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From "Schmerge, John (Contractor)" <John_Schme...@cable.comcast.com>
Subject Re: ATS Disk load distribution
Date Sun, 27 Mar 2016 18:01:37 GMT
Hi Steve,


Try adding a "volume=X"  to each line of your storage.config. There's an old issue with ATS
when you have a single volume and replace a drive, in which it (silently) does not use it
because because it cannot figure out which volume the drive belongs to. Explicitly assigning
the volume in storage.config sidesteps this condition.


-John


________________________________
From: Steve Malenfant <smalenfant@gmail.com>
Sent: Saturday, March 26, 2016 10:29 PM
To: users@trafficserver.apache.org
Subject: ATS Disk load distribution

Hi,

Our servers have 24 cache disks. On each of them, I'm seing an unusual pattern where the 14th
cache disk (/dev/sdn here) has half the tps and Blk_read of the others while running a simple
iostat.

The OS drive is /dev/sdy.

Is there something obvious that could explain this? Anybody else seeing similar behaviors?

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sdy               8.50         0.59       412.30    1182292  826749224
sdb              17.96      5574.30       763.26 11177773390 1530520872
sda              17.27      5427.78       753.80 10883976079 1511537961
sdc              16.76      5426.23       752.01 10880866108 1507966007
sdf              17.40      5415.19       754.99 10858730317 1513930486
sdd              17.42      5415.10       750.04 10858548347 1504011560
sdg              17.43      5482.40       757.33 10993500408 1518615277
sde              16.49      5265.87       740.41 10559295722 1484695034
sdh              17.38      5492.09       758.66 11012923059 1521284992
sdj              18.73      5849.73       787.82 11730078650 1579772953
sdk              16.85      5319.37       742.29 10666574619 1488471133
sdl              17.53      5608.22       766.14 11245803256 1536281866
sdn               8.58      2555.06       517.71 5123501157 1038125596
sdm              17.69      5525.47       757.92 11079862986 1519798735
sdo              15.75      5039.02       726.77 10104411633 1457343705
sdi              18.33      5684.66       782.37 11399081848 1568839983
sdq              17.49      5596.34       760.76 11221981240 1525498204
sdp              16.31      5143.23       734.07 10313388901 1471978836
sdr              16.96      5393.52       755.80 10815269418 1515562524
sdt              16.47      5293.78       740.87 10615265266 1485622464
sds              15.99      5201.40       732.21 10430031258 1468246477
sdv              17.92      5684.24       779.27 11398240262 1562614587
sdu              17.26      5504.14       760.25 11037086102 1524475490
sdx              17.74      5580.22       762.95 11189655745 1529890237
sdw              17.17      5308.27       744.56 10644334189 1493013627

Steve

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