XBD(4) FreeBSD 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 <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 January 8, 2011 FreeBSD 14.1-RELEASE-p8