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XBD(4)                  Kernel Interfaces Manual (Xen)                  XBD(4)

NAME
     xbd -- Xen frontend paravirtualized block device interface

SYNOPSIS
     xbd* at xenbus?

DESCRIPTION
     The xbd interface forms the frontend part of the paravirtualized drivers
     used by Xen guest domains to have a block device interface.

     From a guest point of view, xbd is similar to a hard disk, and can be
     treated in the very same way regarding partitioning, file systems
     creation and usage, and mounting.  By default, a NetBSD guest domain will
     assume that ``xbd0a'' serves as the root file system.

     When the host is NetBSD, the xbd interface is backed by a xbdback(4)
     interface.  In the XenStore, xbd and xbdback are identified by ``vbd''
     (virtual block device) entries.

DIAGNOSTICS
     xbd%d: using event channel %d  Specifies the event channel used by this
     xbd interface.

     xbd%d: %s MB, %d bytes/sect x %u sectors  Gives the total size of the xbd
     block device, its sector size and total number of sectors.

     xbd%d: WARNING: cache flush not supported by backend  The backend driver
     associated with this xbd device does not support cache flushing
     operation.  This can be problematic for file system operations that
     require cache sync to avoid data loss or corruption.

SEE ALSO
     xbdback(4), xenbus(4), dkctl(8)

HISTORY
     The xbd driver first appeared in NetBSD 3.0.

AUTHORS
     The xbd driver was written by Manuel Bouyer <bouyer@NetBSD.org>.

NetBSD 7.1.2                    January 8, 2011                   NetBSD 7.1.2