[DRBD-user] DRBD on top of LVM - 50% performace drop

trekker.dk at abclinuxu.cz trekker.dk at abclinuxu.cz
Sun Sep 12 20:41:22 CEST 2010

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

Joshua West wrote:
> J.B.,
> Are you making use of LVM snapshots by any chance? I've read reports of
> extremely awful performance as a result of LVM2 CoW code -- whether
> you're on the trunk volume or any snapshot volumes:
> http://www.nikhef.nl/~dennisvd/lvmcrap.html
> 1GB took 20sec to write w/o snapshots, 16min with snapshots!
> If you're using LVM snapshots on that host, then perhaps that explains
> the performance penalties you've noticed.

Nope, no snapshots.

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