Hi, 

As specified here: 

http://www.drbd.org/users-guide-8.3/s-latency-tuning.html

I'd like to tune some params. But, in:

echo deadline > /sys/block/device/queue/scheduler

what is 'device'? I have an LV on RAID as a DRBD back-end. Which of these 
devices do I change the scheduler of:

/dev/sda and /dev/sdb
/dev/md1
/dev/dm-3 (being a link to the LV in question.

And, do they interfere when one is CFQ and another deadline?

Another point is, are those /dev/dm-x devices consistent on reboots?

Thanks,

Wiebe


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