Dear all, I use raid 6 deployment ceph. I have 1 SSD partition (raid 0). I use SSD make journal for OSD.
Raid 6 containt 60TB, divided into 4 OSD.. When I deploy, OSD usually reflects the slow request. 001080 [write 0~4194304 [5@0]] 0.72bf90bf snapc 1=[]) v4 currently commit sent 2013-05-08 10:56:25.617376 osd.5 [WRN] slow request 40.220838 seconds old, received at 2013-05-08 10:55:45.396435: osd_op(client.32118.1:23397 10000253cb9.00001083 [write 0~4194304 [5@0]] 0.10e44e90 snapc 1=[]) v4 currently commit sent 2013-05-08 10:56:25.617379 osd.5 [WRN] slow request 40.073943 seconds old, received at 2013-05-08 10:55:45.543330: osd_op(client.32118.1:23409 10000253cb9.0000108e [write 0~4194304 [5@0]] 0.d42b5452 snapc 1=[]) v4 currently commit sent 2013-05-08 10:56:26.617605 osd.5 [WRN] 5 slow requests, 1 included below; oldest blocked for > 41.528346 secs 2013-05-08 10:56:26.617614 osd.5 [WRN] slow request 40.935174 seconds old, received at 2013-05-08 10:55:45.682338: osd_op(client.32118.1:23414 10000253cb9.00001093 [write 0~4194304 [5@0]] 0.9543dc39 snapc 1=[]) v4 currently commit sent 2013-05-08 10:56:27.617784 osd.5 [WRN] 6 slow requests, 2 included below; oldest blocked for > 42.371566 secs 2013-05-08 10:56:27.617789 osd.5 [WRN] slow request 40.425833 seconds old, received at 2013-05-08 10:55:47.191899: osd_sub_op(osd.7.0:6648 0.d6 6bf7cbd6/10000253cd2.00000060/head//0 [push] v 5203'39393 snapset=0=[]:[] snapc=0=[]) v7 currently no flag points reached I user kernel 3.9.0 for Centos, ceph 0.56.4 I do not know the cause and I can not fix it. Please help me!
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