| /* |
| 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 */ |
| |
| /* less than 7 would hit performance unnecessarily. |
| * 919 slots context information per transaction, |
| * 32k activity log, 4k transaction size, |
| * one transaction in flight: |
| * 919 * 7 = 6433 */ |
| #define DRBD_AL_EXTENTS_MIN 7 |
| #define DRBD_AL_EXTENTS_MAX 6433 |
| #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 |
| |
| #define DRBD_ALLOW_TWO_PRIMARIES_DEF 0 |
| #define DRBD_ALWAYS_ASBP_DEF 0 |
| #define DRBD_USE_RLE_DEF 1 |
| |
| #endif |