138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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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_DIALOG_REFRESH_MIN 0
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#define DRBD_DIALOG_REFRESH_MAX 600
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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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/* 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_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_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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/* }*/
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/* net { */
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/* timeout, unit centi seconds
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* more than one minute timeout is not usefull */
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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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/* 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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/* 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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/* timeout for the ping packets.*/
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#define DRBD_PING_TIMEO_MIN 1
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#define DRBD_PING_TIMEO_MAX 100
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#define DRBD_PING_TIMEO_DEF 5
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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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/* I don't think that a tcp send buffer of more than 10M is usefull */
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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_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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/* @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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/* @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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/* 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 0
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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_RATE_MIN 1
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/* channel bonding 10 GbE, or other hardware */
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#define DRBD_RATE_MAX (4 << 20)
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#define DRBD_RATE_DEF 250 /* kb/second */
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/* less than 7 would hit performance unneccessarily.
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* 3833 is the largest prime that still does fit
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* into 64 sectors of activity log */
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#define DRBD_AL_EXTENTS_MIN 7
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#define DRBD_AL_EXTENTS_MAX 3833
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#define DRBD_AL_EXTENTS_DEF 127
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#define DRBD_AFTER_MIN -1
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#define DRBD_AFTER_MAX 255
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#define DRBD_AFTER_DEF -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 16 TB, currently. */
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/* DRBD_MAX_SECTORS */
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#define DRBD_DISK_SIZE_SECT_MIN 0
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#define DRBD_DISK_SIZE_SECT_MAX (16 * (2LLU << 30))
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#define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */
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#define DRBD_ON_IO_ERROR_DEF EP_PASS_ON
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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_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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#undef RANGE
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#endif
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