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List:       net-snmp-bugs
Subject:    [ net-snmp-Bugs-2344435 ] ucd/net diskio giving out bad values
From:       "SourceForge.net" <noreply () sourceforge ! net>
Date:       2008-12-01 16:09:02
Message-ID: E1L7BKY-000844-2V () d45xhf1 ! ch3 ! sourceforge ! com
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Bugs item #2344435, was opened at 2008-11-25 16:55
Message generated for change (Comment added) made by nobody
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112694&aid=2344435&group_id=12694

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: agent
Group: linux
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: ucd/net diskio giving out bad values

Initial Comment:
SNMP ucd-diskio (5.1.2 on RHEL 4) seems to be getting the wrong values for only some \
devices.  emcpowera through f are a lvm stripe and should have much closer numbers \
than snmp reports, compare to the numbers for iostat.  There are a total of 123 rows \
in the diskio table.

 diskIOIndex diskIODevice diskIONRead diskIONWritten diskIOReads diskIOWrites
          96    emcpowerf   142532608     2669520384     2108720     76301616
          97   emcpowerf1   411668480     1598185472     2387098       389327
          98    emcpowere   133198336     2704796160     2130011     76312896
          99   emcpowere1   417468416     1820561408     2390159       443533
         100    emcpowerd   142148608     2726492672     2109235     76296448
         101   emcpowerd1   408961024     1834766336     2386864       447083
         102    emcpowerc   133144064     2739240960     2131435     76304240
         103   emcpowerc1   412975104     1697140736     2391474       413485
         104    emcpowerb   142225920     2656632320     2108136     76294104
         105   emcpowerb1   407810048     1562439680     2385915       380607
         106    emcpowera   415690752     1663365120     2130034       138293
         107   emcpowera1   415633408     1663361024     2390932       405262

Compared to iostat:

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
emcpowerf        30.48      1041.37        42.65   76301848    3124800
emcpowerf1       37.90      1041.37        42.65   76301744    3124800
emcpowere        31.15      1041.53        48.58   76313104    3559152
emcpowere1       38.68      1041.53        48.58   76313048    3559136
emcpowerd        30.84      1041.30        48.95   76296808    3586912
emcpowerd1       38.68      1041.30        48.95   76296584    3586912
emcpowerc        31.09      1041.41        45.28   76304448    3317792
emcpowerc1       38.29      1041.41        45.28   76304272    3317776
emcpowerb        30.44      1041.27        41.69   76294352    3054624
emcpowerb1       37.76      1041.27        41.69   76294224    3054616
emcpowera        30.96      1041.48        44.38   76309640    3251928
emcpowera1       38.17      1041.48        44.38   76309528    3251920


----------------------------------------------------------------------

Comment By: Nobody/Anonymous (nobody)
Date: 2008-12-01 16:09

Message:
This is on x86_64, we're stuck with RHEL4 for a software dependency at this
time.  /proc/diskstats:
 120   81 emcpowerf1 21521451 414827720 4062174 32525904
 120   64 emcpowere 7418717 14126751 414902160 18320375 1498987 3022982
36205640 111638019 0 17752168 129958270
 120   65 emcpowere1 21545429 414901416 4521983 36205568
 120   48 emcpowerd 7350850 14172661 414848488 18193260 1490998 3062052
36454320 109701070 0 17408097 127894242
 120   49 emcpowerd1 21523476 414847288 4553079 36454288
 120   32 emcpowerc 7422037 14127301 414918488 18739044 1428404 2800527
33862072 110916401 0 18013412 129655362
 120   33 emcpowerc1 21549283 414917320 4228945 33861976
 120   16 emcpowerb 7346170 14173469 414815584 17641189 1223258 2722997
31601008 110332100 0 16689640 127973255
 120   17 emcpowerb1 21519582 414814720 3946267 31600968
 120    0 emcpowera 7434117 14148634 415464320 19055514 1390748 2793711
34006144 113232948 0 18088299 132288407
 120    1 emcpowera1 21582682 415463192 4174253 33837496


----------------------------------------------------------------------

Comment By: Jan Safranek (jsafranek)
Date: 2008-11-26 12:37

Message:
net-snmp-5.1.2 is really old and it is not supported anymore. If possible,
please try it with any recent version of net-snmp.

The code in these parts did not change much though, can you at least post
content of your /proc/diskstats? And what architecture do you use
(x86_64/i386/ppc...)?

----------------------------------------------------------------------

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