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Now that the on-disk activity-log ring buffer size is adjustable, the maximum active set can become larger, and is now limited by the use of 16bit "labels". This increases the maximum working set from 6433 to 65534 extents, each of which covers an area of 4MiB. Which means that if you use the maximum, you'd have to resync more than 250 GiB after an unclean Primary shutdown. With capable backend storage and replication links, this is entirely feasible. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
219 lines
6.6 KiB
C
219 lines
6.6 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_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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/* less than 7 would hit performance unnecessarily. */
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#define DRBD_AL_EXTENTS_MIN 7
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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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#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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#endif
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