Decide whether to use pack-objects cache on file-hdd-*
In #954 (closed) we decided to not initially enable the pack-objects cache on the file-hdd-* Gitaly servers because they have a much lower maximum disk write throughput than our regular Gitaly servers.
This issue is for discussing and deciding what to do with the cache on file-hdd-*.
- Leave the cache disabled, and document this decision
- Enable the cache
Edited by Jacob Vosmaer