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Following points discussed with mgriessmeier:

1. Moving around machines in PRG2-J11 to pack the rack 100% sounds like a lot of effort and will only be a time-limited solution because sooner or later we need to add or change something again so I recommend against doing that
2. legolas might be moved because it’s not used in openqa.suse.de directly, same as huckleberry, soapberry, blackcurrant, cloudberry but that would mean we need access to the HMC powerhmc1.oqa.prg2.suse.org OR a separate HMC as requested in https://jira.suse.com/browse/ENGINFRA-3764 . If an HMC can be provided in PRG2e then I see no problem to move those machines to PRG2e. haldir should not be moved as it’s currently used in openqa.suse.de
3. If access to powerhmc1.oqa.prg2.suse.org can be provided or the separate HMC can be provided in PRG2e then the easiest for now would be to place the new Power10 machine in PRG2e however that would be less consistent as then more “production” oqa.prg2.suse.org machines would be in PRG2e whereas non-oqa.prg2.suse.org machines would be in PRG2
4. It would be preferred to have “production”-load in PRG2 meaning we need more space in PRG2. Generally we are flexible where in PRG2 that would be.
5. You could also put machines into the neighboring rack J12, reserved for openqa.opensuse.org, but only if there are no further restrictions from IT. For this keep in mind that machines in J12 are in a dedicated DMZ network so not part of SUSE internal networks. One could either just put machines in J12 and still connect to the switch in J11, a bit messy, or configure the switch in J12 to serve multiple networks, also a bit messy and potentially insecure if one is not careful with configuration
6. Maybe there is also other space in PRG2 that can be used and easier to connect to than PRG2e, e.g. J5 which is currently empty, or move the content from J10, the openSUSE rack, to have a neighboring rack for similar purpose

the problem of physical space is also related to #153736 which is about nessberry that "should" go to J11 but does not have enough free space.

In #132140-4 I took notes regarding the original plan to put PowerPC machines in PRG2 for now

Meeting with jford, mcaj, horon, mgriessmeier, gpfuetzenreuter. We decided into which racks the PowerPC in PRG2 should go. There are two racks planned for LSG QE: PRG2-J11 for QE&openqa.suse.de, PRG2-J12 for openqa.opensuse.org […] no specific place was planned within the QE/openQA racks so far but we have some space available so we planned all those PowerPC machines to go to PRG2-J11 as well. If there is not enough space those machines can move to other spare racks based on consideration by Eng-Infra

Regarding that one should also consider that at this time, 2023-07-07, there were no plans regarding PRG2e yet and NUE3 was planned to be a viable hot redundant datacenter. After those plans changed it was decided to move more PowerPC machines to PRG2/PRG2e.

One more idea: We are currently using only 17 HEs in PRG2e in https://racktables.nue.suse.com/index.php?page=rack&rack_id=24562 plus estimated 2 HE for new Power10 would be 19 HEs. Maybe the easiest solution for all would be to move 19 HEs to PRG2 if IT can provide the space.