252 lines
7.8 KiB
C
252 lines
7.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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drbd_limits.h
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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*/
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/*
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* Our current limitations.
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* Some of them are hard limits,
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* some of them are arbitrary range limits, that make it easier to provide
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* feedback about nonsense settings for certain configurable values.
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*/
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#ifndef DRBD_LIMITS_H
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#define DRBD_LIMITS_H 1
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#define DEBUG_RANGE_CHECK 0
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#define DRBD_MINOR_COUNT_MIN 1
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#define DRBD_MINOR_COUNT_MAX 255
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#define DRBD_MINOR_COUNT_DEF 32
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#define DRBD_MINOR_COUNT_SCALE '1'
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#define DRBD_VOLUME_MAX 65535
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#define DRBD_DIALOG_REFRESH_MIN 0
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#define DRBD_DIALOG_REFRESH_MAX 600
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#define DRBD_DIALOG_REFRESH_SCALE '1'
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/* valid port number */
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#define DRBD_PORT_MIN 1
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#define DRBD_PORT_MAX 0xffff
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#define DRBD_PORT_SCALE '1'
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/* startup { */
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/* if you want more than 3.4 days, disable */
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#define DRBD_WFC_TIMEOUT_MIN 0
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#define DRBD_WFC_TIMEOUT_MAX 300000
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#define DRBD_WFC_TIMEOUT_DEF 0
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#define DRBD_WFC_TIMEOUT_SCALE '1'
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#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
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#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
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#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
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#define DRBD_DEGR_WFC_TIMEOUT_SCALE '1'
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#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
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#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
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#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
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#define DRBD_OUTDATED_WFC_TIMEOUT_SCALE '1'
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/* }*/
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/* net { */
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/* timeout, unit centi seconds
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* more than one minute timeout is not useful */
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#define DRBD_TIMEOUT_MIN 1
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#define DRBD_TIMEOUT_MAX 600
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#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
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#define DRBD_TIMEOUT_SCALE '1'
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/* If backing disk takes longer than disk_timeout, mark the disk as failed */
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#define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */
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#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
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#define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */
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#define DRBD_DISK_TIMEOUT_SCALE '1'
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/* active connection retries when C_WF_CONNECTION */
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#define DRBD_CONNECT_INT_MIN 1
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#define DRBD_CONNECT_INT_MAX 120
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#define DRBD_CONNECT_INT_DEF 10 /* seconds */
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#define DRBD_CONNECT_INT_SCALE '1'
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/* keep-alive probes when idle */
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#define DRBD_PING_INT_MIN 1
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#define DRBD_PING_INT_MAX 120
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#define DRBD_PING_INT_DEF 10
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#define DRBD_PING_INT_SCALE '1'
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/* timeout for the ping packets.*/
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#define DRBD_PING_TIMEO_MIN 1
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#define DRBD_PING_TIMEO_MAX 300
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#define DRBD_PING_TIMEO_DEF 5
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#define DRBD_PING_TIMEO_SCALE '1'
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/* max number of write requests between write barriers */
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#define DRBD_MAX_EPOCH_SIZE_MIN 1
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#define DRBD_MAX_EPOCH_SIZE_MAX 20000
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#define DRBD_MAX_EPOCH_SIZE_DEF 2048
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#define DRBD_MAX_EPOCH_SIZE_SCALE '1'
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/* I don't think that a tcp send buffer of more than 10M is useful */
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#define DRBD_SNDBUF_SIZE_MIN 0
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#define DRBD_SNDBUF_SIZE_MAX (10<<20)
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#define DRBD_SNDBUF_SIZE_DEF 0
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#define DRBD_SNDBUF_SIZE_SCALE '1'
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#define DRBD_RCVBUF_SIZE_MIN 0
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#define DRBD_RCVBUF_SIZE_MAX (10<<20)
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#define DRBD_RCVBUF_SIZE_DEF 0
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#define DRBD_RCVBUF_SIZE_SCALE '1'
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/* @4k PageSize -> 128kB - 512MB */
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#define DRBD_MAX_BUFFERS_MIN 32
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#define DRBD_MAX_BUFFERS_MAX 131072
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#define DRBD_MAX_BUFFERS_DEF 2048
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#define DRBD_MAX_BUFFERS_SCALE '1'
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/* @4k PageSize -> 4kB - 512MB */
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#define DRBD_UNPLUG_WATERMARK_MIN 1
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#define DRBD_UNPLUG_WATERMARK_MAX 131072
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#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
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#define DRBD_UNPLUG_WATERMARK_SCALE '1'
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/* 0 is disabled.
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* 200 should be more than enough even for very short timeouts */
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#define DRBD_KO_COUNT_MIN 0
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#define DRBD_KO_COUNT_MAX 200
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#define DRBD_KO_COUNT_DEF 7
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#define DRBD_KO_COUNT_SCALE '1'
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/* } */
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/* syncer { */
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/* FIXME allow rate to be zero? */
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#define DRBD_RESYNC_RATE_MIN 1
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/* channel bonding 10 GbE, or other hardware */
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#define DRBD_RESYNC_RATE_MAX (4 << 20)
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#define DRBD_RESYNC_RATE_DEF 250
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#define DRBD_RESYNC_RATE_SCALE 'k' /* kilobytes */
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#define DRBD_AL_EXTENTS_MIN 67
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/* we use u16 as "slot number", (u16)~0 is "FREE".
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* If you use >= 292 kB on-disk ring buffer,
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* this is the maximum you can use: */
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#define DRBD_AL_EXTENTS_MAX 0xfffe
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#define DRBD_AL_EXTENTS_DEF 1237
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#define DRBD_AL_EXTENTS_SCALE '1'
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#define DRBD_MINOR_NUMBER_MIN -1
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#define DRBD_MINOR_NUMBER_MAX ((1 << 20) - 1)
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#define DRBD_MINOR_NUMBER_DEF -1
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#define DRBD_MINOR_NUMBER_SCALE '1'
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/* } */
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/* drbdsetup XY resize -d Z
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* you are free to reduce the device size to nothing, if you want to.
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* the upper limit with 64bit kernel, enough ram and flexible meta data
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* is 1 PiB, currently. */
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/* DRBD_MAX_SECTORS */
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#define DRBD_DISK_SIZE_MIN 0
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#define DRBD_DISK_SIZE_MAX (1 * (2LLU << 40))
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#define DRBD_DISK_SIZE_DEF 0 /* = disabled = no user size... */
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#define DRBD_DISK_SIZE_SCALE 's' /* sectors */
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#define DRBD_ON_IO_ERROR_DEF EP_DETACH
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#define DRBD_FENCING_DEF FP_DONT_CARE
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#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
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#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
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#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
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#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
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#define DRBD_ON_NO_DATA_DEF OND_IO_ERROR
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#define DRBD_ON_CONGESTION_DEF OC_BLOCK
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#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL
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#define DRBD_MAX_BIO_BVECS_MIN 0
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#define DRBD_MAX_BIO_BVECS_MAX 128
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#define DRBD_MAX_BIO_BVECS_DEF 0
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#define DRBD_MAX_BIO_BVECS_SCALE '1'
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#define DRBD_C_PLAN_AHEAD_MIN 0
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#define DRBD_C_PLAN_AHEAD_MAX 300
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#define DRBD_C_PLAN_AHEAD_DEF 20
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#define DRBD_C_PLAN_AHEAD_SCALE '1'
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#define DRBD_C_DELAY_TARGET_MIN 1
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#define DRBD_C_DELAY_TARGET_MAX 100
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#define DRBD_C_DELAY_TARGET_DEF 10
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#define DRBD_C_DELAY_TARGET_SCALE '1'
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#define DRBD_C_FILL_TARGET_MIN 0
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#define DRBD_C_FILL_TARGET_MAX (1<<20) /* 500MByte in sec */
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#define DRBD_C_FILL_TARGET_DEF 100 /* Try to place 50KiB in socket send buffer during resync */
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#define DRBD_C_FILL_TARGET_SCALE 's' /* sectors */
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#define DRBD_C_MAX_RATE_MIN 250
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#define DRBD_C_MAX_RATE_MAX (4 << 20)
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#define DRBD_C_MAX_RATE_DEF 102400
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#define DRBD_C_MAX_RATE_SCALE 'k' /* kilobytes */
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#define DRBD_C_MIN_RATE_MIN 0
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#define DRBD_C_MIN_RATE_MAX (4 << 20)
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#define DRBD_C_MIN_RATE_DEF 250
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#define DRBD_C_MIN_RATE_SCALE 'k' /* kilobytes */
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#define DRBD_CONG_FILL_MIN 0
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#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
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#define DRBD_CONG_FILL_DEF 0
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#define DRBD_CONG_FILL_SCALE 's' /* sectors */
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#define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN
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#define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX
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#define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF
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#define DRBD_CONG_EXTENTS_SCALE DRBD_AL_EXTENTS_SCALE
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#define DRBD_PROTOCOL_DEF DRBD_PROT_C
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#define DRBD_DISK_BARRIER_DEF 0
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#define DRBD_DISK_FLUSHES_DEF 1
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#define DRBD_DISK_DRAIN_DEF 1
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#define DRBD_MD_FLUSHES_DEF 1
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#define DRBD_TCP_CORK_DEF 1
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#define DRBD_AL_UPDATES_DEF 1
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/* We used to ignore the discard_zeroes_data setting.
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* To not change established (and expected) behaviour,
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* by default assume that, for discard_zeroes_data=0,
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* we can make that an effective discard_zeroes_data=1,
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* if we only explicitly zero-out unaligned partial chunks. */
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#define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1
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/* Some backends pretend to support WRITE SAME,
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* but fail such requests when they are actually submitted.
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* This is to tell DRBD to not even try. */
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#define DRBD_DISABLE_WRITE_SAME_DEF 0
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#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0
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#define DRBD_ALWAYS_ASBP_DEF 0
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#define DRBD_USE_RLE_DEF 1
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#define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0
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#define DRBD_AL_STRIPES_MIN 1
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#define DRBD_AL_STRIPES_MAX 1024
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#define DRBD_AL_STRIPES_DEF 1
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#define DRBD_AL_STRIPES_SCALE '1'
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#define DRBD_AL_STRIPE_SIZE_MIN 4
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#define DRBD_AL_STRIPE_SIZE_MAX 16777216
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#define DRBD_AL_STRIPE_SIZE_DEF 32
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#define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */
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#define DRBD_SOCKET_CHECK_TIMEO_MIN 0
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#define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
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#define DRBD_SOCKET_CHECK_TIMEO_DEF 0
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#define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'
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#define DRBD_RS_DISCARD_GRANULARITY_MIN 0
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#define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */
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#define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */
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#define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */
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#endif
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