[DRBD-user] Identifying High iowait on DRBD Computers

Florian Haas florian.haas at linbit.com
Thu Feb 17 20:13:12 CET 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On 02/17/2011 07:37 PM, Robinson, Eric wrote:
> Florian,
> 
>> Why wouldn't it be, say, the CFQ scheduler at work and you 
>> really ought to be using deadline?
>>
> 
> I saw a reference to that somewhere, but I think the question may be
> beyond my level at this point. How can I tell which is being used 

Explained here:

http://www.drbd.org/users-guide/s-latency-tuning.html#s-latency-tuning-deadline-scheduler

> and
> whether it is the culprit?

That's a bit trickier. :) But it's worth trying out and seeing what happens.

> Most importantly, in about two hours the old primary will finish its
> fsck and will start up and re-join the cluster as the new secondary.

I do hope this is a fsck on your root fs, not a fsck on the disconnected
DRBD device.

Well, actually, what I really hope is that you can soon upgrade that box
to use a journaling filesystem. And a recent DRBD. And Pacemaker. :)

Cheers,
Florian

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