include/linux/drbd_limits.h - third_party/kernel - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
   drbd_limits.h
   This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
 */

 /*
  * Our current limitations.
  * Some of them are hard limits,
  * some of them are arbitrary range limits, that make it easier to provide
  * feedback about nonsense settings for certain configurable values.
  */

 #ifndef DRBD_LIMITS_H
 #define DRBD_LIMITS_H 1

 #define DEBUG_RANGE_CHECK 0

 #define DRBD_MINOR_COUNT_MIN 1
 #define DRBD_MINOR_COUNT_MAX 255
 #define DRBD_MINOR_COUNT_DEF 32
 #define DRBD_MINOR_COUNT_SCALE '1'

 #define DRBD_VOLUME_MAX 65535

 #define DRBD_DIALOG_REFRESH_MIN 0
 #define DRBD_DIALOG_REFRESH_MAX 600
 #define DRBD_DIALOG_REFRESH_SCALE '1'

 /* valid port number */
 #define DRBD_PORT_MIN 1
 #define DRBD_PORT_MAX 0xffff
 #define DRBD_PORT_SCALE '1'

 /* startup { */
   /* if you want more than 3.4 days, disable */
 #define DRBD_WFC_TIMEOUT_MIN 0
 #define DRBD_WFC_TIMEOUT_MAX 300000
 #define DRBD_WFC_TIMEOUT_DEF 0
 #define DRBD_WFC_TIMEOUT_SCALE '1'

 #define DRBD_DEGR_WFC_TIMEOUT_MIN 0
 #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
 #define DRBD_DEGR_WFC_TIMEOUT_DEF 0
 #define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'

 #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
 #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
 #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
 #define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
 /* }*/

 /* net { */
   /* timeout, unit centi seconds
    * more than one minute timeout is not useful */
 #define DRBD_TIMEOUT_MIN 1
 #define DRBD_TIMEOUT_MAX 600
 #define DRBD_TIMEOUT_DEF 60       /* 6 seconds */
 #define DRBD_TIMEOUT_SCALE '1'

  /* If backing disk takes longer than disk_timeout, mark the disk as failed */
 #define DRBD_DISK_TIMEOUT_MIN 0    /* 0 = disabled */
 #define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
 #define DRBD_DISK_TIMEOUT_DEF 0    /* disabled */
 #define DRBD_DISK_TIMEOUT_SCALE '1'

   /* active connection retries when C_WF_CONNECTION */
 #define DRBD_CONNECT_INT_MIN 1
 #define DRBD_CONNECT_INT_MAX 120
 #define DRBD_CONNECT_INT_DEF 10   /* seconds */
 #define DRBD_CONNECT_INT_SCALE '1'

   /* keep-alive probes when idle */
 #define DRBD_PING_INT_MIN 1
 #define DRBD_PING_INT_MAX 120
 #define DRBD_PING_INT_DEF 10
 #define DRBD_PING_INT_SCALE '1'

  /* timeout for the ping packets.*/
 #define DRBD_PING_TIMEO_MIN  1
 #define DRBD_PING_TIMEO_MAX  300
 #define DRBD_PING_TIMEO_DEF  5
 #define DRBD_PING_TIMEO_SCALE '1'

   /* max number of write requests between write barriers */
 #define DRBD_MAX_EPOCH_SIZE_MIN 1
 #define DRBD_MAX_EPOCH_SIZE_MAX 20000
 #define DRBD_MAX_EPOCH_SIZE_DEF 2048
 #define DRBD_MAX_EPOCH_SIZE_SCALE '1'

   /* I don't think that a tcp send buffer of more than 10M is useful */
 #define DRBD_SNDBUF_SIZE_MIN  0
 #define DRBD_SNDBUF_SIZE_MAX  (10<<20)
 #define DRBD_SNDBUF_SIZE_DEF  0
 #define DRBD_SNDBUF_SIZE_SCALE '1'

 #define DRBD_RCVBUF_SIZE_MIN  0
 #define DRBD_RCVBUF_SIZE_MAX  (10<<20)
 #define DRBD_RCVBUF_SIZE_DEF  0
 #define DRBD_RCVBUF_SIZE_SCALE '1'

   /* @4k PageSize -> 128kB - 512MB */
 #define DRBD_MAX_BUFFERS_MIN  32
 #define DRBD_MAX_BUFFERS_MAX  131072
 #define DRBD_MAX_BUFFERS_DEF  2048
 #define DRBD_MAX_BUFFERS_SCALE '1'

   /* @4k PageSize -> 4kB - 512MB */
 #define DRBD_UNPLUG_WATERMARK_MIN  1
 #define DRBD_UNPLUG_WATERMARK_MAX  131072
 #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
 #define DRBD_UNPLUG_WATERMARK_SCALE '1'

   /* 0 is disabled.
    * 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  7
 #define DRBD_KO_COUNT_SCALE '1'
 /* } */

 /* syncer { */
   /* FIXME allow rate to be zero? */
 #define DRBD_RESYNC_RATE_MIN 1
 /* channel bonding 10 GbE, or other hardware */
 #define DRBD_RESYNC_RATE_MAX (4 << 20)
 #define DRBD_RESYNC_RATE_DEF 250
 #define DRBD_RESYNC_RATE_SCALE 'k'  /* kilobytes */

 #define DRBD_AL_EXTENTS_MIN  67
   /* we use u16 as "slot number", (u16)~0 is "FREE".
    * If you use >= 292 kB on-disk ring buffer,
    * this is the maximum you can use: */
 #define DRBD_AL_EXTENTS_MAX  0xfffe
 #define DRBD_AL_EXTENTS_DEF  1237
 #define DRBD_AL_EXTENTS_SCALE '1'

 #define DRBD_MINOR_NUMBER_MIN  -1
 #define DRBD_MINOR_NUMBER_MAX  ((1 << 20) - 1)
 #define DRBD_MINOR_NUMBER_DEF  -1
 #define DRBD_MINOR_NUMBER_SCALE '1'

 /* } */

 /* drbdsetup XY resize -d Z
  * you are free to reduce the device size to nothing, if you want to.
  * the upper limit with 64bit kernel, enough ram and flexible meta data
  * is 1 PiB, currently. */
 /* DRBD_MAX_SECTORS */
 #define DRBD_DISK_SIZE_MIN  0
 #define DRBD_DISK_SIZE_MAX  (1 * (2LLU << 40))
 #define DRBD_DISK_SIZE_DEF  0 /* = disabled = no user size... */
 #define DRBD_DISK_SIZE_SCALE 's'  /* sectors */

 #define DRBD_ON_IO_ERROR_DEF EP_DETACH
 #define DRBD_FENCING_DEF FP_DONT_CARE
 #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
 #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
 #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
 #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
 #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
 #define DRBD_ON_CONGESTION_DEF OC_BLOCK
 #define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL

 #define DRBD_MAX_BIO_BVECS_MIN 0
 #define DRBD_MAX_BIO_BVECS_MAX 128
 #define DRBD_MAX_BIO_BVECS_DEF 0
 #define DRBD_MAX_BIO_BVECS_SCALE '1'

 #define DRBD_C_PLAN_AHEAD_MIN  0
 #define DRBD_C_PLAN_AHEAD_MAX  300
 #define DRBD_C_PLAN_AHEAD_DEF  20
 #define DRBD_C_PLAN_AHEAD_SCALE '1'

 #define DRBD_C_DELAY_TARGET_MIN 1
 #define DRBD_C_DELAY_TARGET_MAX 100
 #define DRBD_C_DELAY_TARGET_DEF 10
 #define DRBD_C_DELAY_TARGET_SCALE '1'

 #define DRBD_C_FILL_TARGET_MIN 0
 #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
 #define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
 #define DRBD_C_FILL_TARGET_SCALE 's'  /* sectors */

 #define DRBD_C_MAX_RATE_MIN     250
 #define DRBD_C_MAX_RATE_MAX     (4 << 20)
 #define DRBD_C_MAX_RATE_DEF     102400
 #define DRBD_C_MAX_RATE_SCALE	'k'  /* kilobytes */

 #define DRBD_C_MIN_RATE_MIN     0
 #define DRBD_C_MIN_RATE_MAX     (4 << 20)
 #define DRBD_C_MIN_RATE_DEF     250
 #define DRBD_C_MIN_RATE_SCALE	'k'  /* kilobytes */

 #define DRBD_CONG_FILL_MIN	0
 #define DRBD_CONG_FILL_MAX	(10<<21) /* 10GByte in sectors */
 #define DRBD_CONG_FILL_DEF	0
 #define DRBD_CONG_FILL_SCALE	's'  /* sectors */

 #define DRBD_CONG_EXTENTS_MIN	DRBD_AL_EXTENTS_MIN
 #define DRBD_CONG_EXTENTS_MAX	DRBD_AL_EXTENTS_MAX
 #define DRBD_CONG_EXTENTS_DEF	DRBD_AL_EXTENTS_DEF
 #define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE

 #define DRBD_PROTOCOL_DEF DRBD_PROT_C

 #define DRBD_DISK_BARRIER_DEF	0
 #define DRBD_DISK_FLUSHES_DEF	1
 #define DRBD_DISK_DRAIN_DEF	1
 #define DRBD_MD_FLUSHES_DEF	1
 #define DRBD_TCP_CORK_DEF	1
 #define DRBD_AL_UPDATES_DEF     1

 /* We used to ignore the discard_zeroes_data setting.
  * To not change established (and expected) behaviour,
  * by default assume that, for discard_zeroes_data=0,
  * we can make that an effective discard_zeroes_data=1,
  * if we only explicitly zero-out unaligned partial chunks. */
 #define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1

 /* Some backends pretend to support WRITE SAME,
  * but fail such requests when they are actually submitted.
  * This is to tell DRBD to not even try. */
 #define DRBD_DISABLE_WRITE_SAME_DEF 0

 #define DRBD_ALLOW_TWO_PRIMARIES_DEF	0
 #define DRBD_ALWAYS_ASBP_DEF	0
 #define DRBD_USE_RLE_DEF	1
 #define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0

 #define DRBD_AL_STRIPES_MIN     1
 #define DRBD_AL_STRIPES_MAX     1024
 #define DRBD_AL_STRIPES_DEF     1
 #define DRBD_AL_STRIPES_SCALE   '1'

 #define DRBD_AL_STRIPE_SIZE_MIN   4
 #define DRBD_AL_STRIPE_SIZE_MAX   16777216
 #define DRBD_AL_STRIPE_SIZE_DEF   32
 #define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */

 #define DRBD_SOCKET_CHECK_TIMEO_MIN 0
 #define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
 #define DRBD_SOCKET_CHECK_TIMEO_DEF 0
 #define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'

 #define DRBD_RS_DISCARD_GRANULARITY_MIN 0
 #define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20)  /* 1MiByte */
 #define DRBD_RS_DISCARD_GRANULARITY_DEF 0     /* disabled by default */
 #define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */

 #endif
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	drbd_limits.h
	This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
	*/

	/*
	* Our current limitations.
	* Some of them are hard limits,
	* some of them are arbitrary range limits, that make it easier to provide
	* feedback about nonsense settings for certain configurable values.
	*/

	#ifndef DRBD_LIMITS_H
	#define DRBD_LIMITS_H 1

	#define DEBUG_RANGE_CHECK 0

	#define DRBD_MINOR_COUNT_MIN 1
	#define DRBD_MINOR_COUNT_MAX 255
	#define DRBD_MINOR_COUNT_DEF 32
	#define DRBD_MINOR_COUNT_SCALE '1'

	#define DRBD_VOLUME_MAX 65535

	#define DRBD_DIALOG_REFRESH_MIN 0
	#define DRBD_DIALOG_REFRESH_MAX 600
	#define DRBD_DIALOG_REFRESH_SCALE '1'

	/* valid port number */
	#define DRBD_PORT_MIN 1
	#define DRBD_PORT_MAX 0xffff
	#define DRBD_PORT_SCALE '1'

	/* startup { */
	/* if you want more than 3.4 days, disable */
	#define DRBD_WFC_TIMEOUT_MIN 0
	#define DRBD_WFC_TIMEOUT_MAX 300000
	#define DRBD_WFC_TIMEOUT_DEF 0
	#define DRBD_WFC_TIMEOUT_SCALE '1'

	#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
	#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
	#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
	#define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'

	#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
	#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
	#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
	#define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
	/* }*/

	/* net { */
	/* timeout, unit centi seconds
	* more than one minute timeout is not useful */
	#define DRBD_TIMEOUT_MIN 1
	#define DRBD_TIMEOUT_MAX 600
	#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
	#define DRBD_TIMEOUT_SCALE '1'

	/* If backing disk takes longer than disk_timeout, mark the disk as failed */
	#define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */
	#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
	#define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */
	#define DRBD_DISK_TIMEOUT_SCALE '1'

	/* active connection retries when C_WF_CONNECTION */
	#define DRBD_CONNECT_INT_MIN 1
	#define DRBD_CONNECT_INT_MAX 120
	#define DRBD_CONNECT_INT_DEF 10 /* seconds */
	#define DRBD_CONNECT_INT_SCALE '1'

	/* keep-alive probes when idle */
	#define DRBD_PING_INT_MIN 1
	#define DRBD_PING_INT_MAX 120
	#define DRBD_PING_INT_DEF 10
	#define DRBD_PING_INT_SCALE '1'

	/* timeout for the ping packets.*/
	#define DRBD_PING_TIMEO_MIN 1
	#define DRBD_PING_TIMEO_MAX 300
	#define DRBD_PING_TIMEO_DEF 5
	#define DRBD_PING_TIMEO_SCALE '1'

	/* max number of write requests between write barriers */
	#define DRBD_MAX_EPOCH_SIZE_MIN 1
	#define DRBD_MAX_EPOCH_SIZE_MAX 20000
	#define DRBD_MAX_EPOCH_SIZE_DEF 2048
	#define DRBD_MAX_EPOCH_SIZE_SCALE '1'

	/* I don't think that a tcp send buffer of more than 10M is useful */
	#define DRBD_SNDBUF_SIZE_MIN 0
	#define DRBD_SNDBUF_SIZE_MAX (10<<20)
	#define DRBD_SNDBUF_SIZE_DEF 0
	#define DRBD_SNDBUF_SIZE_SCALE '1'

	#define DRBD_RCVBUF_SIZE_MIN 0
	#define DRBD_RCVBUF_SIZE_MAX (10<<20)
	#define DRBD_RCVBUF_SIZE_DEF 0
	#define DRBD_RCVBUF_SIZE_SCALE '1'

	/* @4k PageSize -> 128kB - 512MB */
	#define DRBD_MAX_BUFFERS_MIN 32
	#define DRBD_MAX_BUFFERS_MAX 131072
	#define DRBD_MAX_BUFFERS_DEF 2048
	#define DRBD_MAX_BUFFERS_SCALE '1'

	/* @4k PageSize -> 4kB - 512MB */
	#define DRBD_UNPLUG_WATERMARK_MIN 1
	#define DRBD_UNPLUG_WATERMARK_MAX 131072
	#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
	#define DRBD_UNPLUG_WATERMARK_SCALE '1'

	/* 0 is disabled.
	* 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 7
	#define DRBD_KO_COUNT_SCALE '1'
	/* } */

	/* syncer { */
	/* FIXME allow rate to be zero? */
	#define DRBD_RESYNC_RATE_MIN 1
	/* channel bonding 10 GbE, or other hardware */
	#define DRBD_RESYNC_RATE_MAX (4 << 20)
	#define DRBD_RESYNC_RATE_DEF 250
	#define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */

	#define DRBD_AL_EXTENTS_MIN 67
	/* we use u16 as "slot number", (u16)~0 is "FREE".
	* If you use >= 292 kB on-disk ring buffer,
	* this is the maximum you can use: */
	#define DRBD_AL_EXTENTS_MAX 0xfffe
	#define DRBD_AL_EXTENTS_DEF 1237
	#define DRBD_AL_EXTENTS_SCALE '1'

	#define DRBD_MINOR_NUMBER_MIN -1
	#define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1)
	#define DRBD_MINOR_NUMBER_DEF -1
	#define DRBD_MINOR_NUMBER_SCALE '1'

	/* } */

	/* drbdsetup XY resize -d Z
	* you are free to reduce the device size to nothing, if you want to.
	* the upper limit with 64bit kernel, enough ram and flexible meta data
	* is 1 PiB, currently. */
	/* DRBD_MAX_SECTORS */
	#define DRBD_DISK_SIZE_MIN 0
	#define DRBD_DISK_SIZE_MAX (1 * (2LLU << 40))
	#define DRBD_DISK_SIZE_DEF 0 /* = disabled = no user size... */
	#define DRBD_DISK_SIZE_SCALE 's' /* sectors */

	#define DRBD_ON_IO_ERROR_DEF EP_DETACH
	#define DRBD_FENCING_DEF FP_DONT_CARE
	#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
	#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
	#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
	#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
	#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
	#define DRBD_ON_CONGESTION_DEF OC_BLOCK
	#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL

	#define DRBD_MAX_BIO_BVECS_MIN 0
	#define DRBD_MAX_BIO_BVECS_MAX 128
	#define DRBD_MAX_BIO_BVECS_DEF 0
	#define DRBD_MAX_BIO_BVECS_SCALE '1'

	#define DRBD_C_PLAN_AHEAD_MIN 0
	#define DRBD_C_PLAN_AHEAD_MAX 300
	#define DRBD_C_PLAN_AHEAD_DEF 20
	#define DRBD_C_PLAN_AHEAD_SCALE '1'

	#define DRBD_C_DELAY_TARGET_MIN 1
	#define DRBD_C_DELAY_TARGET_MAX 100
	#define DRBD_C_DELAY_TARGET_DEF 10
	#define DRBD_C_DELAY_TARGET_SCALE '1'

	#define DRBD_C_FILL_TARGET_MIN 0
	#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
	#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
	#define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */

	#define DRBD_C_MAX_RATE_MIN 250
	#define DRBD_C_MAX_RATE_MAX (4 << 20)
	#define DRBD_C_MAX_RATE_DEF 102400
	#define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */

	#define DRBD_C_MIN_RATE_MIN 0
	#define DRBD_C_MIN_RATE_MAX (4 << 20)
	#define DRBD_C_MIN_RATE_DEF 250
	#define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */

	#define DRBD_CONG_FILL_MIN 0
	#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
	#define DRBD_CONG_FILL_DEF 0
	#define DRBD_CONG_FILL_SCALE 's' /* sectors */

	#define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN
	#define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX
	#define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF
	#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE

	#define DRBD_PROTOCOL_DEF DRBD_PROT_C

	#define DRBD_DISK_BARRIER_DEF 0
	#define DRBD_DISK_FLUSHES_DEF 1
	#define DRBD_DISK_DRAIN_DEF 1
	#define DRBD_MD_FLUSHES_DEF 1
	#define DRBD_TCP_CORK_DEF 1
	#define DRBD_AL_UPDATES_DEF 1

	/* We used to ignore the discard_zeroes_data setting.
	* To not change established (and expected) behaviour,
	* by default assume that, for discard_zeroes_data=0,
	* we can make that an effective discard_zeroes_data=1,
	* if we only explicitly zero-out unaligned partial chunks. */
	#define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1

	/* Some backends pretend to support WRITE SAME,
	* but fail such requests when they are actually submitted.
	* This is to tell DRBD to not even try. */
	#define DRBD_DISABLE_WRITE_SAME_DEF 0

	#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0
	#define DRBD_ALWAYS_ASBP_DEF 0
	#define DRBD_USE_RLE_DEF 1
	#define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0

	#define DRBD_AL_STRIPES_MIN 1
	#define DRBD_AL_STRIPES_MAX 1024
	#define DRBD_AL_STRIPES_DEF 1
	#define DRBD_AL_STRIPES_SCALE '1'

	#define DRBD_AL_STRIPE_SIZE_MIN 4
	#define DRBD_AL_STRIPE_SIZE_MAX 16777216
	#define DRBD_AL_STRIPE_SIZE_DEF 32
	#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */

	#define DRBD_SOCKET_CHECK_TIMEO_MIN 0
	#define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
	#define DRBD_SOCKET_CHECK_TIMEO_DEF 0
	#define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'

	#define DRBD_RS_DISCARD_GRANULARITY_MIN 0
	#define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */
	#define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */
	#define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */

	#endif