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https://issues.apache.org/jira/browse/TS-724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022597#comment-13022597
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John Plevyak commented on TS-724:
---------------------------------
FYI a single document ends up on a single disk. If we could get the
per-"partition" cache stats we could see what ATS thought was going on.
> disk IO balance in v2.1.7
> -------------------------
>
> Key: TS-724
> URL: https://issues.apache.org/jira/browse/TS-724
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.1.7
> Environment: reporting from users, and confirm within my testing evn.
> v2.1.7 only
> Reporter: Zhao Yongming
> Priority: Critical
> Fix For: 2.1.9
>
>
> when multiple disk enabled, the disk IO will show much diff in v2.1.7, here
> is my result on a 7 disk system result:
> {code:none}
> [root@cache189 ~]# iostat -x 5
> Linux 2.6.18-164.11.1.el5 (cache189.cn8) 03/29/2011
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.51 0.00 0.54 1.77 0.00 97.18
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
> avgqu-sz await svctm %util
> sdb 0.00 0.00 11.80 0.00 360.80 0.00 30.58
> 0.07 5.73 5.56 6.56
> sdc 0.00 0.00 12.00 0.00 413.80 0.00 34.48
> 0.07 5.42 5.30 6.36
> sdd 0.00 0.00 11.60 1.40 375.80 820.80 92.05
> 0.07 5.06 4.66 6.06
> sde 0.00 0.00 13.00 14.00 722.60 8192.00 330.17
> 0.12 4.50 2.99 8.06
> sdf 0.00 0.00 14.60 0.00 579.40 0.00 39.68
> 0.11 7.48 7.04 10.28
> sdg 0.00 0.00 49.20 0.00 18268.60 0.00 371.31
> 0.08 1.66 0.54 2.66
> sdb 0.00 0.00 11.60 0.00 253.60 0.00 21.86
> 0.06 5.45 5.12 5.94
> sdc 0.00 0.00 15.80 0.00 738.20 0.00 46.72
> 0.08 5.22 4.76 7.52
> sdd 0.00 0.00 10.80 0.00 728.40 0.00 67.44
> 0.06 5.81 5.48 5.92
> sde 0.00 0.00 11.60 2.00 377.60 1027.20 103.29
> 0.07 5.18 4.75 6.46
> sdf 0.00 0.00 14.60 0.00 473.60 0.00 32.44
> 0.09 5.90 5.78 8.44
> sdg 0.00 0.00 87.00 0.00 37454.80 0.00 430.51
> 0.37 4.26 0.82 7.12
> sdb 0.00 0.00 15.80 0.00 786.40 0.00 49.77
> 0.10 6.56 5.76 9.10
> sdc 0.00 0.00 10.20 1.60 217.60 911.20 95.66
> 0.06 4.93 4.51 5.32
> sdd 0.00 0.00 13.00 0.00 665.00 0.00 51.15
> 0.08 6.12 5.80 7.54
> sde 0.00 0.00 11.60 0.00 419.40 0.00 36.16
> 0.06 5.43 5.17 6.00
> sdf 0.00 0.00 11.00 1.40 315.00 826.80 92.08
> 0.07 5.27 4.89 6.06
> sdg 0.00 0.00 27.00 0.00 8629.60 0.00 319.61
> 0.02 0.87 0.37 1.00
> sdb 0.00 0.00 12.80 0.00 380.00 0.00 29.69
> 0.07 5.22 4.98 6.38
> sdc 0.00 0.00 14.80 0.00 495.80 0.00 33.50
> 0.08 5.39 5.19 7.68
> sdd 0.00 0.00 10.40 0.00 267.40 0.00 25.71
> 0.06 5.87 5.46 5.68
> sde 0.00 0.00 12.20 0.00 691.20 0.00 56.66
> 0.07 5.93 5.48 6.68
> sdf 0.00 0.00 11.80 0.00 544.40 0.00 46.14
> 0.07 5.83 5.63 6.64
> sdg 0.00 0.00 57.00 0.00 22033.00 0.00 386.54
> 0.06 1.07 0.38 2.16
> sdb 0.00 0.00 13.20 0.00 546.40 0.00 41.39
> 0.08 5.73 5.73 7.56
> sdc 0.00 0.00 14.00 0.00 583.60 0.00 41.69
> 0.08 5.57 5.34 7.48
> sdd 0.00 0.00 12.80 0.00 639.20 0.00 49.94
> 0.07 5.61 5.14 6.58
> sde 0.00 0.00 12.40 0.00 403.20 0.00 32.52
> 0.26 20.98 11.03 13.68
> sdf 0.00 0.00 15.00 0.00 475.80 0.00 31.72
> 0.09 5.71 5.37 8.06
> sdg 0.00 0.00 91.80 0.00 39239.00 0.00 427.44
> 0.57 6.24 0.76 6.94
> sdb 0.00 0.00 10.60 0.00 326.60 0.00 30.81
> 0.06 5.60 5.04 5.34
> sdc 0.00 0.00 12.80 0.00 644.40 0.00 50.34
> 0.07 5.72 5.27 6.74
> sdd 0.00 0.00 14.80 0.00 624.00 0.00 42.16
> 0.08 5.61 5.50 8.14
> sde 0.00 0.00 9.20 0.00 283.00 0.00 30.76
> 0.05 5.83 5.67 5.22
> sdf 0.00 0.00 13.40 0.00 578.00 0.00 43.13
> 0.07 5.39 5.15 6.90
> sdg 0.00 0.00 12.80 0.00 680.80 0.00 53.19
> 0.01 0.41 0.33 0.42
> sdb 0.00 0.00 11.38 0.00 431.94 0.00 37.96
> 0.07 5.79 5.37 6.11
> sdc 0.00 0.00 12.18 0.00 323.55 0.00 26.57
> 0.07 5.82 5.66 6.89
> sdd 0.00 0.00 13.97 1.40 630.14 817.96 94.22
> 0.09 5.66 5.25 8.06
> sde 0.00 0.00 10.18 0.00 410.78 0.00 40.35
> 0.06 5.65 5.27 5.37
> sdf 0.00 0.00 12.77 0.00 634.93 0.00 49.70
> 0.07 5.55 5.50 7.03
> sdg 0.00 0.00 61.68 1.40 23901.80 818.36 391.92
> 0.15 2.36 0.73 4.61
> sdb 0.00 0.00 11.00 1.40 396.60 819.20 98.05
> 0.08 6.42 5.74 7.12
> sdc 0.00 0.00 10.80 0.00 394.20 0.00 36.50
> 0.06 5.37 5.26 5.68
> sdd 0.00 0.00 11.60 0.00 460.40 0.00 39.69
> 0.06 5.22 4.95 5.74
> sde 0.00 0.00 12.00 0.00 237.80 0.00 19.82
> 0.06 5.00 4.92 5.90
> sdf 0.00 0.00 11.20 0.00 496.00 0.00 44.29
> 0.06 5.52 5.32 5.96
> sdg 0.00 0.00 90.00 0.00 39829.60 0.00 442.55
> 0.22 2.41 0.76 6.82
> sdb 0.00 0.00 10.00 0.00 319.80 0.00 31.98
> 0.15 15.02 12.02 12.02
> sdc 0.00 0.00 13.40 0.00 326.40 0.00 24.36
> 0.09 6.81 6.22 8.34
> sdd 0.00 0.00 14.20 0.00 449.20 0.00 31.63
> 0.08 5.69 5.30 7.52
> sde 0.00 0.00 14.40 1.40 437.80 828.80 80.16
> 0.92 58.00 13.09 20.68
> sdf 0.00 0.00 9.60 0.00 339.80 0.00 35.40
> 0.06 5.81 5.69 5.46
> sdg 0.00 0.00 86.00 0.00 36594.20 0.00 425.51
> 0.10 1.15 0.36 3.12
> sdb 0.00 0.00 10.80 0.00 347.20 0.00 32.15
> 0.06 5.43 5.19 5.60
> sdc 0.00 0.00 15.00 0.00 484.20 0.00 32.28
> 0.08 5.60 5.43 8.14
> sdd 0.00 0.00 13.80 0.00 336.20 0.00 24.36
> 0.07 5.28 5.12 7.06
> sde 0.00 0.00 12.20 0.00 814.00 0.00 66.72
> 0.07 5.43 5.34 6.52
> sdf 0.00 0.00 12.60 0.00 461.20 0.00 36.60
> 0.07 5.92 5.52 6.96
> sdg 0.00 0.00 204.00 0.00 96744.40 0.00 474.24
> 1.32 6.47 0.62 12.62
> sdb 0.00 0.00 14.00 0.00 732.00 0.00 52.29
> 0.09 6.07 5.30 7.42
> sdc 0.00 0.00 15.60 0.00 705.40 0.00 45.22
> 0.09 5.91 5.62 8.76
> sdd 0.00 0.00 10.60 0.00 577.80 0.00 54.51
> 0.06 5.89 5.70 6.04
> sde 0.00 0.00 10.20 0.00 314.40 0.00 30.82
> 0.05 5.31 4.98 5.08
> sdf 0.00 0.00 13.60 0.00 581.40 0.00 42.75
> 0.07 5.46 5.37 7.30
> sdg 0.00 0.00 130.40 0.00 60000.00 0.00 460.12
> 0.39 3.01 0.52 6.84
> sdb 0.00 0.00 11.60 0.00 427.60 0.00 36.86
> 0.06 5.50 5.34 6.20
> sdc 0.00 0.00 13.20 1.40 474.60 889.60 93.44
> 0.08 5.44 5.00 7.30
> sdd 0.00 0.00 12.60 0.00 505.60 0.00 40.13
> 0.07 5.51 5.21 6.56
> sde 0.00 0.00 12.20 0.00 884.00 0.00 72.46
> 0.07 5.89 5.15 6.28
> sdf 0.00 0.00 11.80 0.00 558.20 0.00 47.31
> 0.07 5.88 5.56 6.56
> sdg 0.00 0.00 104.60 0.00 47564.80 0.00 454.73
> 0.12 1.12 0.40 4.18
> {code}
> here is my system status:
> {code:none}
> Bytes Used --- 201 GB
> Cache Size --- 976 GB
> HTTP Transaction Frequency and Speeds
> Transaction Type Frequency Speed(ms)
> --Hits--
> Fresh ----------------------- 80.893448 % 14
> Stale Revalidated ----------- 0.135829 % 0
> --Misses--
> Now Cached ------------------ 7.123453 % 3
> Server No Cache ------------- 11.500151 % 0
> Stale Reloaded -------------- 0.196197 % 0
> Client No Cache ------------- 0.000000 % 0
> {code}
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