Charles Cooke
2013-May-28 00:20 UTC
[Gluster-users] GlusterFS (3.3.1) - performance issues - large number of LOOKUP calls & high CPU usage
Hi,
We are currently attempting to use GlusterFS but are encountering
significant performance issues in our environment. The symptoms we are
seeing are that read/write performance degrades and the glusterfsd
eventually takes up to 100% of the CPU.
We currently run in a simple 1x2 replicated configuration. The I/O
primarily consists of write operations, with a smaller amount of reads.
What we see consistently on profiling is that the LOOKUP calls are
consistently taking the majority of the time. I am not sure what this
represents - but the ordinality seems to be out of whack - eg. when several
dozen read/write operations are taking place, there will be several
thousand LOOKUP calls.
Following the discussion in the IRC Archives - there was some indication
that our symptoms (large number of LOOKUP calls) were the result of
self-heal checks and/or DHT misses as per:
http://irclog.perlgeek.de/gluster/2012-11-28
--> JoeJulian Well, that's either self-heal checks and/or dht misses.
So we've disabled the self-heal daemon and turned lookup-unhashed off. But
this hasn't had an impact on the performance either way. The volume
information is shown below along with volume profiling information.
Volume Name: gluster
Type: Replicate
Volume ID: 08cb1e95-1f56-449c-b427-8f1921371d5a
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: stg100mol1-int.coupahost.com:/mnt/gluster/export
Brick2: stg100mol2-int.coupahost.com:/mnt/gluster/export
Options Reconfigured:
performance.cache-size: 2000000000
performance.cache-refresh-timeout: 0
geo-replication.indexing: off
diagnostics.latency-measurement: on
diagnostics.count-fop-hits: on
cluster.self-heal-daemon: off
cluster.lookup-unhashed: off
Brick: stg100mol1-int.coupahost.com:/mnt/gluster/export
-------------------------------------------------------
Cumulative Stats:
Block Size: 1b+ 2b+
4b+
No. of Reads: 0 0
0
No. of Writes: 98 8
69
Block Size: 8b+ 16b+
32b+
No. of Reads: 0 0
0
No. of Writes: 125 43
7
Block Size: 64b+ 128b+
256b+
No. of Reads: 3 0
18
No. of Writes: 154 620
262
Block Size: 512b+ 1024b+
2048b+
No. of Reads: 27 68
14
No. of Writes: 373 86
60
Block Size: 4096b+ 8192b+
16384b+
No. of Reads: 0 6
14
No. of Writes: 11957 2398
6
Block Size: 32768b+ 65536b+
131072b+
No. of Reads: 17 65
149
No. of Writes: 7 0
0
%-latency Avg-latency Min-Latency Max-Latency No. of calls
Fop
--------- ----------- ----------- ----------- ------------
----
0.00 0.00 us 0.00 us 0.00 us 712
FORGET
0.00 0.00 us 0.00 us 0.00 us 5789
RELEASE
0.00 0.00 us 0.00 us 0.00 us 5896
RELEASEDIR
0.00 86.33 us 52.00 us 137.00 us 3
GETXATTR
0.00 1045.00 us 1045.00 us 1045.00 us 1
RMDIR
0.00 156.98 us 32.00 us 1272.00 us 41
FTRUNCATE
0.00 572.24 us 212.00 us 3865.00 us 49
MKDIR
0.01 135.47 us 36.00 us 6126.00 us 471
TRUNCATE
0.01 160.58 us 14.00 us 5641.00 us 470
STAT
0.03 517.82 us 38.00 us 163774.00 us 471
SETATTR
0.07 1445.84 us 25.00 us 97172.00 us 396
READ
0.07 401.11 us 13.00 us 33647.00 us 1449
READDIR
0.10 3617.81 us 111.00 us 237368.00 us 221
STATFS
0.10 8252.17 us 14.00 us 406281.00 us 99
LK
0.10 1161.94 us 162.00 us 263151.00 us 709
CREATE
0.12 2204.37 us 79.00 us 175090.00 us 457
RENAME
0.13 1084.25 us 84.00 us 487294.00 us 942
XATTROP
0.24 336.51 us 23.00 us 753796.00 us 5896
OPENDIR
0.25 343.05 us 25.00 us 267306.00 us 5951
OPEN
0.26 763.13 us 12.00 us 498524.00 us 2729
INODELK
0.26 518.81 us 11.00 us 574717.00 us 4100
ENTRYLK
0.27 5757.93 us 65.00 us 266003.00 us 377
UNLINK
0.28 141.80 us 25.00 us 33487.00 us 16273
WRITE
0.38 303.52 us 12.00 us 905949.00 us 10244
FSTAT
0.88 14109.27 us 1733.00 us 574868.00 us 505
FSYNC
2.17 1793.98 us 7.00 us 1341172.00 us 9841
FLUSH
3.17 788.24 us 66.00 us 925523.00 us 32627
FXATTROP
13.92 7132.57 us 55.00 us 735763.00 us 15853
READDIRP
18.04 2726.17 us 7.00 us 1337047.00 us 53762
FINODELK
59.14 630.92 us 29.00 us 1358867.00 us 761500
LOOKUP
Duration: 2281 seconds
Data Read: 27416867 bytes
Data Written: 115562427 bytes
Interval 47 Stats:
Block Size: 4096b+ 8192b+
No. of Reads: 0 0
No. of Writes: 104 21
%-latency Avg-latency Min-Latency Max-Latency No. of calls
Fop
--------- ----------- ----------- ----------- ------------
----
0.00 0.00 us 0.00 us 0.00 us 7
RELEASE
0.00 0.00 us 0.00 us 0.00 us 21
RELEASEDIR
0.00 18.86 us 13.00 us 36.00 us 7
FLUSH
0.00 38.00 us 15.00 us 67.00 us 4
ENTRYLK
0.00 230.00 us 230.00 us 230.00 us 1
MKDIR
0.00 251.00 us 251.00 us 251.00 us 1
CREATE
0.01 116.50 us 33.00 us 455.00 us 6
OPEN
0.01 133.83 us 23.00 us 260.00 us 6
STAT
0.02 827.50 us 139.00 us 1516.00 us 2
STATFS
0.03 103.95 us 31.00 us 284.00 us 21
OPENDIR
0.07 339.07 us 66.00 us 907.00 us 14
READDIRP
0.08 89.11 us 20.00 us 750.00 us 64
FSTAT
0.23 123.34 us 48.00 us 901.00 us 125
WRITE
0.41 105.09 us 16.00 us 2021.00 us 263
FINODELK
0.86 234.20 us 73.00 us 8309.00 us 249
FXATTROP
98.27 794.98 us 32.00 us 372846.00 us 8420
LOOKUP
Duration: 11 seconds
Data Read: 0 bytes
Data Written: 993600 bytes
Brick: stg100mol2-int.coupahost.com:/mnt/gluster/export
-------------------------------------------------------
Cumulative Stats:
Block Size: 1b+ 2b+
4b+
No. of Reads: 0 0
0
No. of Writes: 98 8
69
Block Size: 8b+ 16b+
32b+
No. of Reads: 0 0
0
No. of Writes: 125 43
7
Block Size: 64b+ 128b+
256b+
No. of Reads: 0 3
13
No. of Writes: 154 620
262
Block Size: 512b+ 1024b+
2048b+
No. of Reads: 32 58
15
No. of Writes: 373 86
60
Block Size: 4096b+ 8192b+
16384b+
No. of Reads: 0 6
16
No. of Writes: 11957 2398
6
Block Size: 32768b+ 65536b+
131072b+
No. of Reads: 19 46
163
No. of Writes: 7 0
0
%-latency Avg-latency Min-Latency Max-Latency No. of calls
Fop
--------- ----------- ----------- ----------- ------------
----
0.00 0.00 us 0.00 us 0.00 us 712
FORGET
0.00 0.00 us 0.00 us 0.00 us 5789
RELEASE
0.00 0.00 us 0.00 us 0.00 us 5896
RELEASEDIR
0.00 131.00 us 131.00 us 131.00 us 1
RMDIR
0.00 87.00 us 61.00 us 113.00 us 2
GETXATTR
0.00 197.12 us 32.00 us 2304.00 us 41
FTRUNCATE
0.01 602.80 us 214.00 us 11089.00 us 49
MKDIR
0.01 105.21 us 38.00 us 4226.00 us 471
TRUNCATE
0.01 514.50 us 17.00 us 44276.00 us 98
LK
0.03 369.86 us 14.00 us 35614.00 us 322
STAT
0.07 618.82 us 38.00 us 230853.00 us 471
SETATTR
0.07 427.43 us 172.00 us 21070.00 us 709
CREATE
0.13 589.38 us 107.00 us 47276.00 us 942
XATTROP
0.15 3001.27 us 111.00 us 600028.00 us 221
STATFS
0.18 284.42 us 11.00 us 230739.00 us 2725
INODELK
0.24 2732.04 us 23.00 us 85370.00 us 385
READ
0.27 2572.42 us 75.00 us 256620.00 us 457
RENAME
0.33 239.45 us 24.00 us 625901.00 us 5951
OPEN
0.37 169.74 us 15.00 us 433133.00 us 9356
FSTAT
0.39 1164.77 us 14.00 us 468495.00 us 1449
READDIR
0.44 5045.44 us 121.00 us 89320.00 us 377
UNLINK
0.46 339.88 us 21.00 us 632652.00 us 5896
OPENDIR
0.55 145.86 us 25.00 us 123050.00 us 16273
WRITE
0.76 803.77 us 11.00 us 857743.00 us 4100
ENTRYLK
1.69 14534.79 us 1493.00 us 464961.00 us 505
FSYNC
4.71 2078.22 us 6.00 us 818633.00 us 9841
FLUSH
5.05 2310.54 us 56.00 us 615643.00 us 9497
READDIRP
5.95 791.32 us 63.00 us 608936.00 us 32628
FXATTROP
6.97 563.13 us 6.00 us 1103183.00 us 53723
FINODELK
71.18 405.92 us 8.00 us 1216554.00 us 761502
LOOKUP
Duration: 2250 seconds
Data Read: 27138474 bytes
Data Written: 115562427 bytes
Interval 47 Stats:
Block Size: 4096b+ 8192b+
No. of Reads: 0 0
No. of Writes: 104 21
%-latency Avg-latency Min-Latency Max-Latency No. of calls
Fop
--------- ----------- ----------- ----------- ------------
----
0.00 0.00 us 0.00 us 0.00 us 7
RELEASE
0.00 0.00 us 0.00 us 0.00 us 21
RELEASEDIR
0.00 26.00 us 26.00 us 26.00 us 1
STAT
0.00 195.00 us 195.00 us 195.00 us 1
CREATE
0.00 53.25 us 27.00 us 86.00 us 4
ENTRYLK
0.00 249.00 us 249.00 us 249.00 us 1
MKDIR
0.00 159.00 us 125.00 us 193.00 us 2
STATFS
0.01 52.00 us 18.00 us 143.00 us 7
FLUSH
0.01 65.67 us 33.00 us 136.00 us 6
OPEN
0.03 98.14 us 25.00 us 405.00 us 21
OPENDIR
0.04 50.35 us 18.00 us 202.00 us 57
FSTAT
0.17 381.32 us 77.00 us 926.00 us 28
READDIRP
0.26 134.29 us 50.00 us 1403.00 us 125
WRITE
0.93 240.55 us 71.00 us 10168.00 us 250
FXATTROP
0.98 240.87 us 15.00 us 34353.00 us 264
FINODELK
97.56 749.24 us 28.00 us 296964.00 us 8417
LOOKUP
Duration: 11 seconds
Data Read: 0 bytes
Data Written: 993600 bytes
--
Thank You,
Charles Cooke
Senior Cloud Software Engineer
Coupa Software | www.coupa.com
charles.cooke at coupa.com
Cell: 902.452.4858
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Charles Cooke
2013-Jun-06 12:23 UTC
[Gluster-users] GlusterFS (3.3.1) - performance issues - large number of LOOKUP calls & high CPU usage
On Mon, May 27, 2013 at 5:20 PM, Charles Cooke <charles at coupa.com> wrote:> Hi, > > We are currently attempting to use GlusterFS but are encountering > significant performance issues in our environment. The symptoms we are > seeing are that read/write performance degrades and the glusterfsd > eventually takes up to 100% of the CPU. > > We currently run in a simple 1x2 replicated configuration. The I/O > primarily consists of write operations, with a smaller amount of reads. > > What we see consistently on profiling is that the LOOKUP calls are > consistently taking the majority of the time. I am not sure what this > represents - but the ordinality seems to be out of whack - eg. when several > dozen read/write operations are taking place, there will be several > thousand LOOKUP calls. > > Following the discussion in the IRC Archives - there was some indication > that our symptoms (large number of LOOKUP calls) were the result of > self-heal checks and/or DHT misses as per: > http://irclog.perlgeek.de/gluster/2012-11-28 > --> JoeJulian Well, that's either self-heal checks and/or dht misses. > > So we've disabled the self-heal daemon and turned lookup-unhashed off. > But this hasn't had an impact on the performance either way. The volume > information is shown below along with volume profiling information. > > Volume Name: gluster > Type: Replicate > Volume ID: 08cb1e95-1f56-449c-b427-8f1921371d5a > Status: Started > Number of Bricks: 1 x 2 = 2 > Transport-type: tcp > Bricks: > Brick1: stg100mol1-int.coupahost.com:/mnt/gluster/export > Brick2: stg100mol2-int.coupahost.com:/mnt/gluster/export > Options Reconfigured: > performance.cache-size: 2000000000 > performance.cache-refresh-timeout: 0 > geo-replication.indexing: off > diagnostics.latency-measurement: on > diagnostics.count-fop-hits: on > cluster.self-heal-daemon: off > cluster.lookup-unhashed: off > > > Brick: stg100mol1-int.coupahost.com:/mnt/gluster/export > ------------------------------------------------------- > Cumulative Stats: > Block Size: 1b+ 2b+ > 4b+ > No. of Reads: 0 0 > 0 > No. of Writes: 98 8 > 69 > > Block Size: 8b+ 16b+ > 32b+ > No. of Reads: 0 0 > 0 > No. of Writes: 125 43 > 7 > > Block Size: 64b+ 128b+ > 256b+ > No. of Reads: 3 0 > 18 > No. of Writes: 154 620 > 262 > > Block Size: 512b+ 1024b+ > 2048b+ > No. of Reads: 27 68 > 14 > No. of Writes: 373 86 > 60 > > Block Size: 4096b+ 8192b+ > 16384b+ > No. of Reads: 0 6 > 14 > No. of Writes: 11957 2398 > 6 > > Block Size: 32768b+ 65536b+ > 131072b+ > No. of Reads: 17 65 > 149 > No. of Writes: 7 0 > 0 > > %-latency Avg-latency Min-Latency Max-Latency No. of calls > Fop > --------- ----------- ----------- ----------- ------------ > ---- > 0.00 0.00 us 0.00 us 0.00 us 712 > FORGET > 0.00 0.00 us 0.00 us 0.00 us 5789 > RELEASE > 0.00 0.00 us 0.00 us 0.00 us 5896 > RELEASEDIR > 0.00 86.33 us 52.00 us 137.00 us 3 > GETXATTR > 0.00 1045.00 us 1045.00 us 1045.00 us 1 > RMDIR > 0.00 156.98 us 32.00 us 1272.00 us 41 > FTRUNCATE > 0.00 572.24 us 212.00 us 3865.00 us 49 > MKDIR > 0.01 135.47 us 36.00 us 6126.00 us 471 > TRUNCATE > 0.01 160.58 us 14.00 us 5641.00 us 470 > STAT > 0.03 517.82 us 38.00 us 163774.00 us 471 > SETATTR > 0.07 1445.84 us 25.00 us 97172.00 us 396 > READ > 0.07 401.11 us 13.00 us 33647.00 us 1449 > READDIR > 0.10 3617.81 us 111.00 us 237368.00 us 221 > STATFS > 0.10 8252.17 us 14.00 us 406281.00 us 99 > LK > 0.10 1161.94 us 162.00 us 263151.00 us 709 > CREATE > 0.12 2204.37 us 79.00 us 175090.00 us 457 > RENAME > 0.13 1084.25 us 84.00 us 487294.00 us 942 > XATTROP > 0.24 336.51 us 23.00 us 753796.00 us 5896 > OPENDIR > 0.25 343.05 us 25.00 us 267306.00 us 5951 > OPEN > 0.26 763.13 us 12.00 us 498524.00 us 2729 > INODELK > 0.26 518.81 us 11.00 us 574717.00 us 4100 > ENTRYLK > 0.27 5757.93 us 65.00 us 266003.00 us 377 > UNLINK > 0.28 141.80 us 25.00 us 33487.00 us 16273 > WRITE > 0.38 303.52 us 12.00 us 905949.00 us 10244 > FSTAT > 0.88 14109.27 us 1733.00 us 574868.00 us 505 > FSYNC > 2.17 1793.98 us 7.00 us 1341172.00 us 9841 > FLUSH > 3.17 788.24 us 66.00 us 925523.00 us 32627 > FXATTROP > 13.92 7132.57 us 55.00 us 735763.00 us 15853 > READDIRP > 18.04 2726.17 us 7.00 us 1337047.00 us 53762 > FINODELK > 59.14 630.92 us 29.00 us 1358867.00 us 761500 > LOOKUP > > Duration: 2281 seconds > Data Read: 27416867 bytes > Data Written: 115562427 bytes > > Interval 47 Stats: > Block Size: 4096b+ 8192b+ > No. of Reads: 0 0 > No. of Writes: 104 21 > %-latency Avg-latency Min-Latency Max-Latency No. of calls > Fop > --------- ----------- ----------- ----------- ------------ > ---- > 0.00 0.00 us 0.00 us 0.00 us 7 > RELEASE > 0.00 0.00 us 0.00 us 0.00 us 21 > RELEASEDIR > 0.00 18.86 us 13.00 us 36.00 us 7 > FLUSH > 0.00 38.00 us 15.00 us 67.00 us 4 > ENTRYLK > 0.00 230.00 us 230.00 us 230.00 us 1 > MKDIR > 0.00 251.00 us 251.00 us 251.00 us 1 > CREATE > 0.01 116.50 us 33.00 us 455.00 us 6 > OPEN > 0.01 133.83 us 23.00 us 260.00 us 6 > STAT > 0.02 827.50 us 139.00 us 1516.00 us 2 > STATFS > 0.03 103.95 us 31.00 us 284.00 us 21 > OPENDIR > 0.07 339.07 us 66.00 us 907.00 us 14 > READDIRP > 0.08 89.11 us 20.00 us 750.00 us 64 > FSTAT > 0.23 123.34 us 48.00 us 901.00 us 125 > WRITE > 0.41 105.09 us 16.00 us 2021.00 us 263 > FINODELK > 0.86 234.20 us 73.00 us 8309.00 us 249 > FXATTROP > 98.27 794.98 us 32.00 us 372846.00 us 8420 > LOOKUP > > Duration: 11 seconds > Data Read: 0 bytes > Data Written: 993600 bytes > > Brick: stg100mol2-int.coupahost.com:/mnt/gluster/export > ------------------------------------------------------- > Cumulative Stats: > Block Size: 1b+ 2b+ > 4b+ > No. of Reads: 0 0 > 0 > No. of Writes: 98 8 > 69 > > Block Size: 8b+ 16b+ > 32b+ > No. of Reads: 0 0 > 0 > No. of Writes: 125 43 > 7 > > Block Size: 64b+ 128b+ > 256b+ > No. of Reads: 0 3 > 13 > No. of Writes: 154 620 > 262 > > Block Size: 512b+ 1024b+ > 2048b+ > No. of Reads: 32 58 > 15 > No. of Writes: 373 86 > 60 > > Block Size: 4096b+ 8192b+ > 16384b+ > No. of Reads: 0 6 > 16 > No. of Writes: 11957 2398 > 6 > > Block Size: 32768b+ 65536b+ > 131072b+ > No. of Reads: 19 46 > 163 > No. of Writes: 7 0 > 0 > > %-latency Avg-latency Min-Latency Max-Latency No. of calls > Fop > --------- ----------- ----------- ----------- ------------ > ---- > 0.00 0.00 us 0.00 us 0.00 us 712 > FORGET > 0.00 0.00 us 0.00 us 0.00 us 5789 > RELEASE > 0.00 0.00 us 0.00 us 0.00 us 5896 > RELEASEDIR > 0.00 131.00 us 131.00 us 131.00 us 1 > RMDIR > 0.00 87.00 us 61.00 us 113.00 us 2 > GETXATTR > 0.00 197.12 us 32.00 us 2304.00 us 41 > FTRUNCATE > 0.01 602.80 us 214.00 us 11089.00 us 49 > MKDIR > 0.01 105.21 us 38.00 us 4226.00 us 471 > TRUNCATE > 0.01 514.50 us 17.00 us 44276.00 us 98 > LK > 0.03 369.86 us 14.00 us 35614.00 us 322 > STAT > 0.07 618.82 us 38.00 us 230853.00 us 471 > SETATTR > 0.07 427.43 us 172.00 us 21070.00 us 709 > CREATE > 0.13 589.38 us 107.00 us 47276.00 us 942 > XATTROP > 0.15 3001.27 us 111.00 us 600028.00 us 221 > STATFS > 0.18 284.42 us 11.00 us 230739.00 us 2725 > INODELK > 0.24 2732.04 us 23.00 us 85370.00 us 385 > READ > 0.27 2572.42 us 75.00 us 256620.00 us 457 > RENAME > 0.33 239.45 us 24.00 us 625901.00 us 5951 > OPEN > 0.37 169.74 us 15.00 us 433133.00 us 9356 > FSTAT > 0.39 1164.77 us 14.00 us 468495.00 us 1449 > READDIR > 0.44 5045.44 us 121.00 us 89320.00 us 377 > UNLINK > 0.46 339.88 us 21.00 us 632652.00 us 5896 > OPENDIR > 0.55 145.86 us 25.00 us 123050.00 us 16273 > WRITE > 0.76 803.77 us 11.00 us 857743.00 us 4100 > ENTRYLK > 1.69 14534.79 us 1493.00 us 464961.00 us 505 > FSYNC > 4.71 2078.22 us 6.00 us 818633.00 us 9841 > FLUSH > 5.05 2310.54 us 56.00 us 615643.00 us 9497 > READDIRP > 5.95 791.32 us 63.00 us 608936.00 us 32628 > FXATTROP > 6.97 563.13 us 6.00 us 1103183.00 us 53723 > FINODELK > 71.18 405.92 us 8.00 us 1216554.00 us 761502 > LOOKUP > > Duration: 2250 seconds > Data Read: 27138474 bytes > Data Written: 115562427 bytes > > Interval 47 Stats: > Block Size: 4096b+ 8192b+ > No. of Reads: 0 0 > No. of Writes: 104 21 > %-latency Avg-latency Min-Latency Max-Latency No. of calls > Fop > --------- ----------- ----------- ----------- ------------ > ---- > 0.00 0.00 us 0.00 us 0.00 us 7 > RELEASE > 0.00 0.00 us 0.00 us 0.00 us 21 > RELEASEDIR > 0.00 26.00 us 26.00 us 26.00 us 1 > STAT > 0.00 195.00 us 195.00 us 195.00 us 1 > CREATE > 0.00 53.25 us 27.00 us 86.00 us 4 > ENTRYLK > 0.00 249.00 us 249.00 us 249.00 us 1 > MKDIR > 0.00 159.00 us 125.00 us 193.00 us 2 > STATFS > 0.01 52.00 us 18.00 us 143.00 us 7 > FLUSH > 0.01 65.67 us 33.00 us 136.00 us 6 > OPEN > 0.03 98.14 us 25.00 us 405.00 us 21 > OPENDIR > 0.04 50.35 us 18.00 us 202.00 us 57 > FSTAT > 0.17 381.32 us 77.00 us 926.00 us 28 > READDIRP > 0.26 134.29 us 50.00 us 1403.00 us 125 > WRITE > 0.93 240.55 us 71.00 us 10168.00 us 250 > FXATTROP > 0.98 240.87 us 15.00 us 34353.00 us 264 > FINODELK > 97.56 749.24 us 28.00 us 296964.00 us 8417 > LOOKUP > > Duration: 11 seconds > Data Read: 0 bytes > Data Written: 993600 bytes > > > > >Hello, As a followup for anyone experiencing similar issues - switching to an NFS mount from a Gluster Native resolved the issue. The giveaway was the large number of context switches happening in the kernel during some heavy operations (vmstat or dstat) - neither the I/O, network interface, or CPU was the bottleneck - but the context switching was causing significant impact on the performance of our Java application. The application has a large volume of writes on many small files, which is not ideal for the FUSE client. Switching to NFS brought the times down an order of magnitude. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20130606/ba5be1d9/attachment.html>