summaryrefslogtreecommitdiffstats
path: root/include/linux/drbd_limits.h
blob: 1fa19c5f5e64a0f03d8ffb98234983ae79b68e67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/*
  drbd_limits.h
  This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
*/

/*
 * Our current limitations.
 * Some of them are hard limits,
 * some of them are arbitrary range limits, that make it easier to provide
 * feedback about nonsense settings for certain configurable values.
 */

#ifndef DRBD_LIMITS_H
#define DRBD_LIMITS_H 1

#define DEBUG_RANGE_CHECK 0

#define DRBD_MINOR_COUNT_MIN 1
#define DRBD_MINOR_COUNT_MAX 255
#define DRBD_MINOR_COUNT_DEF 32
#define DRBD_MINOR_COUNT_SCALE '1'

#define DRBD_VOLUME_MAX 65535

#define DRBD_DIALOG_REFRESH_MIN 0
#define DRBD_DIALOG_REFRESH_MAX 600
#define DRBD_DIALOG_REFRESH_SCALE '1'

/* valid port number */
#define DRBD_PORT_MIN 1
#define DRBD_PORT_MAX 0xffff
#define DRBD_PORT_SCALE '1'

/* startup { */
  /* if you want more than 3.4 days, disable */
#define DRBD_WFC_TIMEOUT_MIN 0
#define DRBD_WFC_TIMEOUT_MAX 300000
#define DRBD_WFC_TIMEOUT_DEF 0
#define DRBD_WFC_TIMEOUT_SCALE '1'

#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
#define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'

#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
#define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
/* }*/

/* net { */
  /* timeout, unit centi seconds
   * more than one minute timeout is not useful */
#define DRBD_TIMEOUT_MIN 1
#define DRBD_TIMEOUT_MAX 600
#define DRBD_TIMEOUT_DEF 60       /* 6 seconds */
#define DRBD_TIMEOUT_SCALE '1'

 /* If backing disk takes longer than disk_timeout, mark the disk as failed */
#define DRBD_DISK_TIMEOUT_MIN 0    /* 0 = disabled */
#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
#define DRBD_DISK_TIMEOUT_DEF 0    /* disabled */
#define DRBD_DISK_TIMEOUT_SCALE '1'

  /* active connection retries when C_WF_CONNECTION */
#define DRBD_CONNECT_INT_MIN 1
#define DRBD_CONNECT_INT_MAX 120
#define DRBD_CONNECT_INT_DEF 10   /* seconds */
#define DRBD_CONNECT_INT_SCALE '1'

  /* keep-alive probes when idle */
#define DRBD_PING_INT_MIN 1
#define DRBD_PING_INT_MAX 120
#define DRBD_PING_INT_DEF 10
#define DRBD_PING_INT_SCALE '1'

 /* timeout for the ping packets.*/
#define DRBD_PING_TIMEO_MIN  1
#define DRBD_PING_TIMEO_MAX  300
#define DRBD_PING_TIMEO_DEF  5
#define DRBD_PING_TIMEO_SCALE '1'

  /* max number of write requests between write barriers */
#define DRBD_MAX_EPOCH_SIZE_MIN 1
#define DRBD_MAX_EPOCH_SIZE_MAX 20000
#define DRBD_MAX_EPOCH_SIZE_DEF 2048
#define DRBD_MAX_EPOCH_SIZE_SCALE '1'

  /* I don't think that a tcp send buffer of more than 10M is useful */
#define DRBD_SNDBUF_SIZE_MIN  0
#define DRBD_SNDBUF_SIZE_MAX  (10<<20)
#define DRBD_SNDBUF_SIZE_DEF  0
#define DRBD_SNDBUF_SIZE_SCALE '1'

#define DRBD_RCVBUF_SIZE_MIN  0
#define DRBD_RCVBUF_SIZE_MAX  (10<<20)
#define DRBD_RCVBUF_SIZE_DEF  0
#define DRBD_RCVBUF_SIZE_SCALE '1'

  /* @4k PageSize -> 128kB - 512MB */
#define DRBD_MAX_BUFFERS_MIN  32
#define DRBD_MAX_BUFFERS_MAX  131072
#define DRBD_MAX_BUFFERS_DEF  2048
#define DRBD_MAX_BUFFERS_SCALE '1'

  /* @4k PageSize -> 4kB - 512MB */
#define DRBD_UNPLUG_WATERMARK_MIN  1
#define DRBD_UNPLUG_WATERMARK_MAX  131072
#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
#define DRBD_UNPLUG_WATERMARK_SCALE '1'

  /* 0 is disabled.
   * 200 should be more than enough even for very short timeouts */
#define DRBD_KO_COUNT_MIN  0
#define DRBD_KO_COUNT_MAX  200
#define DRBD_KO_COUNT_DEF  7
#define DRBD_KO_COUNT_SCALE '1'
/* } */

/* syncer { */
  /* FIXME allow rate to be zero? */
#define DRBD_RESYNC_RATE_MIN 1
/* channel bonding 10 GbE, or other hardware */
#define DRBD_RESYNC_RATE_MAX (4 << 20)
#define DRBD_RESYNC_RATE_DEF 250
#define DRBD_RESYNC_RATE_SCALE 'k'  /* kilobytes */

  /* less than 7 would hit performance unnecessarily.
   * 919 slots context information per transaction,
   * 32k activity log, 4k transaction size,
   * one transaction in flight:
   * 919 * 7 = 6433 */
#define DRBD_AL_EXTENTS_MIN  7
#define DRBD_AL_EXTENTS_MAX  6433
#define DRBD_AL_EXTENTS_DEF  1237
#define DRBD_AL_EXTENTS_SCALE '1'

#define DRBD_MINOR_NUMBER_MIN  -1
#define DRBD_MINOR_NUMBER_MAX  ((1 << 20) - 1)
#define DRBD_MINOR_NUMBER_DEF  -1
#define DRBD_MINOR_NUMBER_SCALE '1'

/* } */

/* drbdsetup XY resize -d Z
 * you are free to reduce the device size to nothing, if you want to.
 * the upper limit with 64bit kernel, enough ram and flexible meta data
 * is 1 PiB, currently. */
/* DRBD_MAX_SECTORS */
#define DRBD_DISK_SIZE_MIN  0
#define DRBD_DISK_SIZE_MAX  (1 * (2LLU << 40))
#define DRBD_DISK_SIZE_DEF  0 /* = disabled = no user size... */
#define DRBD_DISK_SIZE_SCALE 's'  /* sectors */

#define DRBD_ON_IO_ERROR_DEF EP_DETACH
#define DRBD_FENCING_DEF FP_DONT_CARE
#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
#define DRBD_ON_CONGESTION_DEF OC_BLOCK
#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL

#define DRBD_MAX_BIO_BVECS_MIN 0
#define DRBD_MAX_BIO_BVECS_MAX 128
#define DRBD_MAX_BIO_BVECS_DEF 0
#define DRBD_MAX_BIO_BVECS_SCALE '1'

#define DRBD_C_PLAN_AHEAD_MIN  0
#define DRBD_C_PLAN_AHEAD_MAX  300
#define DRBD_C_PLAN_AHEAD_DEF  20
#define DRBD_C_PLAN_AHEAD_SCALE '1'

#define DRBD_C_DELAY_TARGET_MIN 1
#define DRBD_C_DELAY_TARGET_MAX 100
#define DRBD_C_DELAY_TARGET_DEF 10
#define DRBD_C_DELAY_TARGET_SCALE '1'

#define DRBD_C_FILL_TARGET_MIN 0
#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
#define DRBD_C_FILL_TARGET_SCALE 's'  /* sectors */

#define DRBD_C_MAX_RATE_MIN     250
#define DRBD_C_MAX_RATE_MAX     (4 << 20)
#define DRBD_C_MAX_RATE_DEF     102400
#define DRBD_C_MAX_RATE_SCALE	'k'  /* kilobytes */

#define DRBD_C_MIN_RATE_MIN     0
#define DRBD_C_MIN_RATE_MAX     (4 << 20)
#define DRBD_C_MIN_RATE_DEF     250
#define DRBD_C_MIN_RATE_SCALE	'k'  /* kilobytes */

#define DRBD_CONG_FILL_MIN	0
#define DRBD_CONG_FILL_MAX	(10<<21) /* 10GByte in sectors */
#define DRBD_CONG_FILL_DEF	0
#define DRBD_CONG_FILL_SCALE	's'  /* sectors */

#define DRBD_CONG_EXTENTS_MIN	DRBD_AL_EXTENTS_MIN
#define DRBD_CONG_EXTENTS_MAX	DRBD_AL_EXTENTS_MAX
#define DRBD_CONG_EXTENTS_DEF	DRBD_AL_EXTENTS_DEF
#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE

#define DRBD_PROTOCOL_DEF DRBD_PROT_C

#define DRBD_DISK_BARRIER_DEF	0
#define DRBD_DISK_FLUSHES_DEF	1
#define DRBD_DISK_DRAIN_DEF	1
#define DRBD_MD_FLUSHES_DEF	1
#define DRBD_TCP_CORK_DEF	1
#define DRBD_AL_UPDATES_DEF     1

#define DRBD_ALLOW_TWO_PRIMARIES_DEF	0
#define DRBD_ALWAYS_ASBP_DEF	0
#define DRBD_USE_RLE_DEF	1

#endif
OpenPOWER on IntegriCloud