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 255
  20#define DRBD_MINOR_COUNT_DEF 32
  21#define DRBD_MINOR_COUNT_SCALE '1'
  22
  23#define DRBD_VOLUME_MAX 65535
  24
  25#define DRBD_DIALOG_REFRESH_MIN 0
  26#define DRBD_DIALOG_REFRESH_MAX 600
  27#define DRBD_DIALOG_REFRESH_SCALE '1'
  28
  29/* valid port number */
  30#define DRBD_PORT_MIN 1
  31#define DRBD_PORT_MAX 0xffff
  32#define DRBD_PORT_SCALE '1'
  33
  34/* startup { */
  35  /* if you want more than 3.4 days, disable */
  36#define DRBD_WFC_TIMEOUT_MIN 0
  37#define DRBD_WFC_TIMEOUT_MAX 300000
  38#define DRBD_WFC_TIMEOUT_DEF 0
  39#define DRBD_WFC_TIMEOUT_SCALE '1'
  40
  41#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
  42#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
  43#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
  44#define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'
  45
  46#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
  47#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
  48#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
  49#define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
  50/* }*/
  51
  52/* net { */
  53  /* timeout, unit centi seconds
  54   * more than one minute timeout is not useful */
  55#define DRBD_TIMEOUT_MIN 1
  56#define DRBD_TIMEOUT_MAX 600
  57#define DRBD_TIMEOUT_DEF 60       /* 6 seconds */
  58#define DRBD_TIMEOUT_SCALE '1'
  59
  60 /* If backing disk takes longer than disk_timeout, mark the disk as failed */
  61#define DRBD_DISK_TIMEOUT_MIN 0    /* 0 = disabled */
  62#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
  63#define DRBD_DISK_TIMEOUT_DEF 0    /* disabled */
  64#define DRBD_DISK_TIMEOUT_SCALE '1'
  65
  66  /* active connection retries when C_WF_CONNECTION */
  67#define DRBD_CONNECT_INT_MIN 1
  68#define DRBD_CONNECT_INT_MAX 120
  69#define DRBD_CONNECT_INT_DEF 10   /* seconds */
  70#define DRBD_CONNECT_INT_SCALE '1'
  71
  72  /* keep-alive probes when idle */
  73#define DRBD_PING_INT_MIN 1
  74#define DRBD_PING_INT_MAX 120
  75#define DRBD_PING_INT_DEF 10
  76#define DRBD_PING_INT_SCALE '1'
  77
  78 /* timeout for the ping packets.*/
  79#define DRBD_PING_TIMEO_MIN  1
  80#define DRBD_PING_TIMEO_MAX  300
  81#define DRBD_PING_TIMEO_DEF  5
  82#define DRBD_PING_TIMEO_SCALE '1'
  83
  84  /* max number of write requests between write barriers */
  85#define DRBD_MAX_EPOCH_SIZE_MIN 1
  86#define DRBD_MAX_EPOCH_SIZE_MAX 20000
  87#define DRBD_MAX_EPOCH_SIZE_DEF 2048
  88#define DRBD_MAX_EPOCH_SIZE_SCALE '1'
  89
  90  /* I don't think that a tcp send buffer of more than 10M is useful */
  91#define DRBD_SNDBUF_SIZE_MIN  0
  92#define DRBD_SNDBUF_SIZE_MAX  (10<<20)
  93#define DRBD_SNDBUF_SIZE_DEF  0
  94#define DRBD_SNDBUF_SIZE_SCALE '1'
  95
  96#define DRBD_RCVBUF_SIZE_MIN  0
  97#define DRBD_RCVBUF_SIZE_MAX  (10<<20)
  98#define DRBD_RCVBUF_SIZE_DEF  0
  99#define DRBD_RCVBUF_SIZE_SCALE '1'
 100
 101  /* @4k PageSize -> 128kB - 512MB */
 102#define DRBD_MAX_BUFFERS_MIN  32
 103#define DRBD_MAX_BUFFERS_MAX  131072
 104#define DRBD_MAX_BUFFERS_DEF  2048
 105#define DRBD_MAX_BUFFERS_SCALE '1'
 106
 107  /* @4k PageSize -> 4kB - 512MB */
 108#define DRBD_UNPLUG_WATERMARK_MIN  1
 109#define DRBD_UNPLUG_WATERMARK_MAX  131072
 110#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
 111#define DRBD_UNPLUG_WATERMARK_SCALE '1'
 112
 113  /* 0 is disabled.
 114   * 200 should be more than enough even for very short timeouts */
 115#define DRBD_KO_COUNT_MIN  0
 116#define DRBD_KO_COUNT_MAX  200
 117#define DRBD_KO_COUNT_DEF  7
 118#define DRBD_KO_COUNT_SCALE '1'
 119/* } */
 120
 121/* syncer { */
 122  /* FIXME allow rate to be zero? */
 123#define DRBD_RESYNC_RATE_MIN 1
 124/* channel bonding 10 GbE, or other hardware */
 125#define DRBD_RESYNC_RATE_MAX (4 << 20)
 126#define DRBD_RESYNC_RATE_DEF 250
 127#define DRBD_RESYNC_RATE_SCALE 'k'  /* kilobytes */
 128
 129  /* less than 7 would hit performance unnecessarily.
 130   * 919 slots context information per transaction,
 131   * 32k activity log, 4k transaction size,
 132   * one transaction in flight:
 133   * 919 * 7 = 6433 */
 134#define DRBD_AL_EXTENTS_MIN  7
 135#define DRBD_AL_EXTENTS_MAX  6433
 136#define DRBD_AL_EXTENTS_DEF  1237
 137#define DRBD_AL_EXTENTS_SCALE '1'
 138
 139#define DRBD_MINOR_NUMBER_MIN  -1
 140#define DRBD_MINOR_NUMBER_MAX  ((1 << 20) - 1)
 141#define DRBD_MINOR_NUMBER_DEF  -1
 142#define DRBD_MINOR_NUMBER_SCALE '1'
 143
 144/* } */
 145
 146/* drbdsetup XY resize -d Z
 147 * you are free to reduce the device size to nothing, if you want to.
 148 * the upper limit with 64bit kernel, enough ram and flexible meta data
 149 * is 1 PiB, currently. */
 150/* DRBD_MAX_SECTORS */
 151#define DRBD_DISK_SIZE_MIN  0
 152#define DRBD_DISK_SIZE_MAX  (1 * (2LLU << 40))
 153#define DRBD_DISK_SIZE_DEF  0 /* = disabled = no user size... */
 154#define DRBD_DISK_SIZE_SCALE 's'  /* sectors */
 155
 156#define DRBD_ON_IO_ERROR_DEF EP_DETACH
 157#define DRBD_FENCING_DEF FP_DONT_CARE
 158#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
 159#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
 160#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
 161#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
 162#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
 163#define DRBD_ON_CONGESTION_DEF OC_BLOCK
 164#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL
 165
 166#define DRBD_MAX_BIO_BVECS_MIN 0
 167#define DRBD_MAX_BIO_BVECS_MAX 128
 168#define DRBD_MAX_BIO_BVECS_DEF 0
 169#define DRBD_MAX_BIO_BVECS_SCALE '1'
 170
 171#define DRBD_C_PLAN_AHEAD_MIN  0
 172#define DRBD_C_PLAN_AHEAD_MAX  300
 173#define DRBD_C_PLAN_AHEAD_DEF  20
 174#define DRBD_C_PLAN_AHEAD_SCALE '1'
 175
 176#define DRBD_C_DELAY_TARGET_MIN 1
 177#define DRBD_C_DELAY_TARGET_MAX 100
 178#define DRBD_C_DELAY_TARGET_DEF 10
 179#define DRBD_C_DELAY_TARGET_SCALE '1'
 180
 181#define DRBD_C_FILL_TARGET_MIN 0
 182#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
 183#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
 184#define DRBD_C_FILL_TARGET_SCALE 's'  /* sectors */
 185
 186#define DRBD_C_MAX_RATE_MIN     250
 187#define DRBD_C_MAX_RATE_MAX     (4 << 20)
 188#define DRBD_C_MAX_RATE_DEF     102400
 189#define DRBD_C_MAX_RATE_SCALE   'k'  /* kilobytes */
 190
 191#define DRBD_C_MIN_RATE_MIN     0
 192#define DRBD_C_MIN_RATE_MAX     (4 << 20)
 193#define DRBD_C_MIN_RATE_DEF     250
 194#define DRBD_C_MIN_RATE_SCALE   'k'  /* kilobytes */
 195
 196#define DRBD_CONG_FILL_MIN      0
 197#define DRBD_CONG_FILL_MAX      (10<<21) /* 10GByte in sectors */
 198#define DRBD_CONG_FILL_DEF      0
 199#define DRBD_CONG_FILL_SCALE    's'  /* sectors */
 200
 201#define DRBD_CONG_EXTENTS_MIN   DRBD_AL_EXTENTS_MIN
 202#define DRBD_CONG_EXTENTS_MAX   DRBD_AL_EXTENTS_MAX
 203#define DRBD_CONG_EXTENTS_DEF   DRBD_AL_EXTENTS_DEF
 204#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE
 205
 206#define DRBD_PROTOCOL_DEF DRBD_PROT_C
 207
 208#define DRBD_DISK_BARRIER_DEF   0
 209#define DRBD_DISK_FLUSHES_DEF   1
 210#define DRBD_DISK_DRAIN_DEF     1
 211#define DRBD_MD_FLUSHES_DEF     1
 212#define DRBD_TCP_CORK_DEF       1
 213#define DRBD_AL_UPDATES_DEF     1
 214
 215#define DRBD_ALLOW_TWO_PRIMARIES_DEF    0
 216#define DRBD_ALWAYS_ASBP_DEF    0
 217#define DRBD_USE_RLE_DEF        1
 218
 219#endif
 220
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