Hi, i do some test, to reproduce this problem.
As you can see, only one drive (each drive in same PG) is much more
utilize, then others, and there are some ops in queue on this slow
osd. This test is getting heads from s3 objects, alphabetically
sorted. This is strange. why this files is going in much part only
from this triple osd's.
checking what osd are in this pg.
ceph pg map 7.35b
osdmap e117008 pg 7.35b (7.35b) -> up [18,61,133] acting [18,61,133]
On osd.61
{ "num_ops": 13,
"ops": [
{ "description": "osd_sub_op(client.10376104.0:961532 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370134
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.448543",
"age": "0.032431",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376110.0:972570 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370135
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.453829",
"age": "0.027145",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376104.0:961534 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370136
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.454012",
"age": "0.026962",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376107.0:952760 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370137
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.458980",
"age": "0.021994",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376110.0:972572 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370138
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.459546",
"age": "0.021428",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376110.0:972574 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370139
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.463680",
"age": "0.017294",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376107.0:952762 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370140
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.464660",
"age": "0.016314",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376104.0:961536 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370141
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.468076",
"age": "0.012898",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376110.0:972576 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370142
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.468332",
"age": "0.012642",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376107.0:952764 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370143
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.470480",
"age": "0.010494",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376107.0:952766 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370144
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.475372",
"age": "0.005602",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376104.0:961538 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370145
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.479391",
"age": "0.001583",
"flag_point": "started"},
{ "description": "osd_sub_op(client.10376107.0:952768 7.35b
2b11a75b\/2013-03-06-13-8700.1-ocdn\/head\/\/7 [] v 117008'1370146
snapset=0=[]:[] snapc=0=[])",
"received_at": "2013-03-06 13:59:18.480276",
"age": "0.000698",
"flag_point": "started"}]}
On osd.18
{ "num_ops": 9,
"ops": [
{ "description": "osd_op(client.10391092.0:718883
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.929677",
"age": "0.025480",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10391092",
"tid": 718883}},
{ "description": "osd_op(client.10373691.0:956595
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.934533",
"age": "0.020624",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10373691",
"tid": 956595}},
{ "description": "osd_op(client.10391092.0:718885
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.937101",
"age": "0.018056",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10391092",
"tid": 718885}},
{ "description": "osd_op(client.10373691.0:956597
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.940284",
"age": "0.014873",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10373691",
"tid": 956597}},
{ "description": "osd_op(client.10373691.0:956598
2013-03-06-13-8700.1-ocdn [append 0~275] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.941170",
"age": "0.013987",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10373691",
"tid": 956598}},
{ "description": "osd_op(client.10373691.0:956601
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.946009",
"age": "0.009148",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10373691",
"tid": 956601}},
{ "description": "osd_op(client.10391092.0:718887
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.950400",
"age": "0.004757",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10391092",
"tid": 718887}},
{ "description": "osd_op(client.10373691.0:956603
2013-03-06-13-8700.1-ocdn [append 0~275] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.951217",
"age": "0.003940",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10373691",
"tid": 956603}},
{ "description": "osd_op(client.10373691.0:956604
2013-03-06-13-8700.1-ocdn [append 0~299] 7.2b11a75b)",
"received_at": "2013-03-06 13:57:52.951491",
"age": "0.003666",
"flag_point": "waiting for sub ops",
"client_info": { "client": "client.10373691",
"tid": 956604}}]}
iostat of this osd drives in same time. osd.61 is master i think.
osd.133
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sde 0.00 0.00 1.00 816.67 4.00 29925.50
73.21 0.24 0.28 6.67 0.27 0.19 15.33
osd.61
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdk 0.00 60.33 0.67 685.33 2.67 27458.83
80.06 1.48 2.16 54.00 2.11 1.45 99.47
osd.18
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdt 0.00 0.00 2.00 809.67 8.00 27608.00
68.05 0.19 0.23 12.00 0.20 0.14 11.33
Sort o files number of files with same date, but only a little probe of all.
57 21 Nov 2012
58 11 Dec 2012
59 02 Jan 2013
59 17 Feb 2013
64 16 Feb 2013
65 27 Nov 2012
66 14 Dec 2012
69 01 Mar 2013
71 07 Feb 2013
71 20 Dec 2012
71 30 Nov 2012
72 22 Nov 2012
74 23 Nov 2012
81 13 Dec 2012
88 01 Dec 2012
90 21 Feb 2013
113 16 Nov 2012
118 10 Feb 2013
120 13 Feb 2013
142 15 Feb 2013
158 19 Feb 2013
195 29 Nov 2012
200 14 Feb 2013
606 18 Feb 2013
766 20 Feb 2013
1347 05 Dec 2012
2439 09 Dec 2012
2603 08 Dec 2012
Other osd's have very small number of iops.
Best Regards
SS
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