[DRBD-user] blocking I/O with drbd

Felix Frank ff at mpexnet.de
Fri Dec 16 14:50:14 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 12/16/2011 02:45 PM, Volker wrote:
> For the '/sys/block/dm-[0,1,2]' i do not have a scheduler-file. Only for
> /dev/sd[a,b]

that sounds about right. I disbelieve that Linux runs disk I/O
schedulers on LVs, that would be doubled effort.

> What surprises me the most is the delay between the load rising and the
> finished dd. a short timeline to make myself clear:

To rid yourself of surprises, either pass the oflag=direct to dd or
follow it by a call to `sync`.


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