XBD(4) BSD/xen Kernel Interfaces Manual 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 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.
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>.
BSD January 8, 2011 BSD
Check Out this Related Man Page
XENBUS(4) BSD/xen Kernel Interfaces Manual XENBUS(4)NAME
xenbus -- Xen bus abstraction for paravirtualized drivers
SYNOPSIS
xenbus* at hypervisor?
DESCRIPTION
The xenbus interface offers an abstraction layer used for communications between domains. xenbus is mainly used by split paravirtualized
drivers, so backend and frontend devices can exchange configuration information, properties, and statistics.
xenbus is not used for data transfer (network frames, blocks, PCI commands, ...). This functionality is implemented by each paravirtualized
driver independently, typically via shared memory pages and an event channel that serves as a virtual interrupt, for signaling.
The xenbus abstraction offers guests the possibility to read and write information directly from and to XenStore, a centralized database
accessible to all domains. For this reason, it also has an event channel associated to it, so that domains can post messages to the XenStore
facility.
DIAGNOSTICS
xenbus0: using event channel %d The event channel associated to the xenbus interface, for communication with the XenStore database.
SEE ALSO pciback(4), xbd(4), xbdback(4), xennet(4), xpci(4), xvif(4)HISTORY
The xenbus driver first appeared in NetBSD 3.0.
AUTHORS
The xenbus driver was written by Manuel Bouyer <bouyer@NetBSD.org>.
BSD January 8, 2011 BSD
Hi All,
I am writing a block driver for a 2GB SD card where i get the total amount of data per request as follows:
struct request *req;
uint card_addr,total_bytes;
struct request_queue *rq = BlkDev->queue;
req = elv_next_request(rq);
..
..
card_addr = req->sector*512;... (1 Reply)
Hello Folks,
Anyone know about the support possibilities of Xenserver(open source) on CentOS6..?
As I Googled and read alot of forums, but no luck. I have tried the followings.
OS: CentOS6
Kernel: 2.6.32-71.29.1.el6.x86_64
Arch: x86_64
When tried to install XenServer from source.
Xen4.0 -... (1 Reply)
I have a guest LDOM running Solaris 10U11 on a Sun T4-1 host running Solaris 11.4. The host has a disk named bkpool that I'd like to share with the LDOM so both can read and write it. The host is hemlock, the guest is sol10.
root@hemlock:~# zpool list
NAME SIZE ALLOC FREE CAP DEDUP ... (3 Replies)