1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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 | |
19 | #define DRBD_MINOR_COUNT_MIN 1U |
20 | #define DRBD_MINOR_COUNT_MAX 255U |
21 | #define DRBD_MINOR_COUNT_DEF 32U |
22 | #define DRBD_MINOR_COUNT_SCALE '1' |
23 | |
24 | #define DRBD_VOLUME_MAX 65534U |
25 | |
26 | #define DRBD_DIALOG_REFRESH_MIN 0U |
27 | #define DRBD_DIALOG_REFRESH_MAX 600U |
28 | #define DRBD_DIALOG_REFRESH_SCALE '1' |
29 | |
30 | /* valid port number */ |
31 | #define DRBD_PORT_MIN 1U |
32 | #define DRBD_PORT_MAX 0xffffU |
33 | #define DRBD_PORT_SCALE '1' |
34 | |
35 | /* startup { */ |
36 | /* if you want more than 3.4 days, disable */ |
37 | #define DRBD_WFC_TIMEOUT_MIN 0U |
38 | #define DRBD_WFC_TIMEOUT_MAX 300000U |
39 | #define DRBD_WFC_TIMEOUT_DEF 0U |
40 | #define DRBD_WFC_TIMEOUT_SCALE '1' |
41 | |
42 | #define DRBD_DEGR_WFC_TIMEOUT_MIN 0U |
43 | #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000U |
44 | #define DRBD_DEGR_WFC_TIMEOUT_DEF 0U |
45 | #define DRBD_DEGR_WFC_TIMEOUT_SCALE '1' |
46 | |
47 | #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0U |
48 | #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000U |
49 | #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0U |
50 | #define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1' |
51 | /* }*/ |
52 | |
53 | /* net { */ |
54 | /* timeout, unit centi seconds |
55 | * more than one minute timeout is not useful */ |
56 | #define DRBD_TIMEOUT_MIN 1U |
57 | #define DRBD_TIMEOUT_MAX 600U |
58 | #define DRBD_TIMEOUT_DEF 60U /* 6 seconds */ |
59 | #define DRBD_TIMEOUT_SCALE '1' |
60 | |
61 | /* If backing disk takes longer than disk_timeout, mark the disk as failed */ |
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 */ |
65 | #define DRBD_DISK_TIMEOUT_SCALE '1' |
66 | |
67 | /* active connection retries when C_WF_CONNECTION */ |
68 | #define DRBD_CONNECT_INT_MIN 1U |
69 | #define DRBD_CONNECT_INT_MAX 120U |
70 | #define DRBD_CONNECT_INT_DEF 10U /* seconds */ |
71 | #define DRBD_CONNECT_INT_SCALE '1' |
72 | |
73 | /* keep-alive probes when idle */ |
74 | #define DRBD_PING_INT_MIN 1U |
75 | #define DRBD_PING_INT_MAX 120U |
76 | #define DRBD_PING_INT_DEF 10U |
77 | #define DRBD_PING_INT_SCALE '1' |
78 | |
79 | /* timeout for the ping packets.*/ |
80 | #define DRBD_PING_TIMEO_MIN 1U |
81 | #define DRBD_PING_TIMEO_MAX 300U |
82 | #define DRBD_PING_TIMEO_DEF 5U |
83 | #define DRBD_PING_TIMEO_SCALE '1' |
84 | |
85 | /* max number of write requests between write barriers */ |
86 | #define DRBD_MAX_EPOCH_SIZE_MIN 1U |
87 | #define DRBD_MAX_EPOCH_SIZE_MAX 20000U |
88 | #define DRBD_MAX_EPOCH_SIZE_DEF 2048U |
89 | #define DRBD_MAX_EPOCH_SIZE_SCALE '1' |
90 | |
91 | /* I don't think that a tcp send buffer of more than 10M is useful */ |
92 | #define DRBD_SNDBUF_SIZE_MIN 0U |
93 | #define DRBD_SNDBUF_SIZE_MAX (10U<<20) |
94 | #define DRBD_SNDBUF_SIZE_DEF 0U |
95 | #define DRBD_SNDBUF_SIZE_SCALE '1' |
96 | |
97 | #define DRBD_RCVBUF_SIZE_MIN 0U |
98 | #define DRBD_RCVBUF_SIZE_MAX (10U<<20) |
99 | #define DRBD_RCVBUF_SIZE_DEF 0U |
100 | #define DRBD_RCVBUF_SIZE_SCALE '1' |
101 | |
102 | /* @4k PageSize -> 128kB - 512MB */ |
103 | #define DRBD_MAX_BUFFERS_MIN 32U |
104 | #define DRBD_MAX_BUFFERS_MAX 131072U |
105 | #define DRBD_MAX_BUFFERS_DEF 2048U |
106 | #define DRBD_MAX_BUFFERS_SCALE '1' |
107 | |
108 | /* @4k PageSize -> 4kB - 512MB */ |
109 | #define DRBD_UNPLUG_WATERMARK_MIN 1U |
110 | #define DRBD_UNPLUG_WATERMARK_MAX 131072U |
111 | #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16) |
112 | #define DRBD_UNPLUG_WATERMARK_SCALE '1' |
113 | |
114 | /* 0 is disabled. |
115 | * 200 should be more than enough even for very short timeouts */ |
116 | #define DRBD_KO_COUNT_MIN 0U |
117 | #define DRBD_KO_COUNT_MAX 200U |
118 | #define DRBD_KO_COUNT_DEF 7U |
119 | #define DRBD_KO_COUNT_SCALE '1' |
120 | /* } */ |
121 | |
122 | /* syncer { */ |
123 | /* FIXME allow rate to be zero? */ |
124 | #define DRBD_RESYNC_RATE_MIN 1U |
125 | /* channel bonding 10 GbE, or other hardware */ |
126 | #define DRBD_RESYNC_RATE_MAX (4 << 20) |
127 | #define DRBD_RESYNC_RATE_DEF 250U |
128 | #define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */ |
129 | |
130 | #define DRBD_AL_EXTENTS_MIN 67U |
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: */ |
134 | #define DRBD_AL_EXTENTS_MAX 0xfffeU |
135 | #define DRBD_AL_EXTENTS_DEF 1237U |
136 | #define DRBD_AL_EXTENTS_SCALE '1' |
137 | |
138 | #define DRBD_MINOR_NUMBER_MIN -1 |
139 | #define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1) |
140 | #define DRBD_MINOR_NUMBER_DEF -1 |
141 | #define DRBD_MINOR_NUMBER_SCALE '1' |
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 |
148 | * is 1 PiB, currently. */ |
149 | /* DRBD_MAX_SECTORS */ |
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... */ |
153 | #define DRBD_DISK_SIZE_SCALE 's' /* sectors */ |
154 | |
155 | #define DRBD_ON_IO_ERROR_DEF EP_DETACH |
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 |
161 | #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR |
162 | #define DRBD_ON_CONGESTION_DEF OC_BLOCK |
163 | #define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL |
164 | |
165 | #define DRBD_MAX_BIO_BVECS_MIN 0U |
166 | #define DRBD_MAX_BIO_BVECS_MAX 128U |
167 | #define DRBD_MAX_BIO_BVECS_DEF 0U |
168 | #define DRBD_MAX_BIO_BVECS_SCALE '1' |
169 | |
170 | #define DRBD_C_PLAN_AHEAD_MIN 0U |
171 | #define DRBD_C_PLAN_AHEAD_MAX 300U |
172 | #define DRBD_C_PLAN_AHEAD_DEF 20U |
173 | #define DRBD_C_PLAN_AHEAD_SCALE '1' |
174 | |
175 | #define DRBD_C_DELAY_TARGET_MIN 1U |
176 | #define DRBD_C_DELAY_TARGET_MAX 100U |
177 | #define DRBD_C_DELAY_TARGET_DEF 10U |
178 | #define DRBD_C_DELAY_TARGET_SCALE '1' |
179 | |
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 */ |
183 | #define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */ |
184 | |
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 |
188 | #define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */ |
189 | |
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 |
193 | #define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */ |
194 | |
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 |
198 | #define DRBD_CONG_FILL_SCALE 's' /* sectors */ |
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 |
203 | #define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE |
204 | |
205 | #define DRBD_PROTOCOL_DEF DRBD_PROT_C |
206 | |
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 |
213 | |
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. */ |
219 | #define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1U |
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. */ |
224 | #define DRBD_DISABLE_WRITE_SAME_DEF 0U |
225 | |
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 |
230 | |
231 | #define DRBD_AL_STRIPES_MIN 1U |
232 | #define DRBD_AL_STRIPES_MAX 1024U |
233 | #define DRBD_AL_STRIPES_DEF 1U |
234 | #define DRBD_AL_STRIPES_SCALE '1' |
235 | |
236 | #define DRBD_AL_STRIPE_SIZE_MIN 4U |
237 | #define DRBD_AL_STRIPE_SIZE_MAX 16777216U |
238 | #define DRBD_AL_STRIPE_SIZE_DEF 32U |
239 | #define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */ |
240 | |
241 | #define DRBD_SOCKET_CHECK_TIMEO_MIN 0U |
242 | #define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX |
243 | #define DRBD_SOCKET_CHECK_TIMEO_DEF 0U |
244 | #define DRBD_SOCKET_CHECK_TIMEO_SCALE '1' |
245 | |
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 */ |
249 | #define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */ |
250 | |
251 | #endif |
252 | |