Hello guys,
>From time to time I have MDS cache pressure error (Client failing to respond
to cache pressure).
If I try to increase the mds_cache_size to increase the number of inodes two
things happen:
1) inodes keep growing until I get to the limit again
2) the more inodes, mds runs out of memory and gets killed by the OS, swaps
to the failover mds.
I have two mds, each with 12gb of ram. Running on a VM.
root@mds01:~# ceph daemon mds.mds01 perf dump | head -n 30
{
"mds": {
"request": 44328985,
"reply": 44328983,
"reply_latency": {
"avgcount": 44328983,
"sum": 155060.386784153
},
"forward": 0,
"dir_fetch": 52149,
"dir_commit": 7306,
"dir_split": 0,
"inode_max": 3000000,
"inodes": 2884302,
"inodes_top": 1191759,
"inodes_bottom": 485982,
"inodes_pin_tail": 1206561,
"inodes_pinned": 2398701,
"inodes_expired": 187542007,
"inodes_with_caps": 2395109,
"caps": 2395110,
"subtrees": 2,
"traverse": 44376013,
"traverse_hit": 44305134,
"traverse_forward": 0,
"traverse_discover": 0,
"traverse_dir_fetch": 22494,
"traverse_remote_ino": 0,
"traverse_lock": 0,
"load_cent": 4434414393,
Any idea how can I overcome this problem?
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