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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) |
73 | #define DRBD_SNDBUF_SIZE_DEF 0 |
74 | |
75 | #define DRBD_RCVBUF_SIZE_MIN 0 |
76 | #define DRBD_RCVBUF_SIZE_MAX (10<<20) |
77 | #define DRBD_RCVBUF_SIZE_DEF 0 |
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 |
138 |
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