Hi Krutika,
Attached the profile stats. I enabled profiling then ran some dd tests. Also 3 Windows VMs are running on top this volume but did not do any stress testing on the VMs. I have left the profiling enabled in case more time is needed for useful stats. On Tue, Sep 5, 2017 at 12:48 PM, Krutika Dhananjay <kdhananj@xxxxxxxxxx> wrote:
-KrutikaOK my understanding is that with preallocated disks the performance with and without shard will be the same.In any case, please attach the volume profile[1], so we can see what else is slowing things down.
[1] - https://gluster.readthedocs.io/en/latest/Administrator% 20Guide/Monitoring%20Workload/ #running-glusterfs-volume- profile-command On Tue, Sep 5, 2017 at 2:32 PM, Abi Askushi <rightkicktech@xxxxxxxxx> wrote:The setup is a set of 3 Centos 7.3 servers and ovirt 4.1, using gluster as storage.The version of gluster I am using is glusterfs 3.8.12 built on May 11 2017 18:46:20.Enabling client-io-threads also did not have any affect.I tried also several values of shard-block-size and I keep getting the same low values on write performance.Now I am checking performance with dd on the hypervisors which have the gluster volume configured.Hi Krutika,I already have a preallocated disk on VM.Below are the current settings:
Volume Name: vms
Type: Replicate
Volume ID: 4513340d-7919-498b-bfe0-d836b5cea40b server.event-threads: 4
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: gluster0:/gluster/vms/brick
Brick2: gluster1:/gluster/vms/brick
Brick3: gluster2:/gluster/vms/brick (arbiter)
Options Reconfigured:
client.event-threads: 4
performance.client-io-threads: on
features.shard-block-size: 512MB
cluster.granular-entry-heal: enable
performance.strict-o-direct: on
network.ping-timeout: 30
storage.owner-gid: 36
storage.owner-uid: 36
user.cifs: off
features.shard: on
cluster.shd-wait-qlength: 10000
cluster.shd-max-threads: 8
cluster.locking-scheme: granular
cluster.data-self-heal-algorithm: full performance.stat-prefetch: on
cluster.server-quorum-type: server
cluster.quorum-type: auto
cluster.eager-lock: enable
network.remote-dio: off
performance.low-prio-threads: 32
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
transport.address-family: inet
performance.readdir-ahead: on
nfs.disable: on
nfs.export-volumes: onI observed that when testing with dd if=/dev/zero of=testfile bs=1G count=1 I get 65MB/s on the vms gluster volume (and the network traffic between the servers reaches ~ 500Mbps), while when testing with dd if=/dev/zero of=testfile bs=1G count=1 oflag=direct I get a consistent 10MB/s and the network traffic hardly reaching 100Mbps.
Any other things one can do?On Tue, Sep 5, 2017 at 5:57 AM, Krutika Dhananjay <kdhananj@xxxxxxxxxx> wrote:-KrutikaSecond, I'm assuming you're using the default shard block size of 4MB (you can confirm this using `gluster volume get <VOL> shard-block-size`). In our tests, we've found that larger shard sizes perform better. So maybe change the shard-block-size to 64MB (`gluster volume set <VOL> shard-block-size 64MB`).This will at least eliminate the need for shard to perform multiple steps as part of the writes - such as creating the shard and then writing to it and then updating the aggregated file size - all of which require one network call each, which further get blown up once they reach AFR (replicate) into many more network calls.I'm assuming you are using this volume to store vm images, because I see shard in the options list.Speaking from shard translator's POV, one thing you can do to improve performance is to use preallocated images.Third, keep stat-prefetch enabled. We've found that qemu sends quite a lot of [f]stats which can be served from the (md)cache to improve performance. So enable that.Also, could you also enable client-io-threads and see if that improves performance?Which version of gluster are you using BTW?On Tue, Sep 5, 2017 at 4:32 AM, Abi Askushi <rightkicktech@xxxxxxxxx> wrote:______________________________Hi all,I have a gluster volume used to host several VMs (managed through oVirt).The volume is a replica 3 with arbiter and the 3 servers use 1 Gbit network for the storage.When testing with dd (dd if=/dev/zero of=testfile bs=1G count=1 oflag=direct) out of the volume (e.g. writing at /root/) the performance of the dd is reported to be ~ 700MB/s, which is quite decent. When testing the dd on the gluster volume I get ~ 43 MB/s which way lower from the previous. When testing with dd the gluster volume, the network traffic was not exceeding 450 Mbps on the network interface. I would expect to reach near 900 Mbps considering that there is 1 Gbit of bandwidth available. This results having VMs with very slow performance (especially on their write operations).The full details of the volume are below. Any advise on what can be tweaked will be highly appreciated.Volume Name: vms
Type: Replicate
Volume ID: 4513340d-7919-498b-bfe0-d836b5cea40b
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: gluster0:/gluster/vms/brick
Brick2: gluster1:/gluster/vms/brick
Brick3: gluster2:/gluster/vms/brick (arbiter)
Options Reconfigured:
cluster.granular-entry-heal: enable
performance.strict-o-direct: on
network.ping-timeout: 30
storage.owner-gid: 36
storage.owner-uid: 36
user.cifs: off
features.shard: on
cluster.shd-wait-qlength: 10000
cluster.shd-max-threads: 8
cluster.locking-scheme: granular
cluster.data-self-heal-algorithm: full
cluster.server-quorum-type: server
cluster.quorum-type: auto
cluster.eager-lock: enable
network.remote-dio: off
performance.low-prio-threads: 32
performance.stat-prefetch: off
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
transport.address-family: inet
performance.readdir-ahead: on
nfs.disable: on
nfs.export-volumes: onThanx,Alex_________________
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Brick: gluster0:/gluster/vms/brick
----------------------------------
Cumulative Stats:
Block Size: 32b+ 256b+ 512b+
No. of Reads: 0 7093 79384
No. of Writes: 12 134 16639
Block Size: 1024b+ 2048b+ 4096b+
No. of Reads: 76171 88973 408733
No. of Writes: 128548 129482 622604
Block Size: 8192b+ 16384b+ 32768b+
No. of Reads: 562933 175791 164097
No. of Writes: 379782 132651 93864
Block Size: 65536b+ 131072b+
No. of Reads: 151097 551006
No. of Writes: 121271 670952
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 411 FORGET
0.00 0.00 us 0.00 us 0.00 us 188771 RELEASE
0.00 0.00 us 0.00 us 0.00 us 37310 RELEASEDIR
0.00 56.58 us 44.00 us 88.00 us 12 SETXATTR
0.00 89.00 us 64.00 us 160.00 us 12 RMDIR
0.00 278.80 us 135.00 us 520.00 us 5 TRUNCATE
0.00 110.71 us 34.00 us 164.00 us 14 XATTROP
0.00 113.64 us 9.00 us 383.00 us 14 READDIR
0.00 127.00 us 96.00 us 163.00 us 24 RENAME
0.00 265.09 us 80.00 us 1892.00 us 22 UNLINK
0.00 359.81 us 8.00 us 6695.00 us 43 GETXATTR
0.00 9722.50 us 7233.00 us 14112.00 us 4 MKNOD
0.00 8439.92 us 128.00 us 17393.00 us 12 MKDIR
0.00 1566.25 us 44.00 us 21348.00 us 104 REMOVEXATTR
0.00 1802.21 us 43.00 us 47897.00 us 111 SETATTR
0.00 10117.71 us 110.00 us 62262.00 us 24 CREATE
0.00 3599.83 us 10.00 us 15143.00 us 70 FLUSH
0.00 2881.88 us 31.00 us 100555.00 us 194 OPEN
0.00 1528.12 us 20.00 us 37185.00 us 472 READDIRP
0.00 2272.81 us 25.00 us 94470.00 us 328 FSTAT
0.00 1658.86 us 1.00 us 27155.00 us 567 OPENDIR
0.00 542.75 us 15.00 us 91928.00 us 1740 STAT
0.01 1699.46 us 11.00 us 45324.00 us 780 STATFS
0.05 28118.57 us 10.00 us 587648.00 us 399 ENTRYLK
0.13 25935.31 us 10.00 us 1693505.00 us 986 INODELK
0.47 9175.02 us 11.00 us 642079.00 us 10369 FSYNC
0.65 8647.81 us 10.00 us 64883650.00 us 15345 LOOKUP
1.23 9379.15 us 16.00 us 7110244.00 us 26708 FXATTROP
3.01 7832.97 us 17.00 us 799409.00 us 78472 READ
44.22 261211.86 us 51.00 us 1015501.00 us 34569 WRITE
50.22 182315.78 us 8.00 us 1584450.00 us 56251 FINODELK
Duration: 67635 seconds
Data Read: 100176806862 bytes
Data Written: 112553284400 bytes
Interval 9 Stats:
Block Size: 256b+ 512b+ 1024b+
No. of Reads: 2 2 1
No. of Writes: 0 1 0
Block Size: 2048b+ 4096b+ 8192b+
No. of Reads: 2 104 20
No. of Writes: 0 161 77
Block Size: 16384b+ 32768b+ 65536b+
No. of Reads: 342 353 165
No. of Writes: 46 14 11
Block Size: 131072b+
No. of Reads: 16
No. of Writes: 930
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 23 FORGET
0.00 0.00 us 0.00 us 0.00 us 4 RELEASE
0.00 0.00 us 0.00 us 0.00 us 3 RELEASEDIR
0.00 76.00 us 76.00 us 76.00 us 1 FSTAT
0.00 43.00 us 17.00 us 69.00 us 2 FLUSH
0.00 36.50 us 28.00 us 41.00 us 4 OPENDIR
0.00 81.50 us 50.00 us 120.00 us 4 OPEN
0.00 46.60 us 23.00 us 93.00 us 10 STATFS
0.00 156.50 us 23.00 us 336.00 us 6 READDIRP
0.00 499.03 us 42.00 us 6709.00 us 33 STAT
0.03 1201.35 us 49.00 us 47975.00 us 214 LOOKUP
0.19 1265.42 us 20.00 us 163429.00 us 1276 FXATTROP
0.35 8882.97 us 14.00 us 418304.00 us 344 FSYNC
0.59 4796.28 us 22.00 us 188365.00 us 1063 READ
10.98 76545.35 us 3614.00 us 430475.00 us 1246 WRITE
87.86 244152.22 us 11.00 us 1306226.00 us 3126 FINODELK
Duration: 16 seconds
Data Read: 31334024 bytes
Data Written: 125681664 bytes
Brick: gluster2:/gluster/vms/brick
----------------------------------
Cumulative Stats:
Block Size: 1b+
No. of Reads: 0
No. of Writes: 2481551
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 577 FORGET
0.00 0.00 us 0.00 us 0.00 us 266910 RELEASE
0.00 0.00 us 0.00 us 0.00 us 38816 RELEASEDIR
0.00 77.60 us 49.00 us 95.00 us 5 TRUNCATE
0.00 80.67 us 44.00 us 126.00 us 12 SETXATTR
0.00 106.83 us 66.00 us 153.00 us 12 RMDIR
0.00 129.50 us 42.00 us 257.00 us 14 XATTROP
0.00 134.93 us 11.00 us 508.00 us 14 READDIR
0.00 110.82 us 65.00 us 241.00 us 22 UNLINK
0.00 58.95 us 9.00 us 160.00 us 42 GETXATTR
0.00 87.30 us 45.00 us 176.00 us 33 FSTAT
0.00 42.63 us 11.00 us 94.00 us 70 FLUSH
0.01 81.05 us 38.00 us 208.00 us 104 REMOVEXATTR
0.01 89.28 us 37.00 us 172.00 us 111 SETATTR
0.02 71.49 us 31.00 us 160.00 us 194 OPEN
0.02 42.48 us 9.00 us 1465.00 us 400 ENTRYLK
0.05 56.30 us 1.00 us 183.00 us 567 OPENDIR
0.05 8110.50 us 2480.00 us 11210.00 us 4 MKNOD
0.06 42.69 us 9.00 us 214.00 us 986 INODELK
0.14 4015.42 us 102.00 us 16841.00 us 24 RENAME
0.31 9026.62 us 95.00 us 102332.00 us 24 CREATE
0.37 21182.58 us 164.00 us 103452.00 us 12 MKDIR
2.71 54.37 us 11.00 us 1930.00 us 34568 WRITE
9.09 236.01 us 16.00 us 193113.00 us 26709 FXATTROP
10.01 452.32 us 9.00 us 127407.00 us 15347 LOOKUP
17.85 209.26 us 8.00 us 119349.00 us 59169 FINODELK
59.28 3964.37 us 12.00 us 231606.00 us 10372 FSYNC
Duration: 71894 seconds
Data Read: 0 bytes
Data Written: 2481551 bytes
Interval 9 Stats:
Block Size: 1b+
No. of Reads: 0
No. of Writes: 1239
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 34 FORGET
0.00 0.00 us 0.00 us 0.00 us 4 RELEASE
0.00 0.00 us 0.00 us 0.00 us 3 RELEASEDIR
0.00 37.50 us 30.00 us 45.00 us 2 FLUSH
0.01 75.75 us 58.00 us 113.00 us 4 OPEN
0.01 82.50 us 55.00 us 141.00 us 4 OPENDIR
2.02 52.36 us 13.00 us 143.00 us 1239 WRITE
2.45 371.39 us 46.00 us 8633.00 us 212 LOOKUP
7.23 182.03 us 19.00 us 122613.00 us 1275 FXATTROP
43.53 4071.27 us 14.00 us 116265.00 us 343 FSYNC
44.74 423.54 us 9.00 us 92407.00 us 3389 FINODELK
Duration: 16 seconds
Data Read: 0 bytes
Data Written: 1239 bytes
Brick: gluster1:/gluster/vms/brick
----------------------------------
Cumulative Stats:
Block Size: 32b+ 256b+ 512b+
No. of Reads: 0 11694 2839
No. of Writes: 8 90 13871
Block Size: 1024b+ 2048b+ 4096b+
No. of Reads: 5962 4739 46620
No. of Writes: 97317 94324 478065
Block Size: 8192b+ 16384b+ 32768b+
No. of Reads: 18976 20815 26327
No. of Writes: 261476 108447 73657
Block Size: 65536b+ 131072b+
No. of Reads: 23025 37767
No. of Writes: 91901 666916
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 175 FORGET
0.00 0.00 us 0.00 us 0.00 us 25105 RELEASE
0.00 0.00 us 0.00 us 0.00 us 32798 RELEASEDIR
0.00 76.75 us 53.00 us 110.00 us 12 SETXATTR
0.00 95.83 us 58.00 us 141.00 us 12 RMDIR
0.00 291.40 us 226.00 us 446.00 us 5 TRUNCATE
0.00 134.50 us 61.00 us 278.00 us 14 XATTROP
0.00 128.46 us 82.00 us 209.00 us 24 RENAME
0.00 173.65 us 10.00 us 451.00 us 20 READDIR
0.00 161.91 us 82.00 us 662.00 us 22 UNLINK
0.00 8810.25 us 5320.00 us 11953.00 us 4 MKNOD
0.00 6320.17 us 183.00 us 13998.00 us 12 MKDIR
0.00 838.83 us 39.00 us 12448.00 us 104 REMOVEXATTR
0.00 934.96 us 39.00 us 29283.00 us 111 SETATTR
0.00 2144.17 us 11.00 us 41256.00 us 70 FLUSH
0.00 6324.54 us 112.00 us 19306.00 us 24 CREATE
0.00 936.09 us 22.00 us 23659.00 us 187 FSTAT
0.01 1918.45 us 27.00 us 104525.00 us 194 OPEN
0.01 835.49 us 1.00 us 66949.00 us 570 OPENDIR
0.01 906.71 us 17.00 us 24395.00 us 635 READDIRP
0.01 814.12 us 11.00 us 22800.00 us 782 STATFS
0.01 1638.38 us 7.00 us 27751.00 us 399 ENTRYLK
0.02 676.51 us 23.00 us 60154.00 us 1341 STAT
0.02 12337.72 us 9.00 us 1093769.00 us 90 GETXATTR
0.06 3416.72 us 10.00 us 2658066.00 us 986 INODELK
0.57 1937.28 us 12.00 us 264094.00 us 15322 LOOKUP
1.42 1290.09 us 7.00 us 357697.00 us 57354 FINODELK
1.87 9391.45 us 12.00 us 808993.00 us 10372 FSYNC
1.88 3670.51 us 15.00 us 1453184.00 us 26708 FXATTROP
7.69 6216.58 us 27.00 us 571432.00 us 64311 READ
86.39 130052.64 us 47.00 us 849076.00 us 34555 WRITE
Duration: 58560 seconds
Data Read: 8469686670 bytes
Data Written: 106142019052 bytes
Interval 9 Stats:
Block Size: 256b+ 512b+ 1024b+
No. of Reads: 4 6 8
No. of Writes: 0 1 0
Block Size: 2048b+ 4096b+ 8192b+
No. of Reads: 9 308 128
No. of Writes: 0 161 77
Block Size: 16384b+ 32768b+ 65536b+
No. of Reads: 334 391 89
No. of Writes: 46 14 11
Block Size: 131072b+
No. of Reads: 12
No. of Writes: 929
%-latency Avg-latency Min-Latency Max-Latency No. of calls Fop
--------- ----------- ----------- ----------- ------------ ----
0.00 0.00 us 0.00 us 0.00 us 4 RELEASE
0.00 0.00 us 0.00 us 0.00 us 3 RELEASEDIR
0.00 200.00 us 200.00 us 200.00 us 1 READDIRP
0.00 1328.50 us 31.00 us 2626.00 us 2 FSTAT
0.00 1357.75 us 189.00 us 2867.00 us 4 OPENDIR
0.00 2471.75 us 42.00 us 8373.00 us 4 OPEN
0.01 12659.00 us 9422.00 us 15896.00 us 2 FLUSH
0.01 3924.20 us 19.00 us 10299.00 us 10 STATFS
0.06 3631.49 us 38.00 us 22434.00 us 47 STAT
0.50 6662.97 us 58.00 us 48168.00 us 213 LOOKUP
1.37 11380.10 us 13.00 us 143645.00 us 343 FSYNC
4.33 3938.49 us 7.00 us 237791.00 us 3142 FINODELK
4.49 10040.88 us 18.00 us 193886.00 us 1276 FXATTROP
6.13 13579.99 us 89.00 us 251439.00 us 1289 READ
83.10 191342.48 us 6995.00 us 736901.00 us 1240 WRITE
Duration: 16 seconds
Data Read: 29314832 bytes
Data Written: 125550592 bytes
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