It is possible, or most likely very probable, that HMC to SE traffic goes out to the switch and back. I really don’t know, nor have I had the network folks trace it or asked IBM to verify this.
The point I was trying to make is that there is no dedicated cable that loops between two ports on the HMAs so that the SE and HMC on that HMA can communicate with each other. All cables that plug into the HMA have the other ends of the cables all plugged into network switches. Tom Chicklon Fifth Third Bank From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Tom Brennan Sent: Wednesday, December 18, 2024 2:09 PM To: [email protected] Subject: Re: z16 HMC LAN connections I'm a little confused. You said no cabling was required between HMC and SE functions on an HMA. But then you said you have 4 cables in each HMA - 2 for SE and 2 for HMC, I assume to switches where they can talk to each other. Personally, I was under the impression the cables are required and that you can't do a virtual IP connection between HMC and SE in an HMA. But that's just my impression - I never asked IBM about it. On 12/18/2024 10:18 AM, Chicklon, Thomas wrote: > Each of our z16s required 10 copper connections spread across 2 separate LANs > / switches. > > A1: Our z16s came with 2 HMAs (Hardware Management Appliance) in each z16, > each redundantly takes care of the SE and HMC functions. As before there are > two separate SEs, and now there are two HMCs for each z16. No cabling was > required for connectivity between HMC and SE functions in a single HMA. > > A2: Each of our z16s has 10 copper network connections. Two for each of the > HMCs (4 total), two for each of the SEs (4 total), and two additional for ETS > ports assuming you are using an external time server. These ports are not in > either of the HMAs, they are totally separate. Note that this functions used > to be in the HMCs. I have a diagram I got from IBM that shows these 10 > connections on the z16 and which network they get plugged into. > > A3: We can see all of our z16s from all of our HMCs, even though they ae > spread across multiple sites. One of each of the HMC connections is to your > intranet, and the IBM SSR made the definitions in the HMCs. > > > Tom Chicklon > Fifth Third Bank > > > This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
