[DRBD-user] drbd slow I/O with lustre filesystem

Charlie Schluting charlie at linbit.com
Thu Oct 1 17:40:04 CEST 2009

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

Dam Thanh Tung wrote:
> After synchronizing a couple of our disk, we reformat it with lustre
> file system format and start copying our data to drbd disk, but its I/O
> wait is too high ( about 25% ) and the copy speed from our web client to
> drbd device is too slow, only about 13MB/s although we're using 1Gb
> Ethernet !!!

This blog entry has a few important tips:

Either al-extents or unplug-watermark would likely provide a huge boost
in performance.

There is also a webinar on performance tuning here:


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