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XBD(4) NetBSD/xen Kernel Interfaces Manual XBD(4)
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Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
xbd -- Xen frontend paravirtualized block device interface
xbd* at xenbus?
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 cre-
ation 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.
xbd%d: using event channel %d Specifies the event channel used by this
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 opera-
tion. This can be problematic for file system operations that require
cache sync to avoid data loss or corruption.
xbdback(4), xenbus(4), dkctl(8)
The xbd driver first appeared in NetBSD 3.0.
The xbd driver was written by Manuel Bouyer <bouyer@NetBSD.org>.
NetBSD 9.0 January 8, 2011 NetBSD 9.0