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 /* active connection retries when C_WF_CONNECTION */ 52 #define DRBD_CONNECT_INT_MIN 1 53 #define DRBD_CONNECT_INT_MAX 120 54 #define DRBD_CONNECT_INT_DEF 10 /* seconds */ 55 56 /* keep-alive probes when idle */ 57 #define DRBD_PING_INT_MIN 1 58 #define DRBD_PING_INT_MAX 120 59 #define DRBD_PING_INT_DEF 10 60 61 /* timeout for the ping packets.*/ 62 #define DRBD_PING_TIMEO_MIN 1 63 #define DRBD_PING_TIMEO_MAX 100 64 #define DRBD_PING_TIMEO_DEF 5 65 66 /* max number of write requests between write barriers */ 67 #define DRBD_MAX_EPOCH_SIZE_MIN 1 68 #define DRBD_MAX_EPOCH_SIZE_MAX 20000 69 #define DRBD_MAX_EPOCH_SIZE_DEF 2048 70 71 /* I don't think that a tcp send buffer of more than 10M is useful */ 72 #define DRBD_SNDBUF_SIZE_MIN 0 73 #define DRBD_SNDBUF_SIZE_MAX (10<<20) 74 #define DRBD_SNDBUF_SIZE_DEF 0 75 76 #define DRBD_RCVBUF_SIZE_MIN 0 77 #define DRBD_RCVBUF_SIZE_MAX (10<<20) 78 #define DRBD_RCVBUF_SIZE_DEF 0 79 80 /* @4k PageSize -> 128kB - 512MB */ 81 #define DRBD_MAX_BUFFERS_MIN 32 82 #define DRBD_MAX_BUFFERS_MAX 131072 83 #define DRBD_MAX_BUFFERS_DEF 2048 84 85 /* @4k PageSize -> 4kB - 512MB */ 86 #define DRBD_UNPLUG_WATERMARK_MIN 1 87 #define DRBD_UNPLUG_WATERMARK_MAX 131072 88 #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16) 89 90 /* 0 is disabled. 91 * 200 should be more than enough even for very short timeouts */ 92 #define DRBD_KO_COUNT_MIN 0 93 #define DRBD_KO_COUNT_MAX 200 94 #define DRBD_KO_COUNT_DEF 0 95 /* } */ 96 97 /* syncer { */ 98 /* FIXME allow rate to be zero? */ 99 #define DRBD_RATE_MIN 1 100 /* channel bonding 10 GbE, or other hardware */ 101 #define DRBD_RATE_MAX (4 << 20) 102 #define DRBD_RATE_DEF 250 /* kb/second */ 103 104 /* less than 7 would hit performance unnecessarily. 105 * 3833 is the largest prime that still does fit 106 * into 64 sectors of activity log */ 107 #define DRBD_AL_EXTENTS_MIN 7 108 #define DRBD_AL_EXTENTS_MAX 3833 109 #define DRBD_AL_EXTENTS_DEF 127 110 111 #define DRBD_AFTER_MIN -1 112 #define DRBD_AFTER_MAX 255 113 #define DRBD_AFTER_DEF -1 114 115 /* } */ 116 117 /* drbdsetup XY resize -d Z 118 * you are free to reduce the device size to nothing, if you want to. 119 * the upper limit with 64bit kernel, enough ram and flexible meta data 120 * is 1 PiB, currently. */ 121 /* DRBD_MAX_SECTORS */ 122 #define DRBD_DISK_SIZE_SECT_MIN 0 123 #define DRBD_DISK_SIZE_SECT_MAX (1 * (2LLU << 40)) 124 #define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */ 125 126 #define DRBD_ON_IO_ERROR_DEF EP_PASS_ON 127 #define DRBD_FENCING_DEF FP_DONT_CARE 128 #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT 129 #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT 130 #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT 131 #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT 132 #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR 133 #define DRBD_ON_CONGESTION_DEF OC_BLOCK 134 135 #define DRBD_MAX_BIO_BVECS_MIN 0 136 #define DRBD_MAX_BIO_BVECS_MAX 128 137 #define DRBD_MAX_BIO_BVECS_DEF 0 138 139 #define DRBD_C_PLAN_AHEAD_MIN 0 140 #define DRBD_C_PLAN_AHEAD_MAX 300 141 #define DRBD_C_PLAN_AHEAD_DEF 0 /* RS rate controller disabled by default */ 142 143 #define DRBD_C_DELAY_TARGET_MIN 1 144 #define DRBD_C_DELAY_TARGET_MAX 100 145 #define DRBD_C_DELAY_TARGET_DEF 10 146 147 #define DRBD_C_FILL_TARGET_MIN 0 148 #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */ 149 #define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */ 150 151 #define DRBD_C_MAX_RATE_MIN 250 /* kByte/sec */ 152 #define DRBD_C_MAX_RATE_MAX (4 << 20) 153 #define DRBD_C_MAX_RATE_DEF 102400 154 155 #define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */ 156 #define DRBD_C_MIN_RATE_MAX (4 << 20) 157 #define DRBD_C_MIN_RATE_DEF 4096 158 159 #define DRBD_CONG_FILL_MIN 0 160 #define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */ 161 #define DRBD_CONG_FILL_DEF 0 162 163 #define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN 164 #define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX 165 #define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF 166 167 #undef RANGE 168 #endif 169