xm block-attach Post: 302510664

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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

04-04-2011

Registered User

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?

majid.merkava

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