[DRBD-user] Low drbd performance, ~50% of raw disk

Nils Juergens nils at muon.de
Thu Jan 31 11:44:09 CET 2013

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


Am 29.01.2013 12:59, schrieb bd at bc-bd.org:
> 	RAID5 from 4 10K SAS drives.

You might want to check your stripe size, IIRC drbd is limited to 128k
IO requests, so if you have a larger stripe size you may be getting a
lot of read-modify-write, wich would severly impact your performance.

If you have a BBU (battery backup unit) or a non-volatile cache for your
raid controller you might want to try these:


good luck,

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