[DRBD-user] how long does drbd device do sync

Mark Watts m.watts at eris.qinetiq.com
Thu May 10 15:38:23 CEST 2007

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


> On Thu, May 10, 2007 at 02:21:53PM +0100, Mark Watts wrote:
> > > On Thu, May 10, 2007 at 01:05:54PM +0100, Mark Watts wrote:
> > > > > > It can be one of the following three:
> > > > > >
> > > > > >    C: write IO is reported as completed, if we know it has
> > > > > >       reached _both_ local and remote DISK.
> > > > > >       * for critical transactional data.
> > > > >
> > > > >        * for most cases.
> > > >
> > > > Most ?
> > >
> > > what is your question?
> >
> >    C: write IO is reported as completed, if we know it has
> >        reached _both_ local and remote DISK.
> >
> >        * for most cases.
> >
> > In what circumstances does this not hold to be true (that data is on the
> > platters of both disks?)
>
> 1. misunderstanding:
> in that post, read the "*" as "this setting is recommended ..."

No, just cut'n'paste from the drbd.conf file :o)

> 2.
> the statement holds not true when you lose connectivity,
> obviously: if you cannot communicate with the peer,
> it cannot write your data.

Ah I see. I half expected you to be referring to some kind of rare 
corner-case.

Thanks for clarifying.

Mark.

-- 
Mark Watts BSc RHCE MBCS
Senior Systems Engineer
QinetiQ Trusted Information Management
Trusted Solutions and Services Group
GPG Key: http://keyserver.veridis.com:11371/search?q=0x455420ED
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