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Full Discussion: xm block-attach
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
Old 04-08-2011
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.
These 2 Users Gave Thanks to pileofrogs For This Post:
majid.merkava nirmalsudan
 

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LEARN ABOUT DEBIAN

readdvd

readdvd(1)							    readdvd 1.0 							readdvd(1)

NAME

       readdvd - is creating an image of your source dvd media or medias even if it has / they have corrupted blocks

SYNOPSIS

       readdvd [-l] [-h]
       readdvd -d DEVICE1 [-d DEVICE2] [-d ...] -o file.iso [-s #] [-v] [-vv]

DESCRIPTION

       readdvd reads even a corrupted dvd and writes the the result into a new image file on your harddisk.

DEVICE

       can be an IDE, SCSI, SATA, USB or FireWire connected optical drive. Not all SATA controller support all Plextor features.

       Linux:
       /dev/hdX: IDE device
       /dev/scdX: Linux 2.4: SATA, SCSI, USB device, or IDE device via ide-scsi emulation
       /dev/srX: Linux 2.6: IDE device via new ATA layer, SCSI or USB device

       OpenBSD/NetBSD:
       /dev/rcdX

       FreeBSD:
       /dev/cd: SCSI device
       /dev/acd: ATA device

       MacOS X:
       /dev/disk:

       win32:
       C:,D:,E:, ... X:,Y:,Z:

OPTIONS

       -l	 scan busses for all available CD and DVD devices

       -h	 help shows available options.

       -o file.iso
		 write data to imagefile named file.iso

       -s #	 read source media with selected speed

       -v	 use verbose mode

       -vv	 use extended verbose mode

INTERACTIVE MODUS

       q    stop reading media and exit

       w    save sector map which is currently read and continue with the next one

EXAMPLES

       readdvd -d /dev/sr0 -o filename.iso -s 8 -v
	    create an image filename.bin of inserted media in device /dev/sr0 with read speed 8 in verbose mode.

       please report man page improvements to T.Maguin@web.de

Gennady ShultZ Kozlov						  10. April, 2009							readdvd(1)
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