Fwd: MDS memory usage is very high

[Daniel Carrasco <d.carrasco@xxxxxxxxx>]

Hello,

I've created a 3 nodes cluster with MON, MGR, OSD and MDS on all (2 MDS actives), and I've noticed that MDS is using a lot of memory (just now is using 12.5GB of RAM):

# ceph daemon mds.kavehome-mgto-pro-fs01 dump_mempools | jq -c '.mds_co'; ceph daemon mds.kavehome-mgto-pro-fs01 perf dump | jq '.mds_mem.rss'

{"items":9272259,"bytes":510032260}

12466648

I've configured the limit:

mds_cache_memory_limit = 536870912

But looks like is ignored, because is about 512Mb and is using a lot more.

Is there any way to limit the memory usage of MDS, because is giving a lot of troubles because start to swap.

Maybe I've to limit the cached inodes?

The other active MDS is using a lot less memory (2.5Gb). but also is using more than 512Mb. The standby MDS is not using memory it all.

I'm using the version:

ceph version 12.2.7 (3ec878d1e53e1aeb47a9f619c49d9e7c0aa384d5) luminous (stable).

Thanks!!

--

_________________________________________

      Daniel Carrasco Marín

      Ingeniería para la Innovación i2TIC, S.L.
      Tlf:  +34 911 12 32 84 Ext: 223
      www.i2tic.com
_________________________________________

--

_________________________________________

      Daniel Carrasco Marín

      Ingeniería para la Innovación i2TIC, S.L.
      Tlf:  +34 911 12 32 84 Ext: 223
      www.i2tic.com
_________________________________________

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