0c8e36d9b8
The 8 byte header finally becomes too small. With the protocol 100 header we have 16 bit for the volume number, proper 32 bit for the data length, and 32 bit for further extensions in the future. Previous versions of drbd are using version 80 headers for all packets short enough for protocol 80. They support both header versions in worker context, but only version 80 headers in asynchronous context. For backwards compatibility, continue to use version 80 headers for short packets before protocol version 100. From protocol version 100 on, use the same header version for all packets. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
175 lines
5 KiB
C
175 lines
5 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 256
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#define DRBD_MINOR_COUNT_DEF 32
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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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/* 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 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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/* 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 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_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 unnecessarily.
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* 919 slots context information per transaction,
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* 32k activity log, 4k transaction size,
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* one transaction in flight:
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* 919 * 7 = 6433 */
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#define DRBD_AL_EXTENTS_MIN 7
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#define DRBD_AL_EXTENTS_MAX 6433
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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 1 PiB, 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 (1 * (2LLU << 40))
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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_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_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_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 0 /* RS rate controller disabled by default */
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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_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 0 /* By default disabled -> controlled by delay_target */
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#define DRBD_C_MAX_RATE_MIN 250 /* kByte/sec */
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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_MIN_RATE_MIN 0 /* kByte/sec */
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#define DRBD_C_MIN_RATE_MAX (4 << 20)
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#define DRBD_C_MIN_RATE_DEF 4096
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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_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_PROTOCOL_DEF DRBD_PROT_C
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#undef RANGE
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#endif
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