[DRBD-user] [Q] What does it mean that bdev hardsect is the "wrong" size?

Philipp Reisner philipp.reisner at linbit.com
Fri May 27 10:30:19 CEST 2005

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

Am Donnerstag, 26. Mai 2005 16:06 schrieb Maurice Volaski:
> Here's a message I came across in my logs:
> May 20 15:16:28 [kernel] drbd4: Meta data's bdev hardsect_size != 512
> May 20 15:16:28 [kernel] drbd4: Workaround engaged (has performace impact).

What type of storage devices are you using ? 
disks/controller ?

I guess it is not SCSI, I guess it is not IDE, right ?

DRBD needs in its meta-data operations atomic updates of rather small units
of data on disk. Therefore DRBD's meta-data layout is somewhat optimized
for IO Subsystems with a sector-size (=small possible block size) of
512 byte. 

: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
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