linux/include/linux/drbd_limits.h
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   1/*
   2  drbd_limits.h
   3  This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   4*/
   5
   6/*
   7 * Our current limitations.
   8 * Some of them are hard limits,
   9 * some of them are arbitrary range limits, that make it easier to provide
  10 * feedback about nonsense settings for certain configurable values.
  11 */
  12
  13#ifndef DRBD_LIMITS_H
  14#define DRBD_LIMITS_H 1
  15
  16#define DEBUG_RANGE_CHECK 0
  17
  18#define DRBD_MINOR_COUNT_MIN 1
  19#define DRBD_MINOR_COUNT_MAX 256
  20#define DRBD_MINOR_COUNT_DEF 32
  21
  22#define DRBD_DIALOG_REFRESH_MIN 0
  23#define DRBD_DIALOG_REFRESH_MAX 600
  24
  25/* valid port number */
  26#define DRBD_PORT_MIN 1
  27#define DRBD_PORT_MAX 0xffff
  28
  29/* startup { */
  30  /* if you want more than 3.4 days, disable */
  31#define DRBD_WFC_TIMEOUT_MIN 0
  32#define DRBD_WFC_TIMEOUT_MAX 300000
  33#define DRBD_WFC_TIMEOUT_DEF 0
  34
  35#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
  36#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
  37#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
  38
  39#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
  40#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
  41#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
  42/* }*/
  43
  44/* net { */
  45  /* timeout, unit centi seconds
  46   * more than one minute timeout is not useful */
  47#define DRBD_TIMEOUT_MIN 1
  48#define DRBD_TIMEOUT_MAX 600
  49#define DRBD_TIMEOUT_DEF 60       /* 6 seconds */
  50
  51 /* If backing disk takes longer than disk_timeout, mark the disk as failed */
  52#define DRBD_DISK_TIMEOUT_MIN 0    /* 0 = disabled */
  53#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
  54#define DRBD_DISK_TIMEOUT_DEF 0    /* disabled */
  55
  56  /* active connection retries when C_WF_CONNECTION */
  57#define DRBD_CONNECT_INT_MIN 1
  58#define DRBD_CONNECT_INT_MAX 120
  59#define DRBD_CONNECT_INT_DEF 10   /* seconds */
  60
  61  /* keep-alive probes when idle */
  62#define DRBD_PING_INT_MIN 1
  63#define DRBD_PING_INT_MAX 120
  64#define DRBD_PING_INT_DEF 10
  65
  66 /* timeout for the ping packets.*/
  67#define DRBD_PING_TIMEO_MIN  1
  68#define DRBD_PING_TIMEO_MAX  300
  69#define DRBD_PING_TIMEO_DEF  5
  70
  71  /* max number of write requests between write barriers */
  72#define DRBD_MAX_EPOCH_SIZE_MIN 1
  73#define DRBD_MAX_EPOCH_SIZE_MAX 20000
  74#define DRBD_MAX_EPOCH_SIZE_DEF 2048
  75
  76  /* I don't think that a tcp send buffer of more than 10M is useful */
  77#define DRBD_SNDBUF_SIZE_MIN  0
  78#define DRBD_SNDBUF_SIZE_MAX  (10<<20)
  79#define DRBD_SNDBUF_SIZE_DEF  0
  80
  81#define DRBD_RCVBUF_SIZE_MIN  0
  82#define DRBD_RCVBUF_SIZE_MAX  (10<<20)
  83#define DRBD_RCVBUF_SIZE_DEF  0
  84
  85  /* @4k PageSize -> 128kB - 512MB */
  86#define DRBD_MAX_BUFFERS_MIN  32
  87#define DRBD_MAX_BUFFERS_MAX  131072
  88#define DRBD_MAX_BUFFERS_DEF  2048
  89
  90  /* @4k PageSize -> 4kB - 512MB */
  91#define DRBD_UNPLUG_WATERMARK_MIN  1
  92#define DRBD_UNPLUG_WATERMARK_MAX  131072
  93#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
  94
  95  /* 0 is disabled.
  96   * 200 should be more than enough even for very short timeouts */
  97#define DRBD_KO_COUNT_MIN  0
  98#define DRBD_KO_COUNT_MAX  200
  99#define DRBD_KO_COUNT_DEF  0
 100/* } */
 101
 102/* syncer { */
 103  /* FIXME allow rate to be zero? */
 104#define DRBD_RATE_MIN 1
 105/* channel bonding 10 GbE, or other hardware */
 106#define DRBD_RATE_MAX (4 << 20)
 107#define DRBD_RATE_DEF 250  /* kb/second */
 108
 109  /* less than 7 would hit performance unnecessarily.
 110   * 3833 is the largest prime that still does fit
 111   * into 64 sectors of activity log */
 112#define DRBD_AL_EXTENTS_MIN  7
 113#define DRBD_AL_EXTENTS_MAX  3833
 114#define DRBD_AL_EXTENTS_DEF  127
 115
 116#define DRBD_AFTER_MIN  -1
 117#define DRBD_AFTER_MAX  255
 118#define DRBD_AFTER_DEF  -1
 119
 120/* } */
 121
 122/* drbdsetup XY resize -d Z
 123 * you are free to reduce the device size to nothing, if you want to.
 124 * the upper limit with 64bit kernel, enough ram and flexible meta data
 125 * is 1 PiB, currently. */
 126/* DRBD_MAX_SECTORS */
 127#define DRBD_DISK_SIZE_SECT_MIN  0
 128#define DRBD_DISK_SIZE_SECT_MAX  (1 * (2LLU << 40))
 129#define DRBD_DISK_SIZE_SECT_DEF  0 /* = disabled = no user size... */
 130
 131#define DRBD_ON_IO_ERROR_DEF EP_PASS_ON
 132#define DRBD_FENCING_DEF FP_DONT_CARE
 133#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
 134#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
 135#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
 136#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
 137#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
 138#define DRBD_ON_CONGESTION_DEF OC_BLOCK
 139
 140#define DRBD_MAX_BIO_BVECS_MIN 0
 141#define DRBD_MAX_BIO_BVECS_MAX 128
 142#define DRBD_MAX_BIO_BVECS_DEF 0
 143
 144#define DRBD_C_PLAN_AHEAD_MIN  0
 145#define DRBD_C_PLAN_AHEAD_MAX  300
 146#define DRBD_C_PLAN_AHEAD_DEF  0 /* RS rate controller disabled by default */
 147
 148#define DRBD_C_DELAY_TARGET_MIN 1
 149#define DRBD_C_DELAY_TARGET_MAX 100
 150#define DRBD_C_DELAY_TARGET_DEF 10
 151
 152#define DRBD_C_FILL_TARGET_MIN 0
 153#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
 154#define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */
 155
 156#define DRBD_C_MAX_RATE_MIN     250 /* kByte/sec */
 157#define DRBD_C_MAX_RATE_MAX     (4 << 20)
 158#define DRBD_C_MAX_RATE_DEF     102400
 159
 160#define DRBD_C_MIN_RATE_MIN     0 /* kByte/sec */
 161#define DRBD_C_MIN_RATE_MAX     (4 << 20)
 162#define DRBD_C_MIN_RATE_DEF     4096
 163
 164#define DRBD_CONG_FILL_MIN      0
 165#define DRBD_CONG_FILL_MAX      (10<<21) /* 10GByte in sectors */
 166#define DRBD_CONG_FILL_DEF      0
 167
 168#define DRBD_CONG_EXTENTS_MIN   DRBD_AL_EXTENTS_MIN
 169#define DRBD_CONG_EXTENTS_MAX   DRBD_AL_EXTENTS_MAX
 170#define DRBD_CONG_EXTENTS_DEF   DRBD_AL_EXTENTS_DEF
 171
 172#undef RANGE
 173#endif
 174
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