Use of ramdisk

[Atul Gosain]

I refered to this documentation.
http://nagios.sourceforge.net/docs/1_0/tuning.html

This para specifies that
*Use a ramdisk for holding status data*. If you're using the standard 
status log 
<http://nagios.sourceforge.net/docs/1_0/configmain.html#status_file> and 
you're /not/ using aggregated status updates, consider putting the 
directory where the status log is stored on a ramdisk. This will speed 
things up quite a bit (in both the core program and the CGIs) because it 
saves a lot of interrupts and disk thrashing.

Regards
Atul

Fredrik Wänglund wrote:


>If i got the thing right, Nagios updates the log-file each time a check is done, and if archiving i enabled the file is copied to the archive at regular intervals.
>This means that the file that Nagios works with should always be cached, and therefore putting it in an RAM-disk would not give any more performance (probably slightly less).
>
>
>/FredrikW
>
>
>-----Original Message-----
>From:	Atul Gosain [mailto:atul at mindsw.com]
>Sent:	Thu 13-Feb-03 11:09
>To:	Fredrik Wänglund
>Cc:	
>Subject:	Re: [Nagios-users] Use of ramdisk
>Hi
>
>Im not using check_snmp plugin for any service checks, allthough im 
>using mrtg on this server which uses a lot of snmp checks.
>In the nagios plugins, most commonly i see a load increase when 
>check_dhcp plugin executes. It puts too much load.
>Has anybody used check_dhcp before. Allthough its serving my purpose but 
>taking too much load on cpu.
>What do u say.
>Again, will the usage of ram disk feasible in short time.
>Anybody???
>
>Regards
>Atul
>Fredrik Wänglund wrote:
>
>  
>
>>What type of checks are you doing? My system-load decreased dramatically when I changed the check_snmp plugin to not load the mib-list all the time (change the line '#define DEFAULT_MIBLIST "ALL"' to '#define DEFAULT_MIBLIST "NONE"')
>>
>>Regarding the use of RAM-disk, the biggest drawback is that it uses RAM. I dont know how much space you need - On my server the directory var/archives contains logiles from jan 13 to today and takes up about 28Mb
>>
>>
>>/FredrikW
>>
>>-----Original Message-----
>>From:	Atul Gosain [mailto:atul at mindsw.com]
>>Sent:	Thu 13-Feb-03 08:57
>>To:	nagios
>>Cc:	
>>Subject:	[Nagios-users] Use of ramdisk
>>Hi
>>
>>Im using Nagios to monitor about 35 hosts and 250 services on my network.
>>The server is P-3 500Mhz and 256 mb memory running Redhat Linux 7.2 and 
>>kernel version of 2.4.7-10.
>>The CPU load of the server used for monitoring is increasing day by day. 
>>We have allready tried to optimize the services checks delay etc, but 
>>still there needs to be some optimization.
>>
>>I have seen the page in the documentation of Nagios about tuning the 
>>performance.
>>Im left with an option of going for the ramdisk for storing the logs. 
>>Has anybody used Ramdisk before.
>>What are implications of using ramdisk??
>>Please advice.
>>
>>Thanks
>>Atul.
>>
>> 
>>
>>    
>>
>
>
>  
>


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