Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 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) |
Lars Ellenberg | 89e1838 | 2009-09-21 10:46:22 +0200 | [diff] [blame] | 73 | #define DRBD_SNDBUF_SIZE_DEF 0 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 74 | |
| 75 | #define DRBD_RCVBUF_SIZE_MIN 0 |
| 76 | #define DRBD_RCVBUF_SIZE_MAX (10<<20) |
Lars Ellenberg | 89e1838 | 2009-09-21 10:46:22 +0200 | [diff] [blame] | 77 | #define DRBD_RCVBUF_SIZE_DEF 0 |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 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 | |
| 132 | #define DRBD_MAX_BIO_BVECS_MIN 0 |
| 133 | #define DRBD_MAX_BIO_BVECS_MAX 128 |
| 134 | #define DRBD_MAX_BIO_BVECS_DEF 0 |
| 135 | |
| 136 | #undef RANGE |
| 137 | #endif |