[DRBD-announce] drbd-0.7.19.tar.gz

Philipp Reisner philipp.reisner at linbit.com
Wed May 24 14:37:12 CEST 2006

And an other maintenance release...

0.7.19 (api:78/proto:74)
 * Fixed a bug where lc_del() left a list poison in an LRU chache's
   hash table. The only way to trigger this bug was:
   up (>>200M), primary, mkfs, resize to 200M, down, up
 * DRBD now propagates the backing storage's read ahead properties
   to upper layers. With devices that read very fast, this is 
 * GFP_KERNEL was changed to GFP_NOIO in a few places, to make it
   more save against deadlocks in the memory subsystem.

The trigger for this release to happen was the enormous difference
in read performance we experienced at a customer's site.

  With some nice hardware the system there achieved 320MB/sec 
  read performance. With drbd-0.7.18 on top of DRBD we got only
  about 70MB/sec read performance, while with that modification
  in 0.7.19 we can get the whole 320MB/sec out of DRBD as well.


: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
: Schönbrunnerstr 244, 1120 Vienna, Austria    http://www.linbit.com :

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