Peer cache and InPlace Upgrade, supposed to work ?

Question

Is the action "Upgrade operating system" can use the peer cache ?

In my TS, action like "install software" will download the sotfware from the peer source (MTGG) but at the Upgrade step, the Upgrade package files are downloaded from distribution point and not from the peer source. The peer source have the package in ccm\cache

I modified my TS by adding the "download content" step before the step "upgrade operating system" to see if it will download from peer source, but no, same thing, download from distribution point

variable SMSTPeerDownload=true is set

in my smsts.log:

Answer 1

@Jonathan
Here is an answer to your question that hopefully you find helpful!
There are some limitations for a client to access to a peer cache source and please also help check them. A peer cache source rejects requests for content when it meets any of the following conditions at the time a peer requests content:

1)Low battery mode
2)Processor load exceeds 80%
3)Disk I/O has an AvgDiskQueueLength that exceeds 10
4)There are no more available connections to the computer
5)We need consider the size of larger content such as OS upgrade packages. We could compare our need for this content against the available disk space on peer cache sources.

Here are some articles for reference:
https://learn.microsoft.com/en-us/mem/configmgr/core/plan-design/hierarchy/client-peer-cache#guidance-for-cache-management

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Answer 2

Yup, supported during PE phase.
https://learn.microsoft.com/en-us/mem/configmgr/osd/get-started/prepare-windows-pe-peer-cache-to-reduce-wan-traffic