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Clarify tmpfs and shm in installation docs (#7551)

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* Update installation.md

* Update docs/docs/frigate/installation.md

Name specific endpoints

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Update installation.md

shorten `tmpfs` mention

* Update docs/docs/frigate/installation.md

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>
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docs/docs/frigate/installation.md
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@ -25,8 +25,8 @@ Frigate uses the following locations for read/write operations in the container.
- `/media/frigate/clips`: Used for snapshot storage. In the future, it will likely be renamed from `clips` to `snapshots`. The file structure here cannot be modified and isn't intended to be browsed or managed manually.
- `/media/frigate/recordings`: Internal system storage for recording segments. The file structure here cannot be modified and isn't intended to be browsed or managed manually.
- `/media/frigate/exports`: Storage for clips and timelapses that have been exported via the WebUI or API.
- `/tmp/cache`: Cache location for recording segments. Initial recordings are written here before being checked and converted to mp4 and moved to the recordings folder.
- `/dev/shm`: It is not recommended to modify this directory or map it with docker. This is the location for raw decoded frames in shared memory and it's size is impacted by the `shm-size` calculations below.
- `/tmp/cache`: Cache location for recording segments. Initial recordings are written here before being checked and converted to mp4 and moved to the recordings folder. Segments generated via the `clip.mp4` endpoints are also concatenated and processed here. It is recommended to use a [`tmpfs`](https://docs.docker.com/storage/tmpfs/) mount for this.
- `/dev/shm`: Internal cache for raw decoded frames in shared memory. It is not recommended to modify this directory or map it with docker. The minimum size is impacted by the `shm-size` calculations below.
#### Common docker compose storage configurations
@ -51,7 +51,7 @@ services:
Frigate utilizes shared memory to store frames during processing. The default `shm-size` provided by Docker is **64MB**.
The default shm size of **64MB** is fine for setups with **2 cameras** detecting at **720p**. If Frigate is exiting with "Bus error" messages, it is likely because you have too many high resolution cameras and you need to specify a higher shm size.
The default shm size of **64MB** is fine for setups with **2 cameras** detecting at **720p**. If Frigate is exiting with "Bus error" messages, it is likely because you have too many high resolution cameras and you need to specify a higher shm size, using [`--shm-size`](https://docs.docker.com/engine/reference/run/#runtime-constraints-on-resources) (or [`service.shm_size`](https://docs.docker.com/compose/compose-file/compose-file-v2/#shm_size) in docker-compose).
The Frigate container also stores logs in shm, which can take up to **30MB**, so make sure to take this into account in your math as well.