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From Steve Malenfant <smalenf...@gmail.com>
Subject Re: ATS Disk load distribution
Date Mon, 28 Mar 2016 14:14:58 GMT
We already have this specified. This specific /dev/sdn device is just
receiving half the load compared to others across all our caches.

On Sun, Mar 27, 2016 at 2:01 PM, Schmerge, John (Contractor) <
John_Schmerge@cable.comcast.com> wrote:

> 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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