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