[Linux-cluster] Kernel I/O scheduler

[Tom Mornini]

This is a really terrific question.

We use Coraid storage, and their driver operates below the I/O  
scheduler, which is a shame.

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On May 2, 2007, at 3:33 PM, Jeff Stoner wrote:

> Just a thought...anyone do any load testing with GFS (and non-GFS
> clusters) using different I/O schedulers (CFQ v Deadline v NOOP v as?)
>
> --Jeff
> Service Engineer
> OpSource Inc.
>
>
>> -----Original Message-----
>> Subject: Re: [Linux-cluster] reducing heartbeat interval
>>
>> garylua at singnet.com.sg wrote:
>>> Hi, hwo do i go about changing the heartbeat intervals for cluster
>>> suite for RHEL4? Is the minimum 5 seconds, or can i go even lower,
>>> like 1 sec? thanks
>>
>> cluster.conf parameters (eg):
>>
>> <cman hello_timer="1" deadnode_timer="10"/>
>>
>> The number are integer seconds so 1 is the smallest value you
>> can have. Before you put that into production though, check
>> it under load because high I/O or network loads can cause
>> spurious node "failures".
>>
>> see /proc/cluster/config/cman for all the changeable values.
>
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