[gpfsug-discuss] mmfsadm dump vfsstats - negative values

Oesterlin, Robert Robert.Oesterlin at nuance.com
Thu Apr 20 01:21:04 BST 2017


Hi Eric

Looks like your assumption is correct - no negative values from “mmfsadm eventsExporter mmpmon vfss”. I don’t normally view these via “mmfsadm”, I use the zimon stats. But, It’s a bug that should be fixed.

What’s the best way to get this fixed?

root at cnt-r01r07u15 ~]# mmfsadm eventsExporter mmpmon vfss
_response_ begin mmpmon vfss
_mmpmon::vfss_ _n_ 10.30.100.193 _nn_ cnt-r01r07u15 _rc_ 0 _t_ 1492647309 _tu_ 311964 _access_ 8472897 56529.874886 _close_ 1460223848 49854.938090 _create_ 2101927 155055.515041 _fclear_ 0 0.000000 _fsync_ 20 0.024288 _fsync_range_ 0 0.000000 _ftrunc_ 0 0.000000 _getattr_ 859626332 101183.720281 _link_ 2175473 625.343799 _lockctl_ 17326 5.229828 _lookup_ 200378610 1201985.264220 _map_lloff_ 220854519 8561.860515 _mkdir_ 817943 217390.170859 _mknod_ 3 0.001422 _open_ 1460217712 134812.649162 _read_ 3883163461 3971457.463527 _write_ 186078410 137927.496812 _mmapRead_ 17108947 10665.929860 _mmapWrite_ 0 0.000000 _aioRead_ 0 0.000000 _aioWrite_ 0 0.000000 _readdir_ 142262897 6999.189450 _readlink_ 485337171 2111.634286 _readpage_ 3646233600 14346.331414 _remove_ 4241324 93277.463798 _rename_ 350679 19334.235924 _rmdir_ 342042 2736.048976 _setacl_ 0 0.000000 _setattr_ 3709289 16963.901179 _symlink_ 161336 8522.670079 _unmap_ 3929805828 1735.740690 _writepage_ 0 0.000000 _tsfattr_ 0 0.000000 _tsfsattr_ 0 0.000000 _flock_ 0 0.000000 _setxattr_ 119 0.001042 _getxattr_ 4077218348 628418.213008 _listxattr_ 0 0.000000 _removexattr_ 15 0.000042 _encode_fh_ 0 0.000000 _decode_fh_ 0 0.000000 _get_dentry_ 0 0.000000 _get_parent_ 0 0.000000 _mount_ 0 0.000000 _statfs_ 2625497 214.309671 _sync_ 0 0.000000 _vget_ 0 0.000000
_response_ end

Bob Oesterlin
Sr Principal Storage Engineer, Nuance
507-269-0413



From: <gpfsug-discuss-bounces at spectrumscale.org> on behalf of IBM Spectrum Scale <scale at us.ibm.com>
Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date: Wednesday, April 19, 2017 at 7:10 PM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Cc: "gpfsug-discuss-bounces at spectrumscale.org" <gpfsug-discuss-bounces at spectrumscale.org>
Subject: [EXTERNAL] Re: [gpfsug-discuss] mmfsadm dump vfsstats - negative values

Bob,

I also noticed this recently.  I think it may be a simple matter of a printf()-like statement in the code that handles "mmfsadm vfsstats" using an incorrect conversion specifier --- one that treats the counter as signed instead of unsigned and treats the counter as being smaller than it really is.

To help confirm that hypothesis, could you please run the following commands on the node, at the same time, so the output can be compared:

# mmfsadm vfsstats

# mmfsadm eventsExporter mmpmon vfss

I believe the code that handles "mmfsadm eventsExporter mmpmon vfss" uses the correct printf()-like conversion specifier.  So, it should so good numbers where "mmfsadm vfsstats" shows negative numbers.

Regards, The Spectrum Scale (GPFS) team
Eric Agar

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From:        "Oesterlin, Robert" <Robert.Oesterlin at nuance.com>
To:        gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:        04/19/2017 07:16 PM
Subject:        [gpfsug-discuss] mmfsadm dump vfsstats - negative values
Sent by:        gpfsug-discuss-bounces at spectrumscale.org
________________________________



I assume the counter has wrapped on some of these - would a PMR fix this? (4.2.1)

[root at cnt-r01r07u15 ~]# mmfsadm vfsstats
vfs statistics currently enabled
started at: Fri Jan 27 16:22:02.702 2017
  duration: 7091405.800 sec

name                    calls  time per call     total time
-------------------- -------- -------------- --------------
access                8472691       0.006672   56529.863993
close                1460175509       0.000034   49854.695358
create                2101110       0.073797  155055.263775
fsync                      20       0.001214       0.024288
getattr              859449161       0.000118  101183.699413
link                  2175473       0.000287     625.343799
lockctl                 17326       0.000302       5.229828
lookup               200369809       0.005999 1201980.046683
map_lloff            220850355       0.000039    8561.791963
mkdir                  817894       0.265793  217390.095681
mknod                       3       0.000474       0.001422
open                 1460169409       0.000092  134811.724068
read                 -412143552       0.001023 3971403.879911
write                164739329       0.000829  136616.948900
mmapRead             17108252       0.000623   10665.877349
readdir              142261835       0.000049    6999.159121
readlink             485335656       0.000004    2111.627292
readpage             -648839570       0.000004   14346.195128
remove                4239806       0.022000   93277.124289
rename                 350671       0.055135   19334.226490
rmdir                  342019       0.008000    2736.037074
setattr               3709237       0.004573   16963.899331
symlink                160610       0.053061    8522.185175
unmap                -365476297       0.000000    1735.669373
setxattr                  119       0.000009       0.001042
getxattr             -218316996       0.000154  628416.355002
removexattr                15       0.000003       0.000042
statfs                2624067       0.000082     214.306646
fastOpen             1456944934       0.000000       0.000000
fastClose            1515612004       0.000000       0.000000
fastLookup           77981387       0.000000       0.000000
fastRead             -922882405       0.000000       0.000000
fastWrite            102606402       0.000000       0.000000
revalidate             899677       0.000000       0.000000
aio write sync       21331080       0.000061    1309.773528

Bob Oesterlin
Sr Principal Storage Engineer, Nuance
507-269-0413

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