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#define DRBD_AL_EXTENTS_MIN 7 131 /* we use u16 as "slot number", (u16)~0 is "FREE". 132 * If you use >= 292 kB on-disk ring buffer, 133 * this is the maximum you can use: */ 134#define DRBD_AL_EXTENTS_MAX 0xfffe 135#define DRBD_AL_EXTENTS_DEF 1237 136#define DRBD_AL_EXTENTS_SCALE '1' 137 138#define DRBD_MINOR_NUMBER_MIN -1 139#define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1) 140#define DRBD_MINOR_NUMBER_DEF -1 141#define DRBD_MINOR_NUMBER_SCALE '1' 142 143/* } */ 144 145/* drbdsetup XY resize -d Z 146 * you are free to reduce the device size to nothing, if you want to. 147 * the upper limit with 64bit kernel, enough ram and flexible meta data 148 * is 1 PiB, currently. */ 149/* DRBD_MAX_SECTORS */ 150#define DRBD_DISK_SIZE_MIN 0 151#define DRBD_DISK_SIZE_MAX (1 * (2LLU << 40)) 152#define DRBD_DISK_SIZE_DEF 0 /* = disabled = no user size... */ 153#define DRBD_DISK_SIZE_SCALE 's' /* sectors */ 154 155#define DRBD_ON_IO_ERROR_DEF EP_DETACH 156#define DRBD_FENCING_DEF FP_DONT_CARE 157#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT 158#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT 159#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT 160#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT 161#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR 162#define DRBD_ON_CONGESTION_DEF OC_BLOCK 163#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL 164 165#define DRBD_MAX_BIO_BVECS_MIN 0 166#define DRBD_MAX_BIO_BVECS_MAX 128 167#define DRBD_MAX_BIO_BVECS_DEF 0 168#define DRBD_MAX_BIO_BVECS_SCALE '1' 169 170#define DRBD_C_PLAN_AHEAD_MIN 0 171#define DRBD_C_PLAN_AHEAD_MAX 300 172#define DRBD_C_PLAN_AHEAD_DEF 20 173#define DRBD_C_PLAN_AHEAD_SCALE '1' 174 175#define DRBD_C_DELAY_TARGET_MIN 1 176#define DRBD_C_DELAY_TARGET_MAX 100 177#define DRBD_C_DELAY_TARGET_DEF 10 178#define DRBD_C_DELAY_TARGET_SCALE '1' 179 180#define DRBD_C_FILL_TARGET_MIN 0 181#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */ 182#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */ 183#define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */ 184 185#define DRBD_C_MAX_RATE_MIN 250 186#define DRBD_C_MAX_RATE_MAX (4 << 20) 187#define DRBD_C_MAX_RATE_DEF 102400 188#define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */ 189 190#define DRBD_C_MIN_RATE_MIN 0 191#define DRBD_C_MIN_RATE_MAX (4 << 20) 192#define DRBD_C_MIN_RATE_DEF 250 193#define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */ 194 195#define DRBD_CONG_FILL_MIN 0 196#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */ 197#define DRBD_CONG_FILL_DEF 0 198#define DRBD_CONG_FILL_SCALE 's' /* sectors */ 199 200#define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN 201#define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX 202#define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF 203#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE 204 205#define DRBD_PROTOCOL_DEF DRBD_PROT_C 206 207#define DRBD_DISK_BARRIER_DEF 0 208#define DRBD_DISK_FLUSHES_DEF 1 209#define DRBD_DISK_DRAIN_DEF 1 210#define DRBD_MD_FLUSHES_DEF 1 211#define DRBD_TCP_CORK_DEF 1 212#define DRBD_AL_UPDATES_DEF 1 213 214#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0 215#define DRBD_ALWAYS_ASBP_DEF 0 216#define DRBD_USE_RLE_DEF 1 217#define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0 218 219#define DRBD_AL_STRIPES_MIN 1 220#define DRBD_AL_STRIPES_MAX 1024 221#define DRBD_AL_STRIPES_DEF 1 222#define DRBD_AL_STRIPES_SCALE '1' 223 224#define DRBD_AL_STRIPE_SIZE_MIN 4 225#define DRBD_AL_STRIPE_SIZE_MAX 16777216 226#define DRBD_AL_STRIPE_SIZE_DEF 32 227#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */ 228 229#define DRBD_SOCKET_CHECK_TIMEO_MIN 0 230#define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX 231#define DRBD_SOCKET_CHECK_TIMEO_DEF 0 232#define DRBD_SOCKET_CHECK_TIMEO_SCALE '1' 233#endif 234