drbd_limits.h 7.8 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. drbd_limits.h
  4. This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
  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. #ifndef DRBD_LIMITS_H
  13. #define DRBD_LIMITS_H 1
  14. #define DEBUG_RANGE_CHECK 0
  15. #define DRBD_MINOR_COUNT_MIN 1
  16. #define DRBD_MINOR_COUNT_MAX 255
  17. #define DRBD_MINOR_COUNT_DEF 32
  18. #define DRBD_MINOR_COUNT_SCALE '1'
  19. #define DRBD_VOLUME_MAX 65535
  20. #define DRBD_DIALOG_REFRESH_MIN 0
  21. #define DRBD_DIALOG_REFRESH_MAX 600
  22. #define DRBD_DIALOG_REFRESH_SCALE '1'
  23. /* valid port number */
  24. #define DRBD_PORT_MIN 1
  25. #define DRBD_PORT_MAX 0xffff
  26. #define DRBD_PORT_SCALE '1'
  27. /* startup { */
  28. /* if you want more than 3.4 days, disable */
  29. #define DRBD_WFC_TIMEOUT_MIN 0
  30. #define DRBD_WFC_TIMEOUT_MAX 300000
  31. #define DRBD_WFC_TIMEOUT_DEF 0
  32. #define DRBD_WFC_TIMEOUT_SCALE '1'
  33. #define DRBD_DEGR_WFC_TIMEOUT_MIN 0
  34. #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
  35. #define DRBD_DEGR_WFC_TIMEOUT_DEF 0
  36. #define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'
  37. #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
  38. #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
  39. #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
  40. #define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
  41. /* }*/
  42. /* net { */
  43. /* timeout, unit centi seconds
  44. * more than one minute timeout is not useful */
  45. #define DRBD_TIMEOUT_MIN 1
  46. #define DRBD_TIMEOUT_MAX 600
  47. #define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
  48. #define DRBD_TIMEOUT_SCALE '1'
  49. /* If backing disk takes longer than disk_timeout, mark the disk as failed */
  50. #define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */
  51. #define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
  52. #define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */
  53. #define DRBD_DISK_TIMEOUT_SCALE '1'
  54. /* active connection retries when C_WF_CONNECTION */
  55. #define DRBD_CONNECT_INT_MIN 1
  56. #define DRBD_CONNECT_INT_MAX 120
  57. #define DRBD_CONNECT_INT_DEF 10 /* seconds */
  58. #define DRBD_CONNECT_INT_SCALE '1'
  59. /* keep-alive probes when idle */
  60. #define DRBD_PING_INT_MIN 1
  61. #define DRBD_PING_INT_MAX 120
  62. #define DRBD_PING_INT_DEF 10
  63. #define DRBD_PING_INT_SCALE '1'
  64. /* timeout for the ping packets.*/
  65. #define DRBD_PING_TIMEO_MIN 1
  66. #define DRBD_PING_TIMEO_MAX 300
  67. #define DRBD_PING_TIMEO_DEF 5
  68. #define DRBD_PING_TIMEO_SCALE '1'
  69. /* max number of write requests between write barriers */
  70. #define DRBD_MAX_EPOCH_SIZE_MIN 1
  71. #define DRBD_MAX_EPOCH_SIZE_MAX 20000
  72. #define DRBD_MAX_EPOCH_SIZE_DEF 2048
  73. #define DRBD_MAX_EPOCH_SIZE_SCALE '1'
  74. /* I don't think that a tcp send buffer of more than 10M is useful */
  75. #define DRBD_SNDBUF_SIZE_MIN 0
  76. #define DRBD_SNDBUF_SIZE_MAX (10<<20)
  77. #define DRBD_SNDBUF_SIZE_DEF 0
  78. #define DRBD_SNDBUF_SIZE_SCALE '1'
  79. #define DRBD_RCVBUF_SIZE_MIN 0
  80. #define DRBD_RCVBUF_SIZE_MAX (10<<20)
  81. #define DRBD_RCVBUF_SIZE_DEF 0
  82. #define DRBD_RCVBUF_SIZE_SCALE '1'
  83. /* @4k PageSize -> 128kB - 512MB */
  84. #define DRBD_MAX_BUFFERS_MIN 32
  85. #define DRBD_MAX_BUFFERS_MAX 131072
  86. #define DRBD_MAX_BUFFERS_DEF 2048
  87. #define DRBD_MAX_BUFFERS_SCALE '1'
  88. /* @4k PageSize -> 4kB - 512MB */
  89. #define DRBD_UNPLUG_WATERMARK_MIN 1
  90. #define DRBD_UNPLUG_WATERMARK_MAX 131072
  91. #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
  92. #define DRBD_UNPLUG_WATERMARK_SCALE '1'
  93. /* 0 is disabled.
  94. * 200 should be more than enough even for very short timeouts */
  95. #define DRBD_KO_COUNT_MIN 0
  96. #define DRBD_KO_COUNT_MAX 200
  97. #define DRBD_KO_COUNT_DEF 7
  98. #define DRBD_KO_COUNT_SCALE '1'
  99. /* } */
  100. /* syncer { */
  101. /* FIXME allow rate to be zero? */
  102. #define DRBD_RESYNC_RATE_MIN 1
  103. /* channel bonding 10 GbE, or other hardware */
  104. #define DRBD_RESYNC_RATE_MAX (4 << 20)
  105. #define DRBD_RESYNC_RATE_DEF 250
  106. #define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */
  107. #define DRBD_AL_EXTENTS_MIN 67
  108. /* we use u16 as "slot number", (u16)~0 is "FREE".
  109. * If you use >= 292 kB on-disk ring buffer,
  110. * this is the maximum you can use: */
  111. #define DRBD_AL_EXTENTS_MAX 0xfffe
  112. #define DRBD_AL_EXTENTS_DEF 1237
  113. #define DRBD_AL_EXTENTS_SCALE '1'
  114. #define DRBD_MINOR_NUMBER_MIN -1
  115. #define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1)
  116. #define DRBD_MINOR_NUMBER_DEF -1
  117. #define DRBD_MINOR_NUMBER_SCALE '1'
  118. /* } */
  119. /* drbdsetup XY resize -d Z
  120. * you are free to reduce the device size to nothing, if you want to.
  121. * the upper limit with 64bit kernel, enough ram and flexible meta data
  122. * is 1 PiB, currently. */
  123. /* DRBD_MAX_SECTORS */
  124. #define DRBD_DISK_SIZE_MIN 0
  125. #define DRBD_DISK_SIZE_MAX (1 * (2LLU << 40))
  126. #define DRBD_DISK_SIZE_DEF 0 /* = disabled = no user size... */
  127. #define DRBD_DISK_SIZE_SCALE 's' /* sectors */
  128. #define DRBD_ON_IO_ERROR_DEF EP_DETACH
  129. #define DRBD_FENCING_DEF FP_DONT_CARE
  130. #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
  131. #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
  132. #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
  133. #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
  134. #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
  135. #define DRBD_ON_CONGESTION_DEF OC_BLOCK
  136. #define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL
  137. #define DRBD_MAX_BIO_BVECS_MIN 0
  138. #define DRBD_MAX_BIO_BVECS_MAX 128
  139. #define DRBD_MAX_BIO_BVECS_DEF 0
  140. #define DRBD_MAX_BIO_BVECS_SCALE '1'
  141. #define DRBD_C_PLAN_AHEAD_MIN 0
  142. #define DRBD_C_PLAN_AHEAD_MAX 300
  143. #define DRBD_C_PLAN_AHEAD_DEF 20
  144. #define DRBD_C_PLAN_AHEAD_SCALE '1'
  145. #define DRBD_C_DELAY_TARGET_MIN 1
  146. #define DRBD_C_DELAY_TARGET_MAX 100
  147. #define DRBD_C_DELAY_TARGET_DEF 10
  148. #define DRBD_C_DELAY_TARGET_SCALE '1'
  149. #define DRBD_C_FILL_TARGET_MIN 0
  150. #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
  151. #define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
  152. #define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */
  153. #define DRBD_C_MAX_RATE_MIN 250
  154. #define DRBD_C_MAX_RATE_MAX (4 << 20)
  155. #define DRBD_C_MAX_RATE_DEF 102400
  156. #define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */
  157. #define DRBD_C_MIN_RATE_MIN 0
  158. #define DRBD_C_MIN_RATE_MAX (4 << 20)
  159. #define DRBD_C_MIN_RATE_DEF 250
  160. #define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */
  161. #define DRBD_CONG_FILL_MIN 0
  162. #define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
  163. #define DRBD_CONG_FILL_DEF 0
  164. #define DRBD_CONG_FILL_SCALE 's' /* sectors */
  165. #define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN
  166. #define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX
  167. #define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF
  168. #define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE
  169. #define DRBD_PROTOCOL_DEF DRBD_PROT_C
  170. #define DRBD_DISK_BARRIER_DEF 0
  171. #define DRBD_DISK_FLUSHES_DEF 1
  172. #define DRBD_DISK_DRAIN_DEF 1
  173. #define DRBD_MD_FLUSHES_DEF 1
  174. #define DRBD_TCP_CORK_DEF 1
  175. #define DRBD_AL_UPDATES_DEF 1
  176. /* We used to ignore the discard_zeroes_data setting.
  177. * To not change established (and expected) behaviour,
  178. * by default assume that, for discard_zeroes_data=0,
  179. * we can make that an effective discard_zeroes_data=1,
  180. * if we only explicitly zero-out unaligned partial chunks. */
  181. #define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1
  182. /* Some backends pretend to support WRITE SAME,
  183. * but fail such requests when they are actually submitted.
  184. * This is to tell DRBD to not even try. */
  185. #define DRBD_DISABLE_WRITE_SAME_DEF 0
  186. #define DRBD_ALLOW_TWO_PRIMARIES_DEF 0
  187. #define DRBD_ALWAYS_ASBP_DEF 0
  188. #define DRBD_USE_RLE_DEF 1
  189. #define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0
  190. #define DRBD_AL_STRIPES_MIN 1
  191. #define DRBD_AL_STRIPES_MAX 1024
  192. #define DRBD_AL_STRIPES_DEF 1
  193. #define DRBD_AL_STRIPES_SCALE '1'
  194. #define DRBD_AL_STRIPE_SIZE_MIN 4
  195. #define DRBD_AL_STRIPE_SIZE_MAX 16777216
  196. #define DRBD_AL_STRIPE_SIZE_DEF 32
  197. #define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */
  198. #define DRBD_SOCKET_CHECK_TIMEO_MIN 0
  199. #define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
  200. #define DRBD_SOCKET_CHECK_TIMEO_DEF 0
  201. #define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'
  202. #define DRBD_RS_DISCARD_GRANULARITY_MIN 0
  203. #define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */
  204. #define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */
  205. #define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */
  206. #endif