[DRBD-user] Snapshot with DRBD

drbd at bobich.net drbd at bobich.net
Thu Feb 14 12:42:19 CET 2008

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, 14 Feb 2008, Leroy van Logchem wrote:

>> Here, it tells LVM2 can be used for creating snapshots.
> Caution: LVM2 snapshots become very slow if the amount of changes increases 
> due copy-on-write. Add the additional seeks and you have a much lower write 
> speed left.
> The last time I tried it reduced the write speed to 15% of the normal 
> throughput.

Indeed, and the more snapshots you have, the worse it gets, because the 
overwritten data has to be copied to each of the snapshots, since they 
are just sparse undo logs.


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