xm block-attach Post: 302512103

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Homework and Emergencies Emergency UNIX and Linux Support xm block-attach Post 302512103 by pileofrogs on Friday 8th of April 2011 11:27:55 AM

04-08-2011

Registered User

Short Answer:

Yup! That 'w' means read/write. You might have read only drives, such as a CD. You can mount read-only drives on multiple DomUs and you can't do that (without major craziness or a network/cluster filesystem) with a read/write drive.

Long Answer:

Typing "xm block-attach" into google, got me this man page

xm(1): Xen management user interface - Linux man page

with this section on block-attach

block-attach domain-id be-dev fe-dev mode [bedomain-id]
Create a new virtual block device. This will trigger a hotplug event for the guest.

OPTIONS
domain-id
The domain id of the guest domain that the device will be attached to.
be-dev
The device in the backend domain (usually domain 0) to be exported. This can be specified as a physical partition (phy:sda7) or as a file mounted as loopback (file://path/to/loop.iso).
fe-dev
How the device should be presented to the guest domain. It can be specified as either a symbolic name, such as /dev/hdc, for common devices, or by device id, such as 0x1400 (/dev/hdc device id in hex).
mode
The access mode for the device from the guest domain. Supported modes are w (read/write) or r (read-only).
bedomain-id
The back end domain hosting the device. This defaults to domain 0.
EXAMPLES
Mount an ISO as a Disk
xm block-attach guestdomain file://path/to/dsl-2.0RC2.iso /dev/hdc ro

This will mount the dsl iso as /dev/hdc in the guestdomain as a read only device. This will probably not be detected as a cdrom by the guest, but mounting /dev/hdc manually will work.

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LEARN ABOUT NETBSD

xbdback

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

NAME

     xbdback -- Xen backend paravirtualized block device interface

SYNOPSIS

     pseudo-device xbdback

DESCRIPTION

     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 associated 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 spec-
     ified 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.

DIAGNOSTICS

     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 identifier, guest domain ID, event channel ID, and pro-
     tocol 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.

SEE ALSO

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

HISTORY

     The xbdback driver first appeared in NetBSD 4.0.

AUTHORS

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

BSD
								   June 7, 2011 							       BSD

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