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docs: add more details to -cacheDataPath vmselect flag (#6708)

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vmselect will create `./tmp` dir under `cacheDataPath`. If
`cacheDataPath` is set to `/`, vmselect will use `/tmp`.

content under `/tmp` dir might be auto removed based on the OS
behaviour. See:
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5770

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

---------

Signed-off-by: hagen1778 <roman@victoriametrics.com>
Co-authored-by: hagen1778 <roman@victoriametrics.com>
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Zhu Jiekun 2024-08-13 21:17:43 +08:00 committed by Aliaksandr Valialkin
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docs/Cluster-VictoriaMetrics.md
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@ -56,6 +56,8 @@ It increases cluster availability, and simplifies cluster maintenance as well as
![Cluster Scheme](Cluster-VictoriaMetrics_cluster-scheme.webp) ![Cluster Scheme](Cluster-VictoriaMetrics_cluster-scheme.webp)
> Note that `vmselect` despite being stateless still requires some disk space (a few GBs) for temporary caches. Refer to the `-cacheDataPath` command-line flag for more details.
## Multitenancy ## Multitenancy
VictoriaMetrics cluster supports multiple isolated tenants (aka namespaces). VictoriaMetrics cluster supports multiple isolated tenants (aka namespaces).
@ -1308,7 +1310,7 @@ Below is the output for `/path/to/vmselect -help`:
-blockcache.missesBeforeCaching int -blockcache.missesBeforeCaching int
The number of cache misses before putting the block into cache. Higher values may reduce indexdb/dataBlocks cache size at the cost of higher CPU and disk read usage (default 2) The number of cache misses before putting the block into cache. Higher values may reduce indexdb/dataBlocks cache size at the cost of higher CPU and disk read usage (default 2)
-cacheDataPath string -cacheDataPath string
Path to directory for cache files. By default, the cache is not persisted. Path to directory for cache files and temporary query results. By default, the cache won't be persisted, and temporary query results will be placed under /tmp/searchResults. If set, the cache will be persisted under cacheDataPath/rollupResult, and temporary query results will be placed under cacheDataPath/tmp/searchResults.
-cacheExpireDuration duration -cacheExpireDuration duration
Items are removed from in-memory caches after they aren't accessed for this duration. Lower values may reduce memory usage at the cost of higher CPU usage. See also -prevCacheRemovalPercent (default 30m0s) Items are removed from in-memory caches after they aren't accessed for this duration. Lower values may reduce memory usage at the cost of higher CPU usage. See also -prevCacheRemovalPercent (default 30m0s)
-cluster.tls -cluster.tls