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?
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