Commit | Line | Data |
---|---|---|
b411b363 PR |
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 | |
65d94927 | 19 | #define DRBD_MINOR_COUNT_MAX (1U << 20) |
2b8a90b5 | 20 | #define DRBD_MINOR_COUNT_DEF 32 |
b411b363 | 21 | |
0c8e36d9 AG |
22 | #define DRBD_VOLUME_MAX 65535 |
23 | ||
b411b363 PR |
24 | #define DRBD_DIALOG_REFRESH_MIN 0 |
25 | #define DRBD_DIALOG_REFRESH_MAX 600 | |
26 | ||
27 | /* valid port number */ | |
28 | #define DRBD_PORT_MIN 1 | |
29 | #define DRBD_PORT_MAX 0xffff | |
30 | ||
31 | /* startup { */ | |
32 | /* if you want more than 3.4 days, disable */ | |
33 | #define DRBD_WFC_TIMEOUT_MIN 0 | |
34 | #define DRBD_WFC_TIMEOUT_MAX 300000 | |
35 | #define DRBD_WFC_TIMEOUT_DEF 0 | |
36 | ||
37 | #define DRBD_DEGR_WFC_TIMEOUT_MIN 0 | |
38 | #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000 | |
39 | #define DRBD_DEGR_WFC_TIMEOUT_DEF 0 | |
40 | ||
41 | #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0 | |
42 | #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000 | |
43 | #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0 | |
44 | /* }*/ | |
45 | ||
46 | /* net { */ | |
47 | /* timeout, unit centi seconds | |
25985edc | 48 | * more than one minute timeout is not useful */ |
b411b363 PR |
49 | #define DRBD_TIMEOUT_MIN 1 |
50 | #define DRBD_TIMEOUT_MAX 600 | |
51 | #define DRBD_TIMEOUT_DEF 60 /* 6 seconds */ | |
52 | ||
cdfda633 PR |
53 | /* If backing disk takes longer than disk_timeout, mark the disk as failed */ |
54 | #define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */ | |
55 | #define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */ | |
56 | #define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */ | |
57 | #define DRBD_DISK_TIMEOUT_SCALE '1' | |
58 | ||
b411b363 PR |
59 | /* active connection retries when C_WF_CONNECTION */ |
60 | #define DRBD_CONNECT_INT_MIN 1 | |
61 | #define DRBD_CONNECT_INT_MAX 120 | |
62 | #define DRBD_CONNECT_INT_DEF 10 /* seconds */ | |
63 | ||
64 | /* keep-alive probes when idle */ | |
65 | #define DRBD_PING_INT_MIN 1 | |
66 | #define DRBD_PING_INT_MAX 120 | |
67 | #define DRBD_PING_INT_DEF 10 | |
68 | ||
69 | /* timeout for the ping packets.*/ | |
70 | #define DRBD_PING_TIMEO_MIN 1 | |
f03c2549 | 71 | #define DRBD_PING_TIMEO_MAX 300 |
b411b363 PR |
72 | #define DRBD_PING_TIMEO_DEF 5 |
73 | ||
74 | /* max number of write requests between write barriers */ | |
75 | #define DRBD_MAX_EPOCH_SIZE_MIN 1 | |
76 | #define DRBD_MAX_EPOCH_SIZE_MAX 20000 | |
77 | #define DRBD_MAX_EPOCH_SIZE_DEF 2048 | |
78 | ||
25985edc | 79 | /* I don't think that a tcp send buffer of more than 10M is useful */ |
b411b363 PR |
80 | #define DRBD_SNDBUF_SIZE_MIN 0 |
81 | #define DRBD_SNDBUF_SIZE_MAX (10<<20) | |
89e1838f | 82 | #define DRBD_SNDBUF_SIZE_DEF 0 |
b411b363 PR |
83 | |
84 | #define DRBD_RCVBUF_SIZE_MIN 0 | |
85 | #define DRBD_RCVBUF_SIZE_MAX (10<<20) | |
89e1838f | 86 | #define DRBD_RCVBUF_SIZE_DEF 0 |
b411b363 PR |
87 | |
88 | /* @4k PageSize -> 128kB - 512MB */ | |
89 | #define DRBD_MAX_BUFFERS_MIN 32 | |
90 | #define DRBD_MAX_BUFFERS_MAX 131072 | |
91 | #define DRBD_MAX_BUFFERS_DEF 2048 | |
92 | ||
93 | /* @4k PageSize -> 4kB - 512MB */ | |
94 | #define DRBD_UNPLUG_WATERMARK_MIN 1 | |
95 | #define DRBD_UNPLUG_WATERMARK_MAX 131072 | |
96 | #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16) | |
97 | ||
98 | /* 0 is disabled. | |
99 | * 200 should be more than enough even for very short timeouts */ | |
100 | #define DRBD_KO_COUNT_MIN 0 | |
101 | #define DRBD_KO_COUNT_MAX 200 | |
65d94927 | 102 | #define DRBD_KO_COUNT_DEF 7 |
b411b363 PR |
103 | /* } */ |
104 | ||
105 | /* syncer { */ | |
106 | /* FIXME allow rate to be zero? */ | |
6394b935 | 107 | #define DRBD_RESYNC_RATE_MIN 1 |
b411b363 | 108 | /* channel bonding 10 GbE, or other hardware */ |
6394b935 AG |
109 | #define DRBD_RESYNC_RATE_MAX (4 << 20) |
110 | #define DRBD_RESYNC_RATE_DEF 250 | |
111 | #define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */ | |
b411b363 | 112 | |
25985edc | 113 | /* less than 7 would hit performance unnecessarily. |
7ad651b5 LE |
114 | * 919 slots context information per transaction, |
115 | * 32k activity log, 4k transaction size, | |
116 | * one transaction in flight: | |
117 | * 919 * 7 = 6433 */ | |
b411b363 | 118 | #define DRBD_AL_EXTENTS_MIN 7 |
7ad651b5 | 119 | #define DRBD_AL_EXTENTS_MAX 6433 |
65d94927 | 120 | #define DRBD_AL_EXTENTS_DEF 1237 |
b411b363 | 121 | |
309f0b70 AG |
122 | #define DRBD_MINOR_NUMBER_MIN -1 |
123 | #define DRBD_MINOR_NUMBER_MAX (1<<30) | |
124 | #define DRBD_MINOR_NUMBER_DEF -1 | |
125 | #define DRBD_MINOR_NUMBER_SCALE '1' | |
b411b363 PR |
126 | |
127 | /* } */ | |
128 | ||
129 | /* drbdsetup XY resize -d Z | |
130 | * you are free to reduce the device size to nothing, if you want to. | |
131 | * the upper limit with 64bit kernel, enough ram and flexible meta data | |
15b493d1 | 132 | * is 1 PiB, currently. */ |
b411b363 | 133 | /* DRBD_MAX_SECTORS */ |
c5482bbd | 134 | #define DRBD_DISK_SIZE_MIN 0 |
d942ae44 | 135 | #define DRBD_DISK_SIZE_MAX (1 * (2LLU << 40)) |
c5482bbd AG |
136 | #define DRBD_DISK_SIZE_DEF 0 /* = disabled = no user size... */ |
137 | #define DRBD_DISK_SIZE_SCALE 's' /* sectors */ | |
b411b363 | 138 | |
a5df0e19 | 139 | #define DRBD_ON_IO_ERROR_DEF EP_DETACH |
b411b363 PR |
140 | #define DRBD_FENCING_DEF FP_DONT_CARE |
141 | #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT | |
142 | #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT | |
143 | #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT | |
144 | #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT | |
265be2d0 | 145 | #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR |
422028b1 | 146 | #define DRBD_ON_CONGESTION_DEF OC_BLOCK |
b411b363 PR |
147 | |
148 | #define DRBD_MAX_BIO_BVECS_MIN 0 | |
149 | #define DRBD_MAX_BIO_BVECS_MAX 128 | |
150 | #define DRBD_MAX_BIO_BVECS_DEF 0 | |
151 | ||
9a31d716 PR |
152 | #define DRBD_C_PLAN_AHEAD_MIN 0 |
153 | #define DRBD_C_PLAN_AHEAD_MAX 300 | |
65d94927 | 154 | #define DRBD_C_PLAN_AHEAD_DEF 20 |
67c7ddd0 | 155 | |
9a31d716 PR |
156 | #define DRBD_C_DELAY_TARGET_MIN 1 |
157 | #define DRBD_C_DELAY_TARGET_MAX 100 | |
158 | #define DRBD_C_DELAY_TARGET_DEF 10 | |
67c7ddd0 | 159 | |
9a31d716 | 160 | #define DRBD_C_FILL_TARGET_MIN 0 |
00b42537 | 161 | #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */ |
65d94927 | 162 | #define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */ |
67c7ddd0 | 163 | |
9a31d716 PR |
164 | #define DRBD_C_MAX_RATE_MIN 250 /* kByte/sec */ |
165 | #define DRBD_C_MAX_RATE_MAX (4 << 20) | |
166 | #define DRBD_C_MAX_RATE_DEF 102400 | |
67c7ddd0 | 167 | |
0f0601f4 LE |
168 | #define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */ |
169 | #define DRBD_C_MIN_RATE_MAX (4 << 20) | |
65d94927 | 170 | #define DRBD_C_MIN_RATE_DEF 250 |
0f0601f4 | 171 | |
422028b1 PR |
172 | #define DRBD_CONG_FILL_MIN 0 |
173 | #define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */ | |
174 | #define DRBD_CONG_FILL_DEF 0 | |
175 | ||
176 | #define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN | |
177 | #define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX | |
178 | #define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF | |
179 | ||
f399002e LE |
180 | #define DRBD_PROTOCOL_DEF DRBD_PROT_C |
181 | ||
7bac3e6f AG |
182 | #define DRBD_DISK_BARRIER_DEF 0 |
183 | #define DRBD_DISK_FLUSHES_DEF 1 | |
184 | #define DRBD_DISK_DRAIN_DEF 1 | |
185 | #define DRBD_MD_FLUSHES_DEF 1 | |
186 | #define DRBD_TCP_CORK_DEF 1 | |
187 | ||
188 | #define DRBD_ALLOW_TWO_PRIMARIES_DEF 0 | |
189 | #define DRBD_ALWAYS_ASBP_DEF 0 | |
65d94927 | 190 | #define DRBD_USE_RLE_DEF 1 |
7bac3e6f | 191 | |
b411b363 | 192 | #endif |