Commit | Line | Data |
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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 | |
19 | #define DRBD_MINOR_COUNT_MAX 255 | |
20 | ||
21 | #define DRBD_DIALOG_REFRESH_MIN 0 | |
22 | #define DRBD_DIALOG_REFRESH_MAX 600 | |
23 | ||
24 | /* valid port number */ | |
25 | #define DRBD_PORT_MIN 1 | |
26 | #define DRBD_PORT_MAX 0xffff | |
27 | ||
28 | /* startup { */ | |
29 | /* if you want more than 3.4 days, disable */ | |
30 | #define DRBD_WFC_TIMEOUT_MIN 0 | |
31 | #define DRBD_WFC_TIMEOUT_MAX 300000 | |
32 | #define DRBD_WFC_TIMEOUT_DEF 0 | |
33 | ||
34 | #define DRBD_DEGR_WFC_TIMEOUT_MIN 0 | |
35 | #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000 | |
36 | #define DRBD_DEGR_WFC_TIMEOUT_DEF 0 | |
37 | ||
38 | #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0 | |
39 | #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000 | |
40 | #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0 | |
41 | /* }*/ | |
42 | ||
43 | /* net { */ | |
44 | /* timeout, unit centi seconds | |
45 | * more than one minute timeout is not usefull */ | |
46 | #define DRBD_TIMEOUT_MIN 1 | |
47 | #define DRBD_TIMEOUT_MAX 600 | |
48 | #define DRBD_TIMEOUT_DEF 60 /* 6 seconds */ | |
49 | ||
50 | /* active connection retries when C_WF_CONNECTION */ | |
51 | #define DRBD_CONNECT_INT_MIN 1 | |
52 | #define DRBD_CONNECT_INT_MAX 120 | |
53 | #define DRBD_CONNECT_INT_DEF 10 /* seconds */ | |
54 | ||
55 | /* keep-alive probes when idle */ | |
56 | #define DRBD_PING_INT_MIN 1 | |
57 | #define DRBD_PING_INT_MAX 120 | |
58 | #define DRBD_PING_INT_DEF 10 | |
59 | ||
60 | /* timeout for the ping packets.*/ | |
61 | #define DRBD_PING_TIMEO_MIN 1 | |
62 | #define DRBD_PING_TIMEO_MAX 100 | |
63 | #define DRBD_PING_TIMEO_DEF 5 | |
64 | ||
65 | /* max number of write requests between write barriers */ | |
66 | #define DRBD_MAX_EPOCH_SIZE_MIN 1 | |
67 | #define DRBD_MAX_EPOCH_SIZE_MAX 20000 | |
68 | #define DRBD_MAX_EPOCH_SIZE_DEF 2048 | |
69 | ||
70 | /* I don't think that a tcp send buffer of more than 10M is usefull */ | |
71 | #define DRBD_SNDBUF_SIZE_MIN 0 | |
72 | #define DRBD_SNDBUF_SIZE_MAX (10<<20) | |
89e1838f | 73 | #define DRBD_SNDBUF_SIZE_DEF 0 |
b411b363 PR |
74 | |
75 | #define DRBD_RCVBUF_SIZE_MIN 0 | |
76 | #define DRBD_RCVBUF_SIZE_MAX (10<<20) | |
89e1838f | 77 | #define DRBD_RCVBUF_SIZE_DEF 0 |
b411b363 PR |
78 | |
79 | /* @4k PageSize -> 128kB - 512MB */ | |
80 | #define DRBD_MAX_BUFFERS_MIN 32 | |
81 | #define DRBD_MAX_BUFFERS_MAX 131072 | |
82 | #define DRBD_MAX_BUFFERS_DEF 2048 | |
83 | ||
84 | /* @4k PageSize -> 4kB - 512MB */ | |
85 | #define DRBD_UNPLUG_WATERMARK_MIN 1 | |
86 | #define DRBD_UNPLUG_WATERMARK_MAX 131072 | |
87 | #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16) | |
88 | ||
89 | /* 0 is disabled. | |
90 | * 200 should be more than enough even for very short timeouts */ | |
91 | #define DRBD_KO_COUNT_MIN 0 | |
92 | #define DRBD_KO_COUNT_MAX 200 | |
93 | #define DRBD_KO_COUNT_DEF 0 | |
94 | /* } */ | |
95 | ||
96 | /* syncer { */ | |
97 | /* FIXME allow rate to be zero? */ | |
98 | #define DRBD_RATE_MIN 1 | |
99 | /* channel bonding 10 GbE, or other hardware */ | |
100 | #define DRBD_RATE_MAX (4 << 20) | |
101 | #define DRBD_RATE_DEF 250 /* kb/second */ | |
102 | ||
103 | /* less than 7 would hit performance unneccessarily. | |
104 | * 3833 is the largest prime that still does fit | |
105 | * into 64 sectors of activity log */ | |
106 | #define DRBD_AL_EXTENTS_MIN 7 | |
107 | #define DRBD_AL_EXTENTS_MAX 3833 | |
108 | #define DRBD_AL_EXTENTS_DEF 127 | |
109 | ||
110 | #define DRBD_AFTER_MIN -1 | |
111 | #define DRBD_AFTER_MAX 255 | |
112 | #define DRBD_AFTER_DEF -1 | |
113 | ||
114 | /* } */ | |
115 | ||
116 | /* drbdsetup XY resize -d Z | |
117 | * you are free to reduce the device size to nothing, if you want to. | |
118 | * the upper limit with 64bit kernel, enough ram and flexible meta data | |
119 | * is 16 TB, currently. */ | |
120 | /* DRBD_MAX_SECTORS */ | |
121 | #define DRBD_DISK_SIZE_SECT_MIN 0 | |
122 | #define DRBD_DISK_SIZE_SECT_MAX (16 * (2LLU << 30)) | |
123 | #define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */ | |
124 | ||
125 | #define DRBD_ON_IO_ERROR_DEF EP_PASS_ON | |
126 | #define DRBD_FENCING_DEF FP_DONT_CARE | |
127 | #define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT | |
128 | #define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT | |
129 | #define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT | |
130 | #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT | |
131 | ||
132 | #define DRBD_MAX_BIO_BVECS_MIN 0 | |
133 | #define DRBD_MAX_BIO_BVECS_MAX 128 | |
134 | #define DRBD_MAX_BIO_BVECS_DEF 0 | |
135 | ||
136 | #undef RANGE | |
137 | #endif |