What is maxreqs parameter in AIX? Post: 302462833

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Operating Systems AIX What is maxreqs parameter in AIX? Post 302462833 by zaxxon on Friday 15th of October 2010 06:55:04 AM

10-15-2010

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It is the current maximum of asynchronous I/O requests that can be either waiting to be processed or are currently processed.

There is an explicit ORA error message (I forgot the error code) that can be searched on Metalink or in Oracle documentation, that points that this threshold has been hit and should be raised.

Usually on older versions of AIX this is per default 4096, I think from AIX 6 on it is 16384.
It is definetly a parameter that could and should be set to a higher values. That is why they have set the default value in AIX 6 to a 4 times higher value.

You can monitor this with

Code:

> iostat -A 1 | awk '/avg/ {if(x!=1){print; getline; print; x=1}else{getline; print}}'
aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait
     1624.1  0.0   349     0    32768            31.4  11.6   45.8     11.2
     908.0  0.0     7     0    32768            32.1  11.1   50.6      6.2
     1565.7  0.0   263     0    32768            41.3  15.7   34.5      8.5
     1408.0  0.0   316     0    32768            34.2  12.8   45.5      7.5
     1055.0  0.0    49     0    32768            36.6  13.5   41.7      8.2
     1818.3  0.0   290     0    32768            31.3  12.1   46.8      9.9

From the man page of iostat:

Code:

Asynchronous I/O report

       The asynchronous I/O report has the following column headers :
       avgc
            Average global AIO request count per second for the specified interval.
       avfc
            Average fastpath request count per second for the specified interval.
       maxgc
            Maximum global AIO request count since the last time this value was fetched.
       maxfc
            Maximum fastpath request count since the last time this value was fetched.
       maxreqs
            Maximum AIO requests allowed.

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LEARN ABOUT DEBIAN

nfsiostat

nfsiostat(8)						      System Manager's Manual						      nfsiostat(8)

NAME

       nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats

SYNOPSIS

       nfsiostat [[<interval>] [<count>]] [<options>][<mount_point>]

DESCRIPTION

       The nfsiostat command displays NFS client per-mount statisitics.

       <interval>
	      specifies the amount of time in seconds between each report.  The first report contains statistics for the time since each file sys-
	      tem was mounted.	Each subsequent report contains statistics collected during the interval since the previous report.

       <count>
	      If the <count> parameter is specified, the value of <count> determines the number of reports generated at <interval> seconds  apart.
	      if the interval parameter is specified without the <count> parameter, the command generates reports continuously.

       <options>
	      Define below

       <mount_point>
	      If  one  or  more  <mount  point> names are specified, statistics for only these mount points will be displayed.	Otherwise, all NFS
	      mount points on the client are listed.

OPTIONS

       -a  or  --attr
	      displays statistics related to the attribute cache

       -d  or  --dir
	      displays statistics related to directory operations

       -h  or  --help
	      shows help message and exit

       -l LIST or  --list=LIST
	      only print stats for first LIST mount points

       -p  or  --page
	      displays statistics related to the page cache

       -s  or  --sort
	      Sort NFS mount points by ops/second

       --version
	      show program's version number and exit

FILES

       /proc/self/mountstats

SEE ALSO

       iostat(8), mountstats(8), nfsstat(8)

AUTHOR

       Chuck Lever <chuck.lever@oracle.com>

								    15 Apr 2010 						      nfsiostat(8)

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