Hi Rob,
Sorry for the late reply!
Correct, with a z14 you can use SMC-Dv1 only.
However, Clefos 7.9 is based (or identical to) RHEL 7.9 - which doesn't have SMC
support at all! :O To our credit, we did try to backport SMC to RHEL 7.x, but
the kernel was just too old, and the dependencies in the code were piling up way
too fast. So if if you want to stick with ClefOS/RHEL, you'd need a 8.x release!
As for the smc-tools release, I'd suggest to stick with whatever version your
distro provides. This is because most of the new features that a new smc-tools
release brings require kernel changes - which usually won't be there, or we
would have provided a more recent smc-tools version in the distro.
As for live guest relocation, as far as I know that plain won't work at all as
long as there's a PCI function attached to the guest. So you'd have to detach
the PCI function first, which would terminate any connection right away. Of
course, once migrated, you could start over (attach a PCI function, create new
connections, etc.), and that should work just fine.
Best regards,
Stefan Raspl
On 12/16/21 20:56, Hamilton, Robert wrote:
Thanks, Stefan!
Just installed Clefos 7.9.2009, did some yum updates, and uname says
3.10.0-1160.36.2.el7.s390x. We are on a z14 ZR1, so I'm thinking only SMC-Dv1
for us. And it works well among my z/OS systems.
I've found 5 or more releases of smc-tools out in the wild, the most recent
appears to be 1.7.0, which you released two months ago. Can't quite figure out
what or how to download, and the docs you recommended point to a 1.2.1-level
release.
Found I can't VMRELOCATE a Linux system that has a pcifunction attached. Does
the SMC and/or IP know while a socket is open that it has lost the pcifunction
and automatically revert to normal HiperSockets (or other IP) communication?
And after the VMRELOCATE completes, if a pcifunction is attached, can it
restart using SMC-D?
R;
Rob Hamilton
Infrastructure Engineer
Chemical Abstracts Service
-----Original Message-----
On 12/15/21 17:52, Hamilton, Robert wrote:
I have a newly-created ClefOS server on my z/VM system. I have attached
HiperSockets devices for each of my (5) HiperSockets networks. They are all
configured, and I can talk to each of my z/OS systems over the appropriate
HiperSockets networks.
I want to ensure that my client can use SMC-D when talking with the z/OS
applications on the same CPC. The z/OS systems already talk with each other
over HiperSockets using SMC-D, so I already have PCIFs setup in the IODF, and
can attach appropriate PCIFs to my new server.
Then what? I see I don't have smc-tools on the system anywhere, so I need to
get that and somehow make those available. I don't see my customer as wanting
to use AF-SMC-type socket connections, so I'm guessing I need to run his
application with smc-run...or...???
Presumably it's the same using SMC-D over OSAs, but I'll configure that bridge
when I come to it.
If you can tell me what I need next, or point me to the appropriate
documentation, I'd be most very grateful.
Hi Rob,
Yes, you can use smc_run to enable existing (binary) TCP applications to use
SMC-D. Which specific version of ClefOS are you on, and what are the levels of
the Linux kernel and smc-tools? If you have SMC-Dv1, check
http://www.vmworkshop.org/2019/present/linuxsmc.pdf, especially p21. If you
already have SMC-Dv2, check the presentation at
https://community.ibm.com/community/user/ibmz-and-linuxone/viewdocument/2021-07-15-boosting-tcp-networking?CommunityKey=c1293167-6d93-448e-8854-3068846d3dfe&tab=librarydocuments.
But, of course, I'll be glad to answer any questions, too!
Ciao,
Stefan
--
Mit freundlichen Grüßen / Kind regards
Stefan Raspl
Linux on Z
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