could address 48 I/O drawers with 16 cards
each and 2 ports per card = 1536 ports.
So I pointed out there's only 12 I/O drawers max on a z16 which is 12 x
16 = 192 slots or 384 ports max. He replied, but didn't seem to fully
accept that answer.
Later he said there are 1600 slots (not ports, not lanes) on a z16 so I
asked where he got that new number. He said he meant 1536 slots (not
ports, not lanes) so the number doubled from last time. I replied same
as I did previously.
Below, he said 1536 slots again. 1536 cards on a single z16 could be
over 3000 cables! I've had to untangle some 150+ cable rats nests, but
for that one I'd just say, Naw... I'm going home :)
On 8/2/2023 1:53 AM, David Crayford wrote:
On 2 Aug 2023, at 12:15 pm, Tom Brennan <[email protected]> wrote:
The IBM z16 can have up to 1,536 PCIe+ slots
I'm gonna quit explaining this and just say, "WRONG" every time you say this as
if it's a fact :)
I’ve missed this thread. By 1,536 PCIe slots, that’s slots not lanes right?
Even if it were lanes that would be a ludicrous suggestions! That’s so far
fetched it’s laughable. The Redbook [1] is quite clear about I/O
configurations. What I find interesting is that the z16 seems to use PCIe gen 3
and not gen 4 which doubles the transfer rate per lane. There must be a good
technical reason for this.
[1] https://www.redbooks.ibm.com/redbooks/pdfs/sg248951.pdf
On 8/1/2023 8:01 PM, Jon Perryman wrote:
> On Tuesday, August 1, 2023 at 05:20:33 PM PDT, David Crayford
<[email protected]> wrote:
What’s the difference between between channelized I/O and a rack of
x86 servers connected to a SAN using fibre channel driven by high speed HBAs?
PCIe was created specifically for PCs and IBM z16 chose to use that as their
only channel technology. Channelized I/O for PC has been available for several
decades and is not limited to PCIe. The IBM z16 can have up to 1,536 PCIe+
slots.
As for x86 fiber channel connection to a PC, PCIe is only one possibility.
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