[DRBD-user] Re: strange performance problems with drbd

Torsten Neumann torsten.neumann at dlh.de
Mon May 8 10:27:56 CEST 2006

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

Francis I. Malolot <francis_m at ...> writes:

> >>>When putting linux software raid5 on top it goes unusable slow
> Raid 5 slow performance is normal especially write because
> it must read overhead blocks in the stripe to recreate the parity block.
> Please look where is  the bottleneck.

disk write without drbd 40MB/sec
disk write with drbd (recent kernel) ~ 3MB/sec (gigabit link)

So how can I check why drbd slows things so terrible down? Yes there is a
bottleneck. But without drbd all seems fine, with drbd not.

Thanks for helping

More information about the drbd-user mailing list