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Edit File: drbd_limits.h

/* SPDX-License-Identifier: GPL-2.0 */ /* 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 */ #define DRBD_AL_EXTENTS_MIN 67 /* we use u16 as "slot number", (u16)~0 is "FREE". * If you use >= 292 kB on-disk ring buffer, * this is the maximum you can use: */ #define DRBD_AL_EXTENTS_MAX 0xfffe #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 /* We used to ignore the discard_zeroes_data setting. * To not change established (and expected) behaviour, * by default assume that, for discard_zeroes_data=0, * we can make that an effective discard_zeroes_data=1, * if we only explicitly zero-out unaligned partial chunks. */ #define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1 /* Some backends pretend to support WRITE SAME, * but fail such requests when they are actually submitted. * This is to tell DRBD to not even try. */ #define DRBD_DISABLE_WRITE_SAME_DEF 0 #define DRBD_ALLOW_TWO_PRIMARIES_DEF 0 #define DRBD_ALWAYS_ASBP_DEF 0 #define DRBD_USE_RLE_DEF 1 #define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0 #define DRBD_AL_STRIPES_MIN 1 #define DRBD_AL_STRIPES_MAX 1024 #define DRBD_AL_STRIPES_DEF 1 #define DRBD_AL_STRIPES_SCALE '1' #define DRBD_AL_STRIPE_SIZE_MIN 4 #define DRBD_AL_STRIPE_SIZE_MAX 16777216 #define DRBD_AL_STRIPE_SIZE_DEF 32 #define DRBD_AL_STRIPE_SIZE_SCALE 'k' /* kilobytes */ #define DRBD_SOCKET_CHECK_TIMEO_MIN 0 #define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX #define DRBD_SOCKET_CHECK_TIMEO_DEF 0 #define DRBD_SOCKET_CHECK_TIMEO_SCALE '1' #define DRBD_RS_DISCARD_GRANULARITY_MIN 0 #define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */ #define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */ #define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */ #endif