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Commit 65d94927 authored by Philipp Reisner's avatar Philipp Reisner
Browse files

drbd: Changed some defaults 



* Enabled the resync controller, with a fill target of 50Kib. That gives
  reasonable resync speeds without tuning. A much better default than
  the 250KiB/s fixed.

* Enable bitmap compression. It is save to use, and most people have
  more CPU power than network bandwidth.

* ko-count of 7: Abort a connection if the peer fails to process a
  write request within 42 seconds.

* al-extents of 1237: ~5 GiB seems to be a much more sane default
  these days.

Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent 367d675d

include/linux/drbd_limits.h

+7 −7
Original line number Diff line number Diff line
@@ -16,7 +16,7 @@ 
#define DEBUG_RANGE_CHECK 0



#define DRBD_MINOR_COUNT_MIN 1

#define DRBD_MINOR_COUNT_MAX 256

#define DRBD_MINOR_COUNT_MAX (1U << 20)

#define DRBD_MINOR_COUNT_DEF 32



#define DRBD_VOLUME_MAX 65535
@@ -99,7 +99,7 @@ 
   * 200 should be more than enough even for very short timeouts */

#define DRBD_KO_COUNT_MIN  0

#define DRBD_KO_COUNT_MAX  200

#define DRBD_KO_COUNT_DEF  0

#define DRBD_KO_COUNT_DEF  7

/* } */



/* syncer { */
@@ -117,7 +117,7 @@ 
   * 919 * 7 = 6433 */

#define DRBD_AL_EXTENTS_MIN  7

#define DRBD_AL_EXTENTS_MAX  6433

#define DRBD_AL_EXTENTS_DEF  127

#define DRBD_AL_EXTENTS_DEF  1237



#define DRBD_MINOR_NUMBER_MIN  -1

#define DRBD_MINOR_NUMBER_MAX  (1<<30)
@@ -151,7 +151,7 @@ 


#define DRBD_C_PLAN_AHEAD_MIN  0

#define DRBD_C_PLAN_AHEAD_MAX  300

#define DRBD_C_PLAN_AHEAD_DEF  0 /* RS rate controller disabled by default */

#define DRBD_C_PLAN_AHEAD_DEF  20



#define DRBD_C_DELAY_TARGET_MIN 1

#define DRBD_C_DELAY_TARGET_MAX 100
@@ -159,7 +159,7 @@ 


#define DRBD_C_FILL_TARGET_MIN 0

#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */

#define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */

#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */



#define DRBD_C_MAX_RATE_MIN     250 /* kByte/sec */

#define DRBD_C_MAX_RATE_MAX     (4 << 20)
@@ -167,7 +167,7 @@ 


#define DRBD_C_MIN_RATE_MIN     0 /* kByte/sec */

#define DRBD_C_MIN_RATE_MAX     (4 << 20)

#define DRBD_C_MIN_RATE_DEF     4096

#define DRBD_C_MIN_RATE_DEF     250



#define DRBD_CONG_FILL_MIN	0

#define DRBD_CONG_FILL_MAX	(10<<21) /* 10GByte in sectors */
@@ -187,6 +187,6 @@ 


#define DRBD_ALLOW_TWO_PRIMARIES_DEF	0

#define DRBD_ALWAYS_ASBP_DEF	0

#define DRBD_USE_RLE_DEF	0

#define DRBD_USE_RLE_DEF	1



#endif