[DRBD-user] difference in speed when using external metadata

Bart Coninckx bart.coninckx at telenet.be
Mon Jan 10 20:31:44 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 Monday 10 January 2011 19:40:17 J. Ryan Earl wrote:
> On Sun, Jan 9, 2011 at 10:03 AM, Bart Coninckx 
<bart.coninckx at telenet.be>wrote:
> > Hi all,
> > 
> > am reading the Novell docs on DRBD and one of the ways they mention to
> > speed
> > up DRBD is using external metadata. Possibly a hard question to answer
> > but could someone indicate by what degree this would enhance speed
> > (provided using
> > a sufficient fast disk for the metadata, like a SSD)?
> > 
> > thx!
> > 
> > Bart
> A RAID controller with a backed-write cache essentially nullifies
> any advantage there.  A RAID controller that can instantly return on
> FUA-writes is what you want.
> -JR


so the essence of your answer is that this is not a matter of having metadata 
internal or external, but rather of having the right RAID controller?
Do you have examples of these in the major brands (HP, Dell, ...) ?



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