| /* 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 |