Kernel statistic counters

[Geofrey Rainey]

You're welcome AJ.

Sar can be used in real time by typing something like "sar 1 100" (print
every second for 100 seconds).
Else it prints out the information from its database which it updates
every 10 mins by default.
This info can be viewed by typing "sar -q" for instance. You can also
view historical data with
The -f flag. The files are kept in /var/log/sa/sa<date>, ie, sar -q -f
/var/log/sa/sa09 (for 09th).

Regards, 
		
Geofrey Rainey
Systems Engineer
D. 64 9 916 7178
M. 64 21 563 106
geofrey.rainey at tvnz.co.nz


-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Alexandre Vieira
Sent: Wednesday, 11 February 2009 12:13 a.m.
To: General Red Hat Linux discussion list
Subject: Re: Kernel statistic counters

Hi Geofrey,

Thanks for the input.

I've started using collecting data in real time with system tools such
as sar and will process the data with a 2 week sample because there
doesn't seem to exist kernel counters resembling solaris kstat ones.

Regards,
AJ

On Sun, Feb 8, 2009 at 6:56 PM, Geofrey Rainey
<Geofrey.Rainey at tvnz.co.nz>wrote:

> Try "sar" from the package sysstat.
>
>
> -----Original Message-----
> From: redhat-list-bounces at redhat.com
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Alexandre Vieira
> Sent: Friday, 6 February 2009 5:34 a.m.
> To: redhat-list at redhat.com
> Subject: Kernel statistic counters
>
> Hi list,
>
> I'm auditing (dimensioning, security, stability, performance, etc) a 
> platform consisting of 4 RHEL machines and I'm having a hard time 
> finding some system statistics.
>
> I'm used to Solaris where you have the kstats counters with basically 
> everything.
>
> On linux I see that "ethtool -S ethX" gives me what I need for network

> stats. How about history counters on CPU activity, memory activity, 
> disk activity?
>
> Imagine I want to see sd0 disk error statistic:
>
> #kstat sderr:0
>
> module: sderr                           instance: 0
> name:   sd0,err                         class:    device_error
>        crtime                          42.406513208
>        Device Not Ready                0
>        Hard Errors                     0
>        Illegal Request                 0
>        Media Error                     0
>        No Device                       0
>        Predictive Failure Analysis     0
>        Product                         MAT3073N SUN72G
>        Recoverable                     0
>        Revision                        0602
>        Serial No                       0530B093ML
>        Size                            73400057856
>        snaptime                        59275843.5048492
>        Soft Errors                     0
>        Transport Errors                0
>        Vendor                          FUJITSU
>
> Or partition 0 (/) from sd0 disk activity:
>
> #kstat sd:0:sd0,a
> module: sd                              instance: 0
> name:   sd0,a                           class:    partition
>        crtime                          42.500566541
>        nread                           408078787784
>        nwritten                        770591441920
>        rcnt                            0
>        reads                           56436484
>        rlastupdate                     59275924.4385759
>        rlentime                        481828.942334242
>        rtime                           331623.611754405
>        snaptime                        59275924.4385759
>        wcnt                            0
>        wlastupdate                     59275924.4385759
>        wlentime                        990.922349888
>        writes                          35321509
>        wtime                           973.857852654
>
> Much appreciated for your time.
>
> Regards
> AJ
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--
Alexandre Vieira - nullpt at gmail.com
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