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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 #define DRBD_MINOR_COUNT_DEF 32
21 #define DRBD_MINOR_COUNT_SCALE '1'
22 
23 #define DRBD_VOLUME_MAX 65535
24 
25 #define DRBD_DIALOG_REFRESH_MIN 0
26 #define DRBD_DIALOG_REFRESH_MAX 600
27 #define DRBD_DIALOG_REFRESH_SCALE '1'
28 
29 /* valid port number */
30 #define DRBD_PORT_MIN 1
31 #define DRBD_PORT_MAX 0xffff
32 #define DRBD_PORT_SCALE '1'
33 
34 /* startup { */
35   /* if you want more than 3.4 days, disable */
36 #define DRBD_WFC_TIMEOUT_MIN 0
37 #define DRBD_WFC_TIMEOUT_MAX 300000
38 #define DRBD_WFC_TIMEOUT_DEF 0
39 #define DRBD_WFC_TIMEOUT_SCALE '1'
40 
41 #define DRBD_DEGR_WFC_TIMEOUT_MIN 0
42 #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
43 #define DRBD_DEGR_WFC_TIMEOUT_DEF 0
44 #define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'
45 
46 #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
47 #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
48 #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
49 #define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
50 /* }*/
51 
52 /* net { */
53   /* timeout, unit centi seconds
54    * more than one minute timeout is not useful */
55 #define DRBD_TIMEOUT_MIN 1
56 #define DRBD_TIMEOUT_MAX 600
57 #define DRBD_TIMEOUT_DEF 60       /* 6 seconds */
58 #define DRBD_TIMEOUT_SCALE '1'
59 
60  /* If backing disk takes longer than disk_timeout, mark the disk as failed */
61 #define DRBD_DISK_TIMEOUT_MIN 0    /* 0 = disabled */
62 #define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
63 #define DRBD_DISK_TIMEOUT_DEF 0    /* disabled */
64 #define DRBD_DISK_TIMEOUT_SCALE '1'
65 
66   /* active connection retries when C_WF_CONNECTION */
67 #define DRBD_CONNECT_INT_MIN 1
68 #define DRBD_CONNECT_INT_MAX 120
69 #define DRBD_CONNECT_INT_DEF 10   /* seconds */
70 #define DRBD_CONNECT_INT_SCALE '1'
71 
72   /* keep-alive probes when idle */
73 #define DRBD_PING_INT_MIN 1
74 #define DRBD_PING_INT_MAX 120
75 #define DRBD_PING_INT_DEF 10
76 #define DRBD_PING_INT_SCALE '1'
77 
78  /* timeout for the ping packets.*/
79 #define DRBD_PING_TIMEO_MIN  1
80 #define DRBD_PING_TIMEO_MAX  300
81 #define DRBD_PING_TIMEO_DEF  5
82 #define DRBD_PING_TIMEO_SCALE '1'
83 
84   /* max number of write requests between write barriers */
85 #define DRBD_MAX_EPOCH_SIZE_MIN 1
86 #define DRBD_MAX_EPOCH_SIZE_MAX 20000
87 #define DRBD_MAX_EPOCH_SIZE_DEF 2048
88 #define DRBD_MAX_EPOCH_SIZE_SCALE '1'
89 
90   /* I don't think that a tcp send buffer of more than 10M is useful */
91 #define DRBD_SNDBUF_SIZE_MIN  0
92 #define DRBD_SNDBUF_SIZE_MAX  (10<<20)
93 #define DRBD_SNDBUF_SIZE_DEF  0
94 #define DRBD_SNDBUF_SIZE_SCALE '1'
95 
96 #define DRBD_RCVBUF_SIZE_MIN  0
97 #define DRBD_RCVBUF_SIZE_MAX  (10<<20)
98 #define DRBD_RCVBUF_SIZE_DEF  0
99 #define DRBD_RCVBUF_SIZE_SCALE '1'
100 
101   /* @4k PageSize -> 128kB - 512MB */
102 #define DRBD_MAX_BUFFERS_MIN  32
103 #define DRBD_MAX_BUFFERS_MAX  131072
104 #define DRBD_MAX_BUFFERS_DEF  2048
105 #define DRBD_MAX_BUFFERS_SCALE '1'
106 
107   /* @4k PageSize -> 4kB - 512MB */
108 #define DRBD_UNPLUG_WATERMARK_MIN  1
109 #define DRBD_UNPLUG_WATERMARK_MAX  131072
110 #define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
111 #define DRBD_UNPLUG_WATERMARK_SCALE '1'
112 
113   /* 0 is disabled.
114    * 200 should be more than enough even for very short timeouts */
115 #define DRBD_KO_COUNT_MIN  0
116 #define DRBD_KO_COUNT_MAX  200
117 #define DRBD_KO_COUNT_DEF  7
118 #define DRBD_KO_COUNT_SCALE '1'
119 /* } */
120 
121 /* syncer { */
122   /* FIXME allow rate to be zero? */
123 #define DRBD_RESYNC_RATE_MIN 1
124 /* channel bonding 10 GbE, or other hardware */
125 #define DRBD_RESYNC_RATE_MAX (4 << 20)
126 #define DRBD_RESYNC_RATE_DEF 250
127 #define DRBD_RESYNC_RATE_SCALE 'k'  /* kilobytes */
128 
129   /* less than 7 would hit performance unnecessarily. */
130 #define DRBD_AL_EXTENTS_MIN  7
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  0xfffe
135 #define DRBD_AL_EXTENTS_DEF  1237
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  0
151 #define DRBD_DISK_SIZE_MAX  (1 * (2LLU << 40))
152 #define DRBD_DISK_SIZE_DEF  0 /* = 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 0
166 #define DRBD_MAX_BIO_BVECS_MAX 128
167 #define DRBD_MAX_BIO_BVECS_DEF 0
168 #define DRBD_MAX_BIO_BVECS_SCALE '1'
169 
170 #define DRBD_C_PLAN_AHEAD_MIN  0
171 #define DRBD_C_PLAN_AHEAD_MAX  300
172 #define DRBD_C_PLAN_AHEAD_DEF  20
173 #define DRBD_C_PLAN_AHEAD_SCALE '1'
174 
175 #define DRBD_C_DELAY_TARGET_MIN 1
176 #define DRBD_C_DELAY_TARGET_MAX 100
177 #define DRBD_C_DELAY_TARGET_DEF 10
178 #define DRBD_C_DELAY_TARGET_SCALE '1'
179 
180 #define DRBD_C_FILL_TARGET_MIN 0
181 #define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
182 #define DRBD_C_FILL_TARGET_DEF 100 /* 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     250
186 #define DRBD_C_MAX_RATE_MAX     (4 << 20)
187 #define DRBD_C_MAX_RATE_DEF     102400
188 #define DRBD_C_MAX_RATE_SCALE	'k'  /* kilobytes */
189 
190 #define DRBD_C_MIN_RATE_MIN     0
191 #define DRBD_C_MIN_RATE_MAX     (4 << 20)
192 #define DRBD_C_MIN_RATE_DEF     250
193 #define DRBD_C_MIN_RATE_SCALE	'k'  /* kilobytes */
194 
195 #define DRBD_CONG_FILL_MIN	0
196 #define DRBD_CONG_FILL_MAX	(10<<21) /* 10GByte in sectors */
197 #define DRBD_CONG_FILL_DEF	0
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	0
208 #define DRBD_DISK_FLUSHES_DEF	1
209 #define DRBD_DISK_DRAIN_DEF	1
210 #define DRBD_MD_FLUSHES_DEF	1
211 #define DRBD_TCP_CORK_DEF	1
212 #define DRBD_AL_UPDATES_DEF     1
213 
214 #define DRBD_ALLOW_TWO_PRIMARIES_DEF	0
215 #define DRBD_ALWAYS_ASBP_DEF	0
216 #define DRBD_USE_RLE_DEF	1
217 
218 #endif
219