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Philipp Reisnerb411b362009-09-25 16:07:19 -07001/*
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
Philipp Reisner2b8a90b2011-01-10 11:15:17 +010019#define DRBD_MINOR_COUNT_MAX 256
20#define DRBD_MINOR_COUNT_DEF 32
Philipp Reisnerb411b362009-09-25 16:07:19 -070021
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
Lucas De Marchi25985ed2011-03-30 22:57:33 -030046 * more than one minute timeout is not useful */
Philipp Reisnerb411b362009-09-25 16:07:19 -070047#define DRBD_TIMEOUT_MIN 1
48#define DRBD_TIMEOUT_MAX 600
49#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
50
Philipp Reisnerdfa8bed2011-06-29 14:06:08 +020051 /* If backing disk takes longer than disk_timeout, mark the disk as failed */
52#define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */
53#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
54#define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */
55
Philipp Reisnerb411b362009-09-25 16:07:19 -070056 /* active connection retries when C_WF_CONNECTION */
57#define DRBD_CONNECT_INT_MIN 1
58#define DRBD_CONNECT_INT_MAX 120
59#define DRBD_CONNECT_INT_DEF 10 /* seconds */
60
61 /* keep-alive probes when idle */
62#define DRBD_PING_INT_MIN 1
63#define DRBD_PING_INT_MAX 120
64#define DRBD_PING_INT_DEF 10
65
66 /* timeout for the ping packets.*/
67#define DRBD_PING_TIMEO_MIN 1
Lars Ellenberg071cf1c2011-06-20 22:21:19 +020068#define DRBD_PING_TIMEO_MAX 300
Philipp Reisnerb411b362009-09-25 16:07:19 -070069#define DRBD_PING_TIMEO_DEF 5
70
71 /* max number of write requests between write barriers */
72#define DRBD_MAX_EPOCH_SIZE_MIN 1
73#define DRBD_MAX_EPOCH_SIZE_MAX 20000
74#define DRBD_MAX_EPOCH_SIZE_DEF 2048
75
Lucas De Marchi25985ed2011-03-30 22:57:33 -030076 /* I don't think that a tcp send buffer of more than 10M is useful */
Philipp Reisnerb411b362009-09-25 16:07:19 -070077#define DRBD_SNDBUF_SIZE_MIN 0
78#define DRBD_SNDBUF_SIZE_MAX (10<<20)
Lars Ellenberg89e18382009-09-21 10:46:22 +020079#define DRBD_SNDBUF_SIZE_DEF 0
Philipp Reisnerb411b362009-09-25 16:07:19 -070080
81#define DRBD_RCVBUF_SIZE_MIN 0
82#define DRBD_RCVBUF_SIZE_MAX (10<<20)
Lars Ellenberg89e18382009-09-21 10:46:22 +020083#define DRBD_RCVBUF_SIZE_DEF 0
Philipp Reisnerb411b362009-09-25 16:07:19 -070084
85 /* @4k PageSize -> 128kB - 512MB */
86#define DRBD_MAX_BUFFERS_MIN 32
87#define DRBD_MAX_BUFFERS_MAX 131072
88#define DRBD_MAX_BUFFERS_DEF 2048
89
90 /* @4k PageSize -> 4kB - 512MB */
91#define DRBD_UNPLUG_WATERMARK_MIN 1
92#define DRBD_UNPLUG_WATERMARK_MAX 131072
93#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
94
95 /* 0 is disabled.
96 * 200 should be more than enough even for very short timeouts */
97#define DRBD_KO_COUNT_MIN 0
98#define DRBD_KO_COUNT_MAX 200
99#define DRBD_KO_COUNT_DEF 0
100/* } */
101
102/* syncer { */
103 /* FIXME allow rate to be zero? */
104#define DRBD_RATE_MIN 1
105/* channel bonding 10 GbE, or other hardware */
106#define DRBD_RATE_MAX (4 << 20)
107#define DRBD_RATE_DEF 250 /* kb/second */
108
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300109 /* less than 7 would hit performance unnecessarily.
Philipp Reisnerb411b362009-09-25 16:07:19 -0700110 * 3833 is the largest prime that still does fit
111 * into 64 sectors of activity log */
112#define DRBD_AL_EXTENTS_MIN 7
113#define DRBD_AL_EXTENTS_MAX 3833
114#define DRBD_AL_EXTENTS_DEF 127
115
116#define DRBD_AFTER_MIN -1
117#define DRBD_AFTER_MAX 255
118#define DRBD_AFTER_DEF -1
119
120/* } */
121
122/* drbdsetup XY resize -d Z
123 * you are free to reduce the device size to nothing, if you want to.
124 * the upper limit with 64bit kernel, enough ram and flexible meta data
Lars Ellenberg15b493d2011-06-28 09:48:48 +0200125 * is 1 PiB, currently. */
Philipp Reisnerb411b362009-09-25 16:07:19 -0700126/* DRBD_MAX_SECTORS */
127#define DRBD_DISK_SIZE_SECT_MIN 0
Lars Ellenberg15b493d2011-06-28 09:48:48 +0200128#define DRBD_DISK_SIZE_SECT_MAX (1 * (2LLU << 40))
Philipp Reisnerb411b362009-09-25 16:07:19 -0700129#define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */
130
131#define DRBD_ON_IO_ERROR_DEF EP_PASS_ON
132#define DRBD_FENCING_DEF FP_DONT_CARE
133#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
134#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
135#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
136#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
Philipp Reisner265be2d2010-05-31 10:14:17 +0200137#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
Philipp Reisner422028b2010-10-27 11:12:07 +0200138#define DRBD_ON_CONGESTION_DEF OC_BLOCK
Philipp Reisnerb411b362009-09-25 16:07:19 -0700139
140#define DRBD_MAX_BIO_BVECS_MIN 0
141#define DRBD_MAX_BIO_BVECS_MAX 128
142#define DRBD_MAX_BIO_BVECS_DEF 0
143
Philipp Reisner9a31d712010-07-05 13:42:03 +0200144#define DRBD_C_PLAN_AHEAD_MIN 0
145#define DRBD_C_PLAN_AHEAD_MAX 300
146#define DRBD_C_PLAN_AHEAD_DEF 0 /* RS rate controller disabled by default */
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200147
Philipp Reisner9a31d712010-07-05 13:42:03 +0200148#define DRBD_C_DELAY_TARGET_MIN 1
149#define DRBD_C_DELAY_TARGET_MAX 100
150#define DRBD_C_DELAY_TARGET_DEF 10
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200151
Philipp Reisner9a31d712010-07-05 13:42:03 +0200152#define DRBD_C_FILL_TARGET_MIN 0
Philipp Reisner00b42532010-10-05 11:19:39 +0200153#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
Philipp Reisner9a31d712010-07-05 13:42:03 +0200154#define DRBD_C_FILL_TARGET_DEF 0 /* By default disabled -> controlled by delay_target */
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200155
Philipp Reisner9a31d712010-07-05 13:42:03 +0200156#define DRBD_C_MAX_RATE_MIN 250 /* kByte/sec */
157#define DRBD_C_MAX_RATE_MAX (4 << 20)
158#define DRBD_C_MAX_RATE_DEF 102400
Philipp Reisner67c7ddd2010-05-04 11:12:00 +0200159
Lars Ellenberg0f0601f2010-08-11 23:40:24 +0200160#define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */
161#define DRBD_C_MIN_RATE_MAX (4 << 20)
162#define DRBD_C_MIN_RATE_DEF 4096
163
Philipp Reisner422028b2010-10-27 11:12:07 +0200164#define DRBD_CONG_FILL_MIN 0
165#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
166#define DRBD_CONG_FILL_DEF 0
167
168#define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN
169#define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX
170#define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF
171
Philipp Reisnerb411b362009-09-25 16:07:19 -0700172#undef RANGE
173#endif