[DRBD-user] Question about the 'ping' mechanism

Stefan Seifert nine at detonation.org
Tue Mar 17 10:53:56 CET 2009

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

On Tuesday 17 March 2009 10:39:15 Lars Ellenberg wrote:

> rather implement a "ping to disk".
> have one file / block on the drbd, and write to that every few seconds.
> then DRBD can detect if the actual remote _disk_ is responding,
> and not just the kernel thread ;-)
> and its just a matter of
>  cd /into/mounted/drbd
>  while sleep 10; do
> 	dd conv=fsync if=/dev/zero of=__probe__ bs=1b count=1
>  done

Wouldn't a simple: while sleep 10; do touch __probe__ ; done
be enough? Updates to meta data are sufficient to write something to the disk 
and the dd-call has to write that byte _and_ update the meta data.

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