Commit | Line | Data |
---|---|---|
37800068 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
b411b363 PR |
2 | /* |
3 | drbd_limits.h | |
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | */ | |
6 | ||
7 | /* | |
8 | * Our current limitations. | |
9 | * Some of them are hard limits, | |
10 | * some of them are arbitrary range limits, that make it easier to provide | |
11 | * feedback about nonsense settings for certain configurable values. | |
12 | */ | |
13 | ||
14 | #ifndef DRBD_LIMITS_H | |
15 | #define DRBD_LIMITS_H 1 | |
16 | ||
17 | #define DEBUG_RANGE_CHECK 0 | |
18 | ||
c10bdcf9 CB |
19 | #define DRBD_MINOR_COUNT_MIN 1U |
20 | #define DRBD_MINOR_COUNT_MAX 255U | |
21 | #define DRBD_MINOR_COUNT_DEF 32U | |
32bdb640 | 22 | #define DRBD_MINOR_COUNT_SCALE '1' |
b411b363 | 23 | |
c10bdcf9 | 24 | #define DRBD_VOLUME_MAX 65534U |
0c8e36d9 | 25 | |
c10bdcf9 CB |
26 | #define DRBD_DIALOG_REFRESH_MIN 0U |
27 | #define DRBD_DIALOG_REFRESH_MAX 600U | |
32bdb640 | 28 | #define DRBD_DIALOG_REFRESH_SCALE '1' |
b411b363 PR |
29 | |
30 | /* valid port number */ | |
c10bdcf9 CB |
31 | #define DRBD_PORT_MIN 1U |
32 | #define DRBD_PORT_MAX 0xffffU | |
32bdb640 | 33 | #define DRBD_PORT_SCALE '1' |
b411b363 PR |
34 | |
35 | /* startup { */ | |
36 | /* if you want more than 3.4 days, disable */ | |
c10bdcf9 CB |
37 | #define DRBD_WFC_TIMEOUT_MIN 0U |
38 | #define DRBD_WFC_TIMEOUT_MAX 300000U | |
39 | #define DRBD_WFC_TIMEOUT_DEF 0U | |
32bdb640 | 40 | #define DRBD_WFC_TIMEOUT_SCALE '1' |
b411b363 | 41 | |
c10bdcf9 CB |
42 | #define DRBD_DEGR_WFC_TIMEOUT_MIN 0U |
43 | #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000U | |
44 | #define DRBD_DEGR_WFC_TIMEOUT_DEF 0U | |
32bdb640 | 45 | #define DRBD_DEGR_WFC_TIMEOUT_SCALE '1' |
b411b363 | 46 | |
c10bdcf9 CB |
47 | #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0U |
48 | #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000U | |
49 | #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0U | |
32bdb640 | 50 | #define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1' |
b411b363 PR |
51 | /* }*/ |
52 | ||
53 | /* net { */ | |
54 | /* timeout, unit centi seconds | |
25985edc | 55 | * more than one minute timeout is not useful */ |
c10bdcf9 CB |
56 | #define DRBD_TIMEOUT_MIN 1U |
57 | #define DRBD_TIMEOUT_MAX 600U | |
58 | #define DRBD_TIMEOUT_DEF 60U /* 6 seconds */ | |
32bdb640 | 59 | #define DRBD_TIMEOUT_SCALE '1' |
b411b363 | 60 | |
cdfda633 | 61 | /* If backing disk takes longer than disk_timeout, mark the disk as failed */ |
c10bdcf9 CB |
62 | #define DRBD_DISK_TIMEOUT_MIN 0U /* 0 = disabled */ |
63 | #define DRBD_DISK_TIMEOUT_MAX 6000U /* 10 Minutes */ | |
64 | #define DRBD_DISK_TIMEOUT_DEF 0U /* disabled */ | |
cdfda633 PR |
65 | #define DRBD_DISK_TIMEOUT_SCALE '1' |
66 | ||
b411b363 | 67 | /* active connection retries when C_WF_CONNECTION */ |
c10bdcf9 CB |
68 | #define DRBD_CONNECT_INT_MIN 1U |
69 | #define DRBD_CONNECT_INT_MAX 120U | |
70 | #define DRBD_CONNECT_INT_DEF 10U /* seconds */ | |
32bdb640 | 71 | #define DRBD_CONNECT_INT_SCALE '1' |
b411b363 PR |
72 | |
73 | /* keep-alive probes when idle */ | |
c10bdcf9 CB |
74 | #define DRBD_PING_INT_MIN 1U |
75 | #define DRBD_PING_INT_MAX 120U | |
76 | #define DRBD_PING_INT_DEF 10U | |
32bdb640 | 77 | #define DRBD_PING_INT_SCALE '1' |
b411b363 PR |
78 | |
79 | /* timeout for the ping packets.*/ | |
c10bdcf9 CB |
80 | #define DRBD_PING_TIMEO_MIN 1U |
81 | #define DRBD_PING_TIMEO_MAX 300U | |
82 | #define DRBD_PING_TIMEO_DEF 5U | |
32bdb640 | 83 | #define DRBD_PING_TIMEO_SCALE '1' |
b411b363 PR |
84 | |
85 | /* max number of write requests between write barriers */ | |
c10bdcf9 CB |
86 | #define DRBD_MAX_EPOCH_SIZE_MIN 1U |
87 | #define DRBD_MAX_EPOCH_SIZE_MAX 20000U | |
88 | #define DRBD_MAX_EPOCH_SIZE_DEF 2048U | |
32bdb640 | 89 | #define DRBD_MAX_EPOCH_SIZE_SCALE '1' |
b411b363 | 90 | |
25985edc | 91 | /* I don't think that a tcp send buffer of more than 10M is useful */ |
c10bdcf9 CB |
92 | #define DRBD_SNDBUF_SIZE_MIN 0U |
93 | #define DRBD_SNDBUF_SIZE_MAX (10U<<20) | |
94 | #define DRBD_SNDBUF_SIZE_DEF 0U | |
32bdb640 | 95 | #define DRBD_SNDBUF_SIZE_SCALE '1' |
b411b363 | 96 | |
c10bdcf9 CB |
97 | #define DRBD_RCVBUF_SIZE_MIN 0U |
98 | #define DRBD_RCVBUF_SIZE_MAX (10U<<20) | |
99 | #define DRBD_RCVBUF_SIZE_DEF 0U | |
32bdb640 | 100 | #define DRBD_RCVBUF_SIZE_SCALE '1' |
b411b363 PR |
101 | |
102 | /* @4k PageSize -> 128kB - 512MB */ | |
c10bdcf9 CB |
103 | #define DRBD_MAX_BUFFERS_MIN 32U |
104 | #define DRBD_MAX_BUFFERS_MAX 131072U | |
105 | #define DRBD_MAX_BUFFERS_DEF 2048U | |
32bdb640 | 106 | #define DRBD_MAX_BUFFERS_SCALE '1' |
b411b363 PR |
107 | |
108 | /* @4k PageSize -> 4kB - 512MB */ | |
c10bdcf9 CB |
109 | #define DRBD_UNPLUG_WATERMARK_MIN 1U |
110 | #define DRBD_UNPLUG_WATERMARK_MAX 131072U | |
b411b363 | 111 | #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16) |
32bdb640 | 112 | #define DRBD_UNPLUG_WATERMARK_SCALE '1' |
b411b363 PR |
113 | |
114 | /* 0 is disabled. | |
115 | * 200 should be more than enough even for very short timeouts */ | |
c10bdcf9 CB |
116 | #define DRBD_KO_COUNT_MIN 0U |
117 | #define DRBD_KO_COUNT_MAX 200U | |
118 | #define DRBD_KO_COUNT_DEF 7U | |
32bdb640 | 119 | #define DRBD_KO_COUNT_SCALE '1' |
b411b363 PR |
120 | /* } */ |
121 | ||
122 | /* syncer { */ | |
123 | /* FIXME allow rate to be zero? */ | |
c10bdcf9 | 124 | #define DRBD_RESYNC_RATE_MIN 1U |
b411b363 | 125 | /* channel bonding 10 GbE, or other hardware */ |
6394b935 | 126 | #define DRBD_RESYNC_RATE_MAX (4 << 20) |
c10bdcf9 | 127 | #define DRBD_RESYNC_RATE_DEF 250U |
6394b935 | 128 | #define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */ |
b411b363 | 129 | |
c10bdcf9 | 130 | #define DRBD_AL_EXTENTS_MIN 67U |
5bbcf5e6 LE |
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: */ | |
c10bdcf9 CB |
134 | #define DRBD_AL_EXTENTS_MAX 0xfffeU |
135 | #define DRBD_AL_EXTENTS_DEF 1237U | |
32bdb640 | 136 | #define DRBD_AL_EXTENTS_SCALE '1' |
b411b363 | 137 | |
309f0b70 | 138 | #define DRBD_MINOR_NUMBER_MIN -1 |
0317d9ec | 139 | #define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1) |
309f0b70 AG |
140 | #define DRBD_MINOR_NUMBER_DEF -1 |
141 | #define DRBD_MINOR_NUMBER_SCALE '1' | |
b411b363 PR |
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 | |
15b493d1 | 148 | * is 1 PiB, currently. */ |
b411b363 | 149 | /* DRBD_MAX_SECTORS */ |
c10bdcf9 CB |
150 | #define DRBD_DISK_SIZE_MIN 0LLU |
151 | #define DRBD_DISK_SIZE_MAX (1LLU * (2LLU << 40)) | |
152 | #define DRBD_DISK_SIZE_DEF 0LLU /* = disabled = no user size... */ | |
c5482bbd | 153 | #define DRBD_DISK_SIZE_SCALE 's' /* sectors */ |
b411b363 | 154 | |
a5df0e19 | 155 | #define DRBD_ON_IO_ERROR_DEF EP_DETACH |
b411b363 PR |
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 | |
265be2d0 | 161 | #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR |
422028b1 | 162 | #define DRBD_ON_CONGESTION_DEF OC_BLOCK |
380207d0 | 163 | #define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL |
b411b363 | 164 | |
c10bdcf9 CB |
165 | #define DRBD_MAX_BIO_BVECS_MIN 0U |
166 | #define DRBD_MAX_BIO_BVECS_MAX 128U | |
167 | #define DRBD_MAX_BIO_BVECS_DEF 0U | |
32bdb640 | 168 | #define DRBD_MAX_BIO_BVECS_SCALE '1' |
b411b363 | 169 | |
c10bdcf9 CB |
170 | #define DRBD_C_PLAN_AHEAD_MIN 0U |
171 | #define DRBD_C_PLAN_AHEAD_MAX 300U | |
172 | #define DRBD_C_PLAN_AHEAD_DEF 20U | |
32bdb640 | 173 | #define DRBD_C_PLAN_AHEAD_SCALE '1' |
67c7ddd0 | 174 | |
c10bdcf9 CB |
175 | #define DRBD_C_DELAY_TARGET_MIN 1U |
176 | #define DRBD_C_DELAY_TARGET_MAX 100U | |
177 | #define DRBD_C_DELAY_TARGET_DEF 10U | |
32bdb640 | 178 | #define DRBD_C_DELAY_TARGET_SCALE '1' |
67c7ddd0 | 179 | |
c10bdcf9 CB |
180 | #define DRBD_C_FILL_TARGET_MIN 0U |
181 | #define DRBD_C_FILL_TARGET_MAX (1U<<20) /* 500MByte in sec */ | |
182 | #define DRBD_C_FILL_TARGET_DEF 100U /* Try to place 50KiB in socket send buffer during resync */ | |
32bdb640 | 183 | #define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */ |
67c7ddd0 | 184 | |
c10bdcf9 CB |
185 | #define DRBD_C_MAX_RATE_MIN 250U |
186 | #define DRBD_C_MAX_RATE_MAX (4U << 20) | |
187 | #define DRBD_C_MAX_RATE_DEF 102400U | |
32bdb640 | 188 | #define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */ |
67c7ddd0 | 189 | |
c10bdcf9 CB |
190 | #define DRBD_C_MIN_RATE_MIN 0U |
191 | #define DRBD_C_MIN_RATE_MAX (4U << 20) | |
192 | #define DRBD_C_MIN_RATE_DEF 250U | |
32bdb640 | 193 | #define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */ |
0f0601f4 | 194 | |
c10bdcf9 CB |
195 | #define DRBD_CONG_FILL_MIN 0U |
196 | #define DRBD_CONG_FILL_MAX (10U<<21) /* 10GByte in sectors */ | |
197 | #define DRBD_CONG_FILL_DEF 0U | |
32bdb640 | 198 | #define DRBD_CONG_FILL_SCALE 's' /* sectors */ |
422028b1 PR |
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 | |
32bdb640 | 203 | #define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE |
422028b1 | 204 | |
f399002e LE |
205 | #define DRBD_PROTOCOL_DEF DRBD_PROT_C |
206 | ||
c10bdcf9 CB |
207 | #define DRBD_DISK_BARRIER_DEF 0U |
208 | #define DRBD_DISK_FLUSHES_DEF 1U | |
209 | #define DRBD_DISK_DRAIN_DEF 1U | |
210 | #define DRBD_MD_FLUSHES_DEF 1U | |
211 | #define DRBD_TCP_CORK_DEF 1U | |
212 | #define DRBD_AL_UPDATES_DEF 1U | |
9de7e14a | 213 | |
dd4f699d LE |
214 | /* We used to ignore the discard_zeroes_data setting. |
215 | * To not change established (and expected) behaviour, | |
216 | * by default assume that, for discard_zeroes_data=0, | |
217 | * we can make that an effective discard_zeroes_data=1, | |
218 | * if we only explicitly zero-out unaligned partial chunks. */ | |
c10bdcf9 | 219 | #define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1U |
9de7e14a LE |
220 | |
221 | /* Some backends pretend to support WRITE SAME, | |
222 | * but fail such requests when they are actually submitted. | |
223 | * This is to tell DRBD to not even try. */ | |
c10bdcf9 | 224 | #define DRBD_DISABLE_WRITE_SAME_DEF 0U |
7bac3e6f | 225 | |
c10bdcf9 CB |
226 | #define DRBD_ALLOW_TWO_PRIMARIES_DEF 0U |
227 | #define DRBD_ALWAYS_ASBP_DEF 0U | |
228 | #define DRBD_USE_RLE_DEF 1U | |
229 | #define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0U | |
7bac3e6f | 230 | |
c10bdcf9 CB |
231 | #define DRBD_AL_STRIPES_MIN 1U |
232 | #define DRBD_AL_STRIPES_MAX 1024U | |
233 | #define DRBD_AL_STRIPES_DEF 1U | |
d752b269 PR |
234 | #define DRBD_AL_STRIPES_SCALE '1' |
235 | ||
c10bdcf9 CB |
236 | #define DRBD_AL_STRIPE_SIZE_MIN 4U |
237 | #define DRBD_AL_STRIPE_SIZE_MAX 16777216U | |
238 | #define DRBD_AL_STRIPE_SIZE_DEF 32U | |
d752b269 | 239 | #define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */ |
5d0b17f1 | 240 | |
c10bdcf9 | 241 | #define DRBD_SOCKET_CHECK_TIMEO_MIN 0U |
5d0b17f1 | 242 | #define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX |
c10bdcf9 | 243 | #define DRBD_SOCKET_CHECK_TIMEO_DEF 0U |
5d0b17f1 | 244 | #define DRBD_SOCKET_CHECK_TIMEO_SCALE '1' |
a5ca66c4 | 245 | |
c10bdcf9 CB |
246 | #define DRBD_RS_DISCARD_GRANULARITY_MIN 0U |
247 | #define DRBD_RS_DISCARD_GRANULARITY_MAX (1U<<20) /* 1MiByte */ | |
248 | #define DRBD_RS_DISCARD_GRANULARITY_DEF 0U /* disabled by default */ | |
a5ca66c4 PR |
249 | #define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */ |
250 | ||
b411b363 | 251 | #endif |