This is an updated version of Joe L.'s cache_dirs sript for caching directories in memory to prevent unnecessary disk drive spinup. Thank you Alex R. Berg for your updates to cache_dirs.

Version 2.1.1

• Removed additional unused variables.
• Removed V5 ulimit usage info that doesn't apply.
• Show type of scanning being done - adaptive or fixed when cache_dirs is started.

Version 2.1.0

• Removed code specific to V5, removed wait for array to come online, removed force disks busy, and modified script for readability.

Version 2.0.6

• Included original 'B' option, it is unused but kept for compatibility reasons. This was done for the Dynamix Cache Dirs plugin.

VVersion 2.0.5

• Updated for unRaid 6.1.2 new location of mdcmd (used to find idle-times of disks).

Version 2.0.4

• Added more lost cache log, enabled by creating log file /var/log/cache_dirs_lost_cache.log.

Version 2.0.3

• Bugfix suspend mover, and added concise log of lost cache.

Version 2.0.2

• Fixed looping bash check in unRaid V6, plus fixed some too aggressive depth checks.

Version 2.0.1

• Fixed missing sleep. Now decreases scan-depth after few seconds (20-40s) if cache is lost after many successful cache-hits, because we don't want cache_dirs to be a resource-hog when system is otherwise occupied.

Version 2.0.0

• Added gradual depth to avoid continous scans of filesystem, monitor of disk-idle, and better user-feedback as to disk spin-up in log-file.

• Now stops cache_dirs immediately on stop signal (eg array stop) including stopping the currently running find-process.

• Force-disk-busy now defaults no and inverted flag (and changed -B to -b) because it was (mostly) unRaid V4 and its unnessary when using plg with unmount disk event.