Commit b411b363 authored by Philipp Reisner's avatar Philipp Reisner Committed by Jens Axboe
Browse files

The DRBD driver 



Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent 1a35e0f6

Documentation/blockdev/drbd/DRBD-8.3-data-packets.svg

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Documentation/blockdev/drbd/DRBD-data-packets.svg

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File added.

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Documentation/blockdev/drbd/README.txt

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Description



  DRBD is a shared-nothing, synchronously replicated block device. It

  is designed to serve as a building block for high availability

  clusters and in this context, is a "drop-in" replacement for shared

  storage. Simplistically, you could see it as a network RAID 1.



  Please visit http://www.drbd.org to find out more.



The here included files are intended to help understand the implementation



DRBD-8.3-data-packets.svg, DRBD-data-packets.svg  

  relates some functions, and write packets.



conn-states-8.dot, disk-states-8.dot, node-states-8.dot

  The sub graphs of DRBD's state transitions

Documentation/blockdev/drbd/conn-states-8.dot

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digraph conn_states {

	StandAllone  -> WFConnection   [ label = "ioctl_set_net()" ]

	WFConnection -> Unconnected    [ label = "unable to bind()" ]

	WFConnection -> WFReportParams [ label = "in connect() after accept" ]

	WFReportParams -> StandAllone  [ label = "checks in receive_param()" ]

	WFReportParams -> Connected    [ label = "in receive_param()" ]

	WFReportParams -> WFBitMapS    [ label = "sync_handshake()" ]

	WFReportParams -> WFBitMapT    [ label = "sync_handshake()" ]

	WFBitMapS -> SyncSource        [ label = "receive_bitmap()" ]

	WFBitMapT -> SyncTarget        [ label = "receive_bitmap()" ]

	SyncSource -> Connected

	SyncTarget -> Connected

	SyncSource -> PausedSyncS

	SyncTarget -> PausedSyncT

	PausedSyncS -> SyncSource

	PausedSyncT -> SyncTarget

	Connected   -> WFConnection    [ label = "* on network error" ]

}

Documentation/blockdev/drbd/disk-states-8.dot

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digraph disk_states {

	Diskless -> Inconsistent       [ label = "ioctl_set_disk()" ]

	Diskless -> Consistent         [ label = "ioctl_set_disk()" ]

	Diskless -> Outdated           [ label = "ioctl_set_disk()" ]

	Consistent -> Outdated         [ label = "receive_param()" ]

	Consistent -> UpToDate         [ label = "receive_param()" ]

	Consistent -> Inconsistent     [ label = "start resync" ]

	Outdated   -> Inconsistent     [ label = "start resync" ]

	UpToDate   -> Inconsistent     [ label = "ioctl_replicate" ]

	Inconsistent -> UpToDate       [ label = "resync completed" ]

	Consistent -> Failed           [ label = "io completion error" ]

	Outdated   -> Failed           [ label = "io completion error" ]

	UpToDate   -> Failed           [ label = "io completion error" ]

	Inconsistent -> Failed         [ label = "io completion error" ]

	Failed -> Diskless             [ label = "sending notify to peer" ]

}