220 lines
6.6 KiB
C
220 lines
6.6 KiB
C
/*
|
|
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
|