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Full Discussion: xm block-attach
Homework and Emergencies Emergency UNIX and Linux Support xm block-attach Post 302510664 by majid.merkava on Monday 4th of April 2011 02:41:51 PM
Old 04-04-2011
xm block-attach

Hi guys.

I'm studding XEN virtualization with 'The Book Of XEN'. in page 46 it has a statement about how to use xm block-attach command that I don't understand.
here is the command:
Code:
xm block-attach 0 tap:aio:/opt/xen/anthony.img /dev/xvda1 w 0

and here is sentence:
Code:
we are attaching anthony.img read/write using tap:aio driver to /dev/xvda1 
in domain 0 using domain 0 to mediate access (because we tend to avoid using non-dom0 driver domains)

what exactly means? is the 'w' means read/write? why should we need it? i mean is there a read only image?
 

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img-window(n)															     img-window(n)

NAME
img-window - Img, Tk Windows (window) SYNOPSIS
package require Tk package require img::window ?1.3? image create photo ?name? ?options? DESCRIPTION
The package img::window is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its own, via package require img::window. Like all packages of Img it does not provide new commands, but extends the existing Tk command image. More specifically img::window extends Tk's photo image type. The name of the new format handler is window. This handler does not provide additional configuration options. This handler is special. Instead of reading or writing image data from a file or string it allows the embedding of a Tk widget into the photo image. In other words, it takes a snapshot of the contents of a Tk window. All of the above means that in a call like image create photo ?name? ?options? [1] Image data in window format (option -data) is detected automatically. Image data is considered to be in the window format if the value given to option -data is the name of an existing Tk window. Note that the standard option -file is not supported by this handler. [2] The format name window is recognized by the option -format. SEE ALSO
img-bmp, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun, img-tga, img-tiff, img- window, img-xbm, img-xpm KEYWORDS
image handling, tk, window COPYRIGHT
Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.com> Img 1.3 img-window(n)
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