Hello,
Finally I've to remove CephFS and use a simple NFS, because the MDS daemon
starts to use a lot of memory and is unstable. After reboot one node
because it started to swap (the cluster will be able to survive without a
node), the cluster goes down because one of the other MDS starts to use
about 15Gb of RAM and crash all the time, so the cluster is unable to come
back. The only solution is to reboot all nodes and is not good for HA.
If somebody knows something about this, I'll be pleased to test it on a
test environment to see if we can find a solution.
Greetings!
2018-07-19 1:07 GMT+02:00 Daniel Carrasco <d.carra...@i2tic.com>:
> Thanks again,
>
> I was trying to use fuse client instead Ubuntu 16.04 kernel module to see
> if maybe is a client side problem, but CPU usage on fuse client is very
> high (a 100% and even more in a two cores machine), so I'd to rever to
> kernel client that uses much less CPU.
>
> Is a web server, so maybe the problem is that. PHP and Nginx should open a
> lot of files and maybe that uses a lot of RAM.
>
> For now I've rebooted the machine because is the only way to free the
> memory, but I cannot restart the machine every few hours...
>
> Greetings!!
>
> 2018-07-19 1:00 GMT+02:00 Gregory Farnum <gfar...@redhat.com>:
>
>> Wow, yep, apparently the MDS has another 9GB of allocated RAM outside of
>> the cache! Hopefully one of the current FS users or devs has some idea. All
>> I can suggest is looking to see if there are a bunch of stuck requests or
>> something that are taking up memory which isn’t properly counted.
>>
>> On Wed, Jul 18, 2018 at 3:48 PM Daniel Carrasco <d.carra...@i2tic.com>
>> wrote:
>>
>>> Hello, thanks for your response.
>>>
>>> This is what I get:
>>>
>>> # ceph tell mds.kavehome-mgto-pro-fs01 heap stats
>>> 2018-07-19 00:43:46.142560 7f5a7a7fc700 0 client.1318388
>>> ms_handle_reset on 10.22.0.168:6800/1129848128
>>> 2018-07-19 00:43:46.181133 7f5a7b7fe700 0 client.1318391
>>> ms_handle_reset on 10.22.0.168:6800/1129848128
>>> mds.kavehome-mgto-pro-fs01 tcmalloc heap stats:------------------------
>>> ------------------------
>>> MALLOC: 9982980144 ( 9520.5 MiB) Bytes in use by application
>>> MALLOC: + 0 ( 0.0 MiB) Bytes in page heap freelist
>>> MALLOC: + 172148208 ( 164.2 MiB) Bytes in central cache freelist
>>> MALLOC: + 19031168 ( 18.1 MiB) Bytes in transfer cache freelist
>>> MALLOC: + 23987552 ( 22.9 MiB) Bytes in thread cache freelists
>>> MALLOC: + 20869280 ( 19.9 MiB) Bytes in malloc metadata
>>> MALLOC: ------------
>>> MALLOC: = 10219016352 ( 9745.6 MiB) Actual memory used (physical + swap)
>>> MALLOC: + 3913687040 ( 3732.4 MiB) Bytes released to OS (aka unmapped)
>>> MALLOC: ------------
>>> MALLOC: = 14132703392 (13478.0 MiB) Virtual address space used
>>> MALLOC:
>>> MALLOC: 63875 Spans in use
>>> MALLOC: 16 Thread heaps in use
>>> MALLOC: 8192 Tcmalloc page size
>>> ------------------------------------------------
>>> Call ReleaseFreeMemory() to release freelist memory to the OS (via
>>> madvise()).
>>> Bytes released to the OS take up virtual address space but no physical
>>> memory.
>>>
>>>
>>> I've tried the release command but it keeps using the same memory.
>>>
>>> greetings!
>>>
>>>
>>> 2018-07-19 0:25 GMT+02:00 Gregory Farnum <gfar...@redhat.com>:
>>>
>>>> The MDS think it's using 486MB of cache right now, and while that's
>>>> not a complete accounting (I believe you should generally multiply by
>>>> 1.5 the configured cache limit to get a realistic memory consumption
>>>> model) it's obviously a long way from 12.5GB. You might try going in
>>>> with the "ceph daemon" command and looking at the heap stats (I forget
>>>> the exact command, but it will tell you if you run "help" against it)
>>>> and seeing what those say — you may have one of the slightly-broken
>>>> base systems and find that running the "heap release" (or similar
>>>> wording) command will free up a lot of RAM back to the OS!
>>>> -Greg
>>>>
>>>> On Wed, Jul 18, 2018 at 1:53 PM, Daniel Carrasco <d.carra...@i2tic.com>
>>>> wrote:
>>>> > 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
>>>> > _________________________________________
>>>> >
>>>> > _______________________________________________
>>>> > ceph-users mailing list
>>>> > ceph-users@lists.ceph.com
>>>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>> >
>>>>
>>>
>>>
>>>
>>> --
>>> _________________________________________
>>>
>>> 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
> _________________________________________
>
--
_________________________________________
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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