[Lustre-discuss] Enqueue wait from MDS log

[Tung Dam]

Hi list

I have an issue with lustre log from our MDS, like this:
*
Jan  6 14:00:49 MDS1 kernel: Lustre:
19141:0:(ldlm_lockd.c:808:ldlm_server_completion_ast()) ### enqueue
waittook 164s from 1262761084 ns: mds-lustre-MDT0000_UUID lock:
ffff8101b6265a00/0x874ddc3670da987c lrc: 3/0,0 mode: PW/PW res:
28739811/1154690434 rrc: 3 type: FLK pid: 2393 [0->9223372036854775807]
flags: 0x0 remote: 0x49437cb8a7f893b2 expref: 7527 pid: 19134 timeout: 0
Jan  6 14:03:17 MDS1 kernel: Lustre:
19151:0:(ldlm_lockd.c:808:ldlm_server_completion_ast()) ### enqueue
waittook 165s from 1262761232 ns: mds-lustre-MDT0000_UUID lock:
ffff81000ce85000/0x874ddc3670df7804 lrc: 3/0,0 mode: PW/PW res:
28764612/1154727429 rrc: 3 type: FLK pid: 5802 [0->9223372036854775807]
flags: 0x0 remote: 0x49437cb8a7fc23d4 expref: 7618 pid: 19141 timeout: 0
Jan  6 14:56:09 MDS1 kernel: Lustre:
19146:0:(ldlm_lockd.c:808:ldlm_server_completion_ast()) ### enqueue
waittook 2292s from 1262762277 ns: mds-lustre-MDT0000_UUID lock:
ffff81001353c400/0x874ddc367109bb09 lrc: 3/0,0 mode: PW/PW res:
50663149/1154741605 rrc: 8 type: FLK pid: 14506 [0->9223372036854775807]
flags: 0x0 remote: 0x49437cb8a815133a expref: 13601 pid: 19127 timeout: 0
Jan  6 14:56:09 MDS1 kernel: Lustre:
19125:0:(ldlm_lockd.c:808:ldlm_server_completion_ast()) ### enqueue
waittook 2267s from 1262762302 ns: mds-lustre-MDT0000_UUID lock:
ffff81000a217200/0x874ddc36710b5802 lrc: 3/0,0 mode: PW/PW res:
50663149/1154741605 rrc: 3 type: FLK pid: 4363 [0->9223372036854775807]
flags: 0x0 remote: 0x49437cb8a815f26f expref: 13594 pid: 19129 timeout: 0
Jan  6 14:56:09 MDS1 kernel: Lustre:
19125:0:(ldlm_lockd.c:808:ldlm_server_completion_ast()) Skipped 4 previous
similar messages*

I repeated many times in many days. Maybe it's not really a problem because
our system is working ( just there's nothing goes down, but it seems like a
reduction in speed somewhere  ) and so, could anyone tell me what's the
meaning of these log messeages and how i could affect to our whole lustre
file system ?

Any help would be highly appreciated :)
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