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NetBSD 6.1.5 - man page for xbdback (netbsd section 4)

XBDBACK(4)			   BSD Kernel Interfaces Manual 		       XBDBACK(4)

     xbdback -- Xen backend paravirtualized block device interface

     pseudo-device xbdback

     The xbdback interface forms the backend part of the paravirtualized drivers used by Xen
     domains to offer a block device interface, similar to a hard disk.  xbdback interfaces are
     backed either by a physical device directly, or an image file mounted through vnd(4).

     All xbdback interfaces follow the ``xbdbackXiY'' naming convention, where 'X' represents the
     guest domain identifier, and 'Y' an arbitrary identifier.	This identifier is usually asso-
     ciated to the device node as seen by the guest using major(3) and minor(3) numbers.  For
     example, identifier ``769'' (0x301) means major 3 and minor 1, identified as ``hda1'' under
     Linux convention.	For NetBSD, the guest device name specified in the guest configuration
     file does not matter, and can be chosen arbitrarily.

     A xbdback interface will appear as a xbd(4) block device inside a NetBSD guest domain.  In
     the XenStore, xbd and xbdback are identified by ``vbd'' (virtual block device) entries.

     xbd backend: attach device %s (size %d) for domain %d  Gives the device used as xbdback
     interface for the given guest domain, and its size, in bytes.

     xbd backend 0x%x for domain %d using event channel %d, protocol %s  Gives the backend iden-
     tifier, guest domain ID, event channel ID, and protocol used for block level communication.

     xbdback %s: can't VOP_OPEN device 0x%x: %d  When this message appears in the system message
     buffer with error 16 (EBUSY), the device is likely to be already mounted.	It must be
     unmounted first, as the system will refuse to open it a second time.

     vnd(4), xbd(4), xenbus(4)

     The xbdback driver first appeared in NetBSD 4.0.

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

BSD					   June 7, 2011 				      BSD

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