3 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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.
14 #define DRBD_LIMITS_H 1
16 #define DEBUG_RANGE_CHECK 0
18 #define DRBD_MINOR_COUNT_MIN 1
19 #define DRBD_MINOR_COUNT_MAX 256
20 #define DRBD_MINOR_COUNT_DEF 32
22 #define DRBD_DIALOG_REFRESH_MIN 0
23 #define DRBD_DIALOG_REFRESH_MAX 600
25 /* valid port number */
26 #define DRBD_PORT_MIN 1
27 #define DRBD_PORT_MAX 0xffff
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
35 #define DRBD_DEGR_WFC_TIMEOUT_MIN 0
36 #define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
37 #define DRBD_DEGR_WFC_TIMEOUT_DEF 0
39 #define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
40 #define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
41 #define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
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 */
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 */
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
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
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
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
76 #define DRBD_RCVBUF_SIZE_MIN 0
77 #define DRBD_RCVBUF_SIZE_MAX (10<<20)
78 #define DRBD_RCVBUF_SIZE_DEF 0
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
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)
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
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 */
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
111 #define DRBD_AFTER_MIN -1
112 #define DRBD_AFTER_MAX 255
113 #define DRBD_AFTER_DEF -1
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 1 PiB, currently. */
121 /* DRBD_MAX_SECTORS */
122 #define DRBD_DISK_SIZE_SECT_MIN 0
123 #define DRBD_DISK_SIZE_SECT_MAX (1 * (2LLU << 40))
124 #define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */
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
135 #define DRBD_MAX_BIO_BVECS_MIN 0
136 #define DRBD_MAX_BIO_BVECS_MAX 128
137 #define DRBD_MAX_BIO_BVECS_DEF 0
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 */
143 #define DRBD_C_DELAY_TARGET_MIN 1
144 #define DRBD_C_DELAY_TARGET_MAX 100
145 #define DRBD_C_DELAY_TARGET_DEF 10
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 */
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
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
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
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
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