Hi, Eugen,
I set mds_cache_memory_limit from 1G to 2G, and then to 4G. I still get the warning
messages, and the messages would disappear in 1 or 2 minutes.
Which version do your kernels use?
Zhenshi Zhou <deaderzzs@xxxxxxxxx> 于2018年8月13日周一 下午10:15写道：
Hi Eugen,The command shows "mds_cache_memory_limit": "1073741824".And I'll increase the cache size for a try.ThanksEugen Block <eblock@xxxxxx> 于2018年8月13日周一 下午9:48写道：Hi,
Depending on your kernel (memory leaks with CephFS) increasing the
mds_cache_memory_limit could be of help. What is your current setting
now?
ceph:~ # ceph daemon mds.<MDS> config show | grep mds_cache_memory_limit
We had these messages for months, almost every day.
It would occur when hourly backup jobs ran and the MDS had to serve an
additional client (searching the whole CephFS for changes) besides the
existing CephFS clients. First we updated all clients to a more recent
kernel version, but the warnings didn't stop. Then we doubled the
cache size from 2 GB to 4 GB last week and since then I haven't seen
this warning again (for now).
Try playing with the cache size to find a setting fitting your needs,
but don't forget to monitor your MDS in case something goes wrong.
Regards,
Eugen
Zitat von Wido den Hollander <wido@xxxxxxxx>:
> On 08/13/2018 01:22 PM, Zhenshi Zhou wrote:
>> Hi,
>> Recently, the cluster runs healthy, but I get warning messages everyday:
>>
>
> Which version of Ceph? Which version of clients?
>
> Can you post:
>
> $ ceph versions
> $ ceph features
> $ ceph fs status
>
> Wido
>
>> 2018-08-13 17:39:23.682213 [INF] Cluster is now healthy
>> 2018-08-13 17:39:23.682144 [INF] Health check cleared:
>> MDS_CLIENT_RECALL (was: 6 clients failing to respond to cache pressure)
>> 2018-08-13 17:39:23.052022 [INF] MDS health message cleared (mds.0):
>> Client docker38:docker failing to respond to cache pressure
>> 2018-08-13 17:39:23.051979 [INF] MDS health message cleared (mds.0):
>> Client docker73:docker failing to respond to cache pressure
>> 2018-08-13 17:39:23.051934 [INF] MDS health message cleared (mds.0):
>> Client docker74:docker failing to respond to cache pressure
>> 2018-08-13 17:39:23.051853 [INF] MDS health message cleared (mds.0):
>> Client docker75:docker failing to respond to cache pressure
>> 2018-08-13 17:39:23.051815 [INF] MDS health message cleared (mds.0):
>> Client docker27:docker failing to respond to cache pressure
>> 2018-08-13 17:39:23.051753 [INF] MDS health message cleared (mds.0):
>> Client docker27 failing to respond to cache pressure
>> 2018-08-13 17:38:11.100331 [WRN] Health check update: 6 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:37:39.570014 [WRN] Health check update: 5 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:37:31.099418 [WRN] Health check update: 3 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:36:34.564345 [WRN] Health check update: 1 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:36:27.121891 [WRN] Health check update: 3 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:36:11.967531 [WRN] Health check update: 5 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:35:59.870055 [WRN] Health check update: 6 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:35:47.787323 [WRN] Health check update: 3 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:34:59.435933 [WRN] Health check failed: 1 clients failing
>> to respond to cache pressure (MDS_CLIENT_RECALL)
>> 2018-08-13 17:34:59.045510 [WRN] MDS health message (mds.0): Client
>> docker75:docker failing to respond to cache pressure
>>
>> How can I fix it?
>>
>>
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@xxxxxxxxxxxxxx
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
> _______________________________________________
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