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Philipp Reisnerb411b362009-09-25 16:07:19 -07001/*
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
Philipp Reisnerb80c0432011-07-18 11:09:17 +020019#define DRBD_MINOR_COUNT_MAX 255
Philipp Reisner2b8a90b2011-01-10 11:15:17 +010020#define DRBD_MINOR_COUNT_DEF 32
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020021#define DRBD_MINOR_COUNT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070022
Andreas Gruenbacher0c8e36d2011-03-30 16:00:17 +020023#define DRBD_VOLUME_MAX 65535
24
Philipp Reisnerb411b362009-09-25 16:07:19 -070025#define DRBD_DIALOG_REFRESH_MIN 0
26#define DRBD_DIALOG_REFRESH_MAX 600
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020027#define DRBD_DIALOG_REFRESH_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070028
29/* valid port number */
30#define DRBD_PORT_MIN 1
31#define DRBD_PORT_MAX 0xffff
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020032#define DRBD_PORT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070033
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
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020039#define DRBD_WFC_TIMEOUT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070040
41#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
42#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
43#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020044#define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070045
46#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
47#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
48#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020049#define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070050/* }*/
51
52/* net { */
53 /* timeout, unit centi seconds
Lucas De Marchi25985ed2011-03-30 22:57:33 -030054 * more than one minute timeout is not useful */
Philipp Reisnerb411b362009-09-25 16:07:19 -070055#define DRBD_TIMEOUT_MIN 1
56#define DRBD_TIMEOUT_MAX 600
57#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020058#define DRBD_TIMEOUT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070059
Philipp Reisnercdfda632011-07-05 15:38:59 +020060 /* 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
Philipp Reisnerb411b362009-09-25 16:07:19 -070066 /* 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 */
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020070#define DRBD_CONNECT_INT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070071
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
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020076#define DRBD_PING_INT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070077
78 /* timeout for the ping packets.*/
79#define DRBD_PING_TIMEO_MIN 1
Lars Ellenbergf03c2542011-06-20 22:21:19 +020080#define DRBD_PING_TIMEO_MAX 300
Philipp Reisnerb411b362009-09-25 16:07:19 -070081#define DRBD_PING_TIMEO_DEF 5
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020082#define DRBD_PING_TIMEO_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070083
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
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020088#define DRBD_MAX_EPOCH_SIZE_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070089
Lucas De Marchi25985ed2011-03-30 22:57:33 -030090 /* I don't think that a tcp send buffer of more than 10M is useful */
Philipp Reisnerb411b362009-09-25 16:07:19 -070091#define DRBD_SNDBUF_SIZE_MIN 0
92#define DRBD_SNDBUF_SIZE_MAX (10<<20)
Lars Ellenberg89e18382009-09-21 10:46:22 +020093#define DRBD_SNDBUF_SIZE_DEF 0
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020094#define DRBD_SNDBUF_SIZE_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -070095
96#define DRBD_RCVBUF_SIZE_MIN 0
97#define DRBD_RCVBUF_SIZE_MAX (10<<20)
Lars Ellenberg89e18382009-09-21 10:46:22 +020098#define DRBD_RCVBUF_SIZE_DEF 0
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +020099#define DRBD_RCVBUF_SIZE_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700100
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
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200105#define DRBD_MAX_BUFFERS_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700106
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)
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200111#define DRBD_UNPLUG_WATERMARK_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700112
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
Philipp Reisner65d94922011-07-13 10:24:51 +0200117#define DRBD_KO_COUNT_DEF 7
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200118#define DRBD_KO_COUNT_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700119/* } */
120
121/* syncer { */
122 /* FIXME allow rate to be zero? */
Andreas Gruenbacher6394b932011-05-11 14:29:52 +0200123#define DRBD_RESYNC_RATE_MIN 1
Philipp Reisnerb411b362009-09-25 16:07:19 -0700124/* channel bonding 10 GbE, or other hardware */
Andreas Gruenbacher6394b932011-05-11 14:29:52 +0200125#define DRBD_RESYNC_RATE_MAX (4 << 20)
126#define DRBD_RESYNC_RATE_DEF 250
127#define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */
Philipp Reisnerb411b362009-09-25 16:07:19 -0700128
Lars Ellenberg5bbcf5e2013-03-19 18:16:59 +0100129 /* less than 7 would hit performance unnecessarily. */
Philipp Reisnerb411b362009-09-25 16:07:19 -0700130#define DRBD_AL_EXTENTS_MIN 7
Lars Ellenberg5bbcf5e2013-03-19 18:16:59 +0100131 /* 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
Philipp Reisner65d94922011-07-13 10:24:51 +0200135#define DRBD_AL_EXTENTS_DEF 1237
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200136#define DRBD_AL_EXTENTS_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700137
Andreas Gruenbacher309f0b72011-05-13 01:24:14 +0200138#define DRBD_MINOR_NUMBER_MIN -1
Andreas Gruenbacher0317d9e2011-07-13 13:40:30 +0200139#define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1)
Andreas Gruenbacher309f0b72011-05-13 01:24:14 +0200140#define DRBD_MINOR_NUMBER_DEF -1
141#define DRBD_MINOR_NUMBER_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700142
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
Lars Ellenberg15b493d2011-06-28 09:48:48 +0200148 * is 1 PiB, currently. */
Philipp Reisnerb411b362009-09-25 16:07:19 -0700149/* DRBD_MAX_SECTORS */
Andreas Gruenbacherc5482bb2011-05-11 14:44:55 +0200150#define DRBD_DISK_SIZE_MIN 0
Philipp Reisnerd942ae42011-05-31 13:07:24 +0200151#define DRBD_DISK_SIZE_MAX (1 * (2LLU << 40))
Andreas Gruenbacherc5482bb2011-05-11 14:44:55 +0200152#define DRBD_DISK_SIZE_DEF 0 /* = disabled = no user size... */
153#define DRBD_DISK_SIZE_SCALE 's' /* sectors */
Philipp Reisnerb411b362009-09-25 16:07:19 -0700154
Lars Ellenberga5df0e12011-02-23 12:51:43 +0100155#define DRBD_ON_IO_ERROR_DEF EP_DETACH
Philipp Reisnerb411b362009-09-25 16:07:19 -0700156#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
Philipp Reisner265be2d2010-05-31 10:14:17 +0200161#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
Philipp Reisner422028b2010-10-27 11:12:07 +0200162#define DRBD_ON_CONGESTION_DEF OC_BLOCK
Philipp Reisner380207d2011-11-11 12:31:20 +0100163#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL
Philipp Reisnerb411b362009-09-25 16:07:19 -0700164
165#define DRBD_MAX_BIO_BVECS_MIN 0
166#define DRBD_MAX_BIO_BVECS_MAX 128
167#define DRBD_MAX_BIO_BVECS_DEF 0
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200168#define DRBD_MAX_BIO_BVECS_SCALE '1'
Philipp Reisnerb411b362009-09-25 16:07:19 -0700169
Philipp Reisner9a31d712010-07-05 13:42:03 +0200170#define DRBD_C_PLAN_AHEAD_MIN 0
171#define DRBD_C_PLAN_AHEAD_MAX 300
Philipp Reisner65d94922011-07-13 10:24:51 +0200172#define DRBD_C_PLAN_AHEAD_DEF 20
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200173#define DRBD_C_PLAN_AHEAD_SCALE '1'
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200174
Philipp Reisner9a31d712010-07-05 13:42:03 +0200175#define DRBD_C_DELAY_TARGET_MIN 1
176#define DRBD_C_DELAY_TARGET_MAX 100
177#define DRBD_C_DELAY_TARGET_DEF 10
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200178#define DRBD_C_DELAY_TARGET_SCALE '1'
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200179
Philipp Reisner9a31d712010-07-05 13:42:03 +0200180#define DRBD_C_FILL_TARGET_MIN 0
Philipp Reisner00b42532010-10-05 11:19:39 +0200181#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
Philipp Reisner65d94922011-07-13 10:24:51 +0200182#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200183#define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200184
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200185#define DRBD_C_MAX_RATE_MIN 250
Philipp Reisner9a31d712010-07-05 13:42:03 +0200186#define DRBD_C_MAX_RATE_MAX (4 << 20)
187#define DRBD_C_MAX_RATE_DEF 102400
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200188#define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200189
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200190#define DRBD_C_MIN_RATE_MIN 0
Lars Ellenberg0f0601f2010-08-11 23:40:24 +0200191#define DRBD_C_MIN_RATE_MAX (4 << 20)
Philipp Reisner65d94922011-07-13 10:24:51 +0200192#define DRBD_C_MIN_RATE_DEF 250
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200193#define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */
Lars Ellenberg0f0601f2010-08-11 23:40:24 +0200194
Philipp Reisner422028b2010-10-27 11:12:07 +0200195#define DRBD_CONG_FILL_MIN 0
196#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
197#define DRBD_CONG_FILL_DEF 0
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200198#define DRBD_CONG_FILL_SCALE 's' /* sectors */
Philipp Reisner422028b2010-10-27 11:12:07 +0200199
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
Andreas Gruenbacher32bdb642011-05-09 18:26:20 +0200203#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE
Philipp Reisner422028b2010-10-27 11:12:07 +0200204
Lars Ellenbergf3990022011-03-23 14:31:09 +0100205#define DRBD_PROTOCOL_DEF DRBD_PROT_C
206
Andreas Gruenbacher7bac3e62011-05-06 17:50:57 +0200207#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
Philipp Reisner9a51ab12012-02-20 21:53:28 +0100212#define DRBD_AL_UPDATES_DEF 1
Lars Ellenbergdd4f6992016-06-14 00:26:20 +0200213/* We used to ignore the discard_zeroes_data setting.
214 * To not change established (and expected) behaviour,
215 * by default assume that, for discard_zeroes_data=0,
216 * we can make that an effective discard_zeroes_data=1,
217 * if we only explicitly zero-out unaligned partial chunks. */
218#define DRBD_DISCARD_ZEROES_IF_ALIGNED 1
Andreas Gruenbacher7bac3e62011-05-06 17:50:57 +0200219
220#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0
221#define DRBD_ALWAYS_ASBP_DEF 0
Philipp Reisner65d94922011-07-13 10:24:51 +0200222#define DRBD_USE_RLE_DEF 1
Lars Ellenbergaaaba342014-03-18 12:30:09 +0100223#define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0
Andreas Gruenbacher7bac3e62011-05-06 17:50:57 +0200224
Philipp Reisnerd752b262013-06-25 16:50:08 +0200225#define DRBD_AL_STRIPES_MIN 1
226#define DRBD_AL_STRIPES_MAX 1024
227#define DRBD_AL_STRIPES_DEF 1
228#define DRBD_AL_STRIPES_SCALE '1'
229
230#define DRBD_AL_STRIPE_SIZE_MIN 4
231#define DRBD_AL_STRIPE_SIZE_MAX 16777216
232#define DRBD_AL_STRIPE_SIZE_DEF 32
233#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */
Philipp Reisner5d0b17f2014-03-18 14:24:35 +0100234
235#define DRBD_SOCKET_CHECK_TIMEO_MIN 0
236#define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
237#define DRBD_SOCKET_CHECK_TIMEO_DEF 0
238#define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'
Philipp Reisnera5ca66c2016-06-14 00:26:14 +0200239
240#define DRBD_RS_DISCARD_GRANULARITY_MIN 0
241#define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */
242#define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */
243#define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */
244
Philipp Reisnerb411b362009-09-25 16:07:19 -0700245#endif