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 | |
2b8a90b5 PR |
19 | #define DRBD_MINOR_COUNT_MAX 256 |
20 | #define DRBD_MINOR_COUNT_DEF 32 | |
b411b363 PR |
21 | |
22 | #define DRBD_DIALOG_REFRESH_MIN 0 | |
23 | #define DRBD_DIALOG_REFRESH_MAX 600 | |
24 | ||
25 | /* valid port number */ | |
26 | #define DRBD_PORT_MIN 1 | |
27 | #define DRBD_PORT_MAX 0xffff | |
28 | ||
29 | /* startup { */ | |
30 | /* if you want more than 3.4 days, disable */ | |
31 | #define DRBD_WFC_TIMEOUT_MIN 0 | |
32 | #define DRBD_WFC_TIMEOUT_MAX 300000 | |
33 | #define DRBD_WFC_TIMEOUT_DEF 0 | |
34 | ||
35 | #define DRBD_DEGR_WFC_TIMEOUT_MIN 0 | |
36 | #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000 | |
37 | #define DRBD_DEGR_WFC_TIMEOUT_DEF 0 | |
38 | ||
39 | #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0 | |
40 | #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000 | |
41 | #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0 | |
42 | /* }*/ | |
43 | ||
44 | /* net { */ | |
45 | /* timeout, unit centi seconds | |
25985edc | 46 | * more than one minute timeout is not useful */ |
b411b363 PR |
47 | #define DRBD_TIMEOUT_MIN 1 |
48 | #define DRBD_TIMEOUT_MAX 600 | |
49 | #define DRBD_TIMEOUT_DEF 60 /* 6 seconds */ | |
50 | ||
51 | /* active connection retries when C_WF_CONNECTION */ | |
52 | #define DRBD_CONNECT_INT_MIN 1 | |
53 | #define DRBD_CONNECT_INT_MAX 120 | |
54 | #define DRBD_CONNECT_INT_DEF 10 /* seconds */ | |
55 | ||
56 | /* keep-alive probes when idle */ | |
57 | #define DRBD_PING_INT_MIN 1 | |
58 | #define DRBD_PING_INT_MAX 120 | |
59 | #define DRBD_PING_INT_DEF 10 | |
60 | ||
61 | /* timeout for the ping packets.*/ | |
62 | #define DRBD_PING_TIMEO_MIN 1 | |
63 | #define DRBD_PING_TIMEO_MAX 100 | |
64 | #define DRBD_PING_TIMEO_DEF 5 | |
65 | ||
66 | /* max number of write requests between write barriers */ | |
67 | #define DRBD_MAX_EPOCH_SIZE_MIN 1 | |
68 | #define DRBD_MAX_EPOCH_SIZE_MAX 20000 | |
69 | #define DRBD_MAX_EPOCH_SIZE_DEF 2048 | |
70 | ||
25985edc | 71 | /* I don't think that a tcp send buffer of more than 10M is useful */ |
b411b363 PR |
72 | #define DRBD_SNDBUF_SIZE_MIN 0 |
73 | #define DRBD_SNDBUF_SIZE_MAX (10<<20) | |
89e1838f | 74 | #define DRBD_SNDBUF_SIZE_DEF 0 |
b411b363 PR |
75 | |
76 | #define DRBD_RCVBUF_SIZE_MIN 0 | |
77 | #define DRBD_RCVBUF_SIZE_MAX (10<<20) | |
89e1838f | 78 | #define DRBD_RCVBUF_SIZE_DEF 0 |
b411b363 PR |
79 | |
80 | /* @4k PageSize -> 128kB - 512MB */ | |
81 | #define DRBD_MAX_BUFFERS_MIN 32 | |
82 | #define DRBD_MAX_BUFFERS_MAX 131072 | |
83 | #define DRBD_MAX_BUFFERS_DEF 2048 | |
84 | ||
85 | /* @4k PageSize -> 4kB - 512MB */ | |
86 | #define DRBD_UNPLUG_WATERMARK_MIN 1 | |
87 | #define DRBD_UNPLUG_WATERMARK_MAX 131072 | |
88 | #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16) | |
89 | ||
90 | /* 0 is disabled. | |
91 | * 200 should be more than enough even for very short timeouts */ | |
92 | #define DRBD_KO_COUNT_MIN 0 | |
93 | #define DRBD_KO_COUNT_MAX 200 | |
94 | #define DRBD_KO_COUNT_DEF 0 | |
95 | /* } */ | |
96 | ||
97 | /* syncer { */ | |
98 | /* FIXME allow rate to be zero? */ | |
99 | #define DRBD_RATE_MIN 1 | |
100 | /* channel bonding 10 GbE, or other hardware */ | |
101 | #define DRBD_RATE_MAX (4 << 20) | |
102 | #define DRBD_RATE_DEF 250 /* kb/second */ | |
103 | ||
25985edc | 104 | /* less than 7 would hit performance unnecessarily. |
b411b363 PR |
105 | * 3833 is the largest prime that still does fit |
106 | * into 64 sectors of activity log */ | |
107 | #define DRBD_AL_EXTENTS_MIN 7 | |
108 | #define DRBD_AL_EXTENTS_MAX 3833 | |
109 | #define DRBD_AL_EXTENTS_DEF 127 | |
110 | ||
111 | #define DRBD_AFTER_MIN -1 | |
112 | #define DRBD_AFTER_MAX 255 | |
113 | #define DRBD_AFTER_DEF -1 | |
114 | ||
115 | /* } */ | |
116 | ||
117 | /* drbdsetup XY resize -d Z | |
118 | * you are free to reduce the device size to nothing, if you want to. | |
119 | * the upper limit with 64bit kernel, enough ram and flexible meta data | |
15b493d1 | 120 | * is 1 PiB, currently. */ |
b411b363 PR |
121 | /* DRBD_MAX_SECTORS */ |
122 | #define DRBD_DISK_SIZE_SECT_MIN 0 | |
15b493d1 | 123 | #define DRBD_DISK_SIZE_SECT_MAX (1 * (2LLU << 40)) |
b411b363 PR |
124 | #define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */ |
125 | ||
126 | #define DRBD_ON_IO_ERROR_DEF EP_PASS_ON | |
127 | #define DRBD_FENCING_DEF FP_DONT_CARE | |
128 | #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT | |
129 | #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT | |
130 | #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT | |
131 | #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT | |
265be2d0 | 132 | #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR |
422028b1 | 133 | #define DRBD_ON_CONGESTION_DEF OC_BLOCK |
b411b363 PR |
134 | |
135 | #define DRBD_MAX_BIO_BVECS_MIN 0 | |
136 | #define DRBD_MAX_BIO_BVECS_MAX 128 | |
137 | #define DRBD_MAX_BIO_BVECS_DEF 0 | |
138 | ||
9a31d716 PR |
139 | #define DRBD_C_PLAN_AHEAD_MIN 0 |
140 | #define DRBD_C_PLAN_AHEAD_MAX 300 | |
141 | #define DRBD_C_PLAN_AHEAD_DEF 0 /* RS rate controller disabled by default */ | |
67c7ddd0 | 142 | |
9a31d716 PR |
143 | #define DRBD_C_DELAY_TARGET_MIN 1 |
144 | #define DRBD_C_DELAY_TARGET_MAX 100 | |
145 | #define DRBD_C_DELAY_TARGET_DEF 10 | |
67c7ddd0 | 146 | |
9a31d716 | 147 | #define DRBD_C_FILL_TARGET_MIN 0 |
00b42537 | 148 | #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */ |
9a31d716 | 149 | #define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */ |
67c7ddd0 | 150 | |
9a31d716 PR |
151 | #define DRBD_C_MAX_RATE_MIN 250 /* kByte/sec */ |
152 | #define DRBD_C_MAX_RATE_MAX (4 << 20) | |
153 | #define DRBD_C_MAX_RATE_DEF 102400 | |
67c7ddd0 | 154 | |
0f0601f4 LE |
155 | #define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */ |
156 | #define DRBD_C_MIN_RATE_MAX (4 << 20) | |
157 | #define DRBD_C_MIN_RATE_DEF 4096 | |
158 | ||
422028b1 PR |
159 | #define DRBD_CONG_FILL_MIN 0 |
160 | #define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */ | |
161 | #define DRBD_CONG_FILL_DEF 0 | |
162 | ||
163 | #define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN | |
164 | #define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX | |
165 | #define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF | |
166 | ||
b411b363 PR |
167 | #undef RANGE |
168 | #endif |