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| author | Promise Akpan <akpanpromise@hotmail.com> | 2019-08-15 12:06:39 +0100 |
|---|---|---|
| committer | Chris Akritidis <43294513+cakrit@users.noreply.github.com> | 2019-08-15 13:06:39 +0200 |
| commit | f5006d51e8caf9148d393eb68d53dc9fcd28b7b6 (patch) | |
| tree | 03b757236d6b45e46813a4a875c77dc775e5f896 /database/engine | |
| parent | 69172fd57472df75d877f43de2dcc693c48ab5c0 (diff) | |
Fix Markdown Lint warnings (#6664)
* make remark access all directories
* detailed fix after autofix by remark lint
* cross check autofix for this set of files
* crosscheck more files
* crosschecking and small fixes
* crosscheck autofixed md files
Diffstat (limited to 'database/engine')
| -rw-r--r-- | database/engine/README.md | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/database/engine/README.md b/database/engine/README.md index 441a3eea05..eb6d5a3c54 100644 --- a/database/engine/README.md +++ b/database/engine/README.md @@ -18,14 +18,14 @@ journalfile-1-0000000002.njf datafile-1-0000000003.ndf journalfile-1-0000000003.njf ... -``` +``` They are located under their host's cache directory in the directory `./dbengine` (e.g. for localhost the default location is `/var/cache/netdata/dbengine/*`). The higher numbered filenames contain more recent metric data. The user can safely delete some pairs of files when Netdata is stopped to manually free up some space. -*Users should* **back up** *their `./dbengine` folders if they consider this data to be important.* +_Users should_ **back up** _their `./dbengine` folders if they consider this data to be important._ ## Configuration @@ -94,14 +94,14 @@ is much larger than the available memory. There are explicit memory requirements **per** DB engine **instance**, meaning **per** Netdata **node** (e.g. localhost and streaming recipient nodes): -- `page cache size` must be at least `#dimensions-being-collected x 4096 x 2` bytes. +- `page cache size` must be at least `#dimensions-being-collected x 4096 x 2` bytes. -- an additional `#pages-on-disk x 4096 x 0.03` bytes of RAM are allocated for metadata. +- an additional `#pages-on-disk x 4096 x 0.03` bytes of RAM are allocated for metadata. - - roughly speaking this is 3% of the uncompressed disk space taken by the DB files. + - roughly speaking this is 3% of the uncompressed disk space taken by the DB files. - - for very highly compressible data (compression ratio > 90%) this RAM overhead - is comparable to the disk space footprint. + - for very highly compressible data (compression ratio > 90%) this RAM overhead + is comparable to the disk space footprint. An important observation is that RAM usage depends on both the `page cache size` and the `dbengine disk space` options. @@ -128,18 +128,24 @@ LimitNOFILE=65536 ``` For other types of services one can add the line: + ``` ulimit -n 65536 ``` + at the beginning of the service file. Alternatively you can change the system-wide limits of the kernel by changing `/etc/sysctl.conf`. For linux that would be: + ``` fs.file-max = 65536 ``` + In FreeBSD and OS X you change the lines like this: + ``` kern.maxfilesperproc=65536 kern.maxfiles=65536 ``` + You can apply the settings by running `sysctl -p` or by rebooting. -[]() +[](<>) |