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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 256
20#define DRBD_MINOR_COUNT_DEF 32
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
46 * more than one minute timeout is not useful */
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
71 /* I don't think that a tcp send buffer of more than 10M is useful */
72#define DRBD_SNDBUF_SIZE_MIN 0
73#define DRBD_SNDBUF_SIZE_MAX (10<<20)
74#define DRBD_SNDBUF_SIZE_DEF 0
75
76#define DRBD_RCVBUF_SIZE_MIN 0
77#define DRBD_RCVBUF_SIZE_MAX (10<<20)
78#define DRBD_RCVBUF_SIZE_DEF 0
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
104 /* less than 7 would hit performance unnecessarily.
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
120 * is 16 TB, currently. */
121/* DRBD_MAX_SECTORS */
122#define DRBD_DISK_SIZE_SECT_MIN 0
123#define DRBD_DISK_SIZE_SECT_MAX (16 * (2LLU << 30))
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
132#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
133#define DRBD_ON_CONGESTION_DEF OC_BLOCK
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
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 */
142
143#define DRBD_C_DELAY_TARGET_MIN 1
144#define DRBD_C_DELAY_TARGET_MAX 100
145#define DRBD_C_DELAY_TARGET_DEF 10
146
147#define DRBD_C_FILL_TARGET_MIN 0
148#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
149#define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */
150
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
154
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
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
167#undef RANGE
168#endif