Introducing WinPE Peer Cache

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WinPE Peer Cache is a new feature of SCCM CB 1610. It functions in a similar manner to BranchCache however, it is only available for content access from the Windows Preinstallation Environment (WinPE). WinPE Peer cache is configured and managed as part of the SCCM CB client management settings.

A task sequence configured to use Windows PE Peer Cache can get the following content objects from a local peer while running in Windows PE:

  1. Operating system image
  2. Driver package
  3. Packages and Programs (When the client continues to run the task sequence in the full operating system, the client gets this content from a peer cache source if the task sequence was originally configured for peer cache when running in Windows PE.)
  4. Additional boot images

It is important to understand that WinPE Peer Cache is targeted at OSD scenarios and does not replace Distribution Points and BranchCache as locations for other types of content. For example, the following content objects never transfer using peer cache. Instead, they transfer from a distribution point or by Windows BranchCache if you have configured Windows BranchCache in your environment:

  1. Applications
  2. Software updates

WinPE Peer Cache only supports OSD scenarios that include a WinPE boot such as PXE boot or Boot Media.

WinPE Peer Cache is very new and is evolving very rapidly. To avoid possible issues with the model, Microsoft is adding features to create higher deployment success rates. Beginning with SCCM CB 1702, a peer cache source computer will reject a request for content when the peer cache source computer meets any of the following conditions:

  1. Is in low battery mode.
  2. CPU load exceeds 80% at the time the content is requested.
  3. Disk I/O has an AvgDiskQueueLength that exceeds 10.
  4. There are no more available connections to the computer.
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