adding more than one disk.

adding more than one disk.

[Ronald G. Minnich]

If I set up my xen file as follows:
disk = [ 'phy:loop0,loop0,w', 'phy:loop1,loop1,w']

I realize I should USTL but it seemed to me I should expect blkif changed 
messages for each vbd. I'm only getting the messages once. 

i.e. I see this:
===========> blkif_status_change to 1
===========> blkif_status_change to 2
===========> evtchn for blkif is 3
====> enable disk interrupt
=========> controller connected

For the first disk, and that's it. Shouldn't I see two of these sets of 
messages, one for each disk? 

Is my expectation wrong or is something else going on that I missed?

thanks

ron
p.s. I actually now have two plan 9/xen users out there ... 2 more than I 
had a month ago. So a month ago there was one, now 3 ... at this rate we 
should take over the planet in no time.


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Re: adding more than one disk.

[Anthony Liguori]

Ronald G. Minnich wrote:

>If I set up my xen file as follows:
>disk = [ 'phy:loop0,loop0,w', 'phy:loop1,loop1,w']
>
>I realize I should USTL but it seemed to me I should expect blkif changed 
>messages for each vbd. I'm only getting the messages once. 
>
>i.e. I see this:
>===========> blkif_status_change to 1
>===========> blkif_status_change to 2
>===========> evtchn for blkif is 3
>====> enable disk interrupt
>=========> controller connected
>  
>
>For the first disk, and that's it. Shouldn't I see two of these sets of 
>messages, one for each disk? 
>  
>
Unliked netif devices, there is only one blkif device (that is one 
blk_handle) for all of your vbds within a domain.  There is also only 
one event channel (again, this is different than netif devices).  I'm 
not sure if there are scenarios where you would have multiple blkif 
devices...

>Is my expectation wrong or is something else going on that I missed?
>  
>
Is there some sort of problem with Plan9?  What exact is happening?  The 
above statements are for Linux.  I don't know if things are somehow 
different under Plan9..

>thanks
>
>ron
>p.s. I actually now have two plan 9/xen users out there ... 2 more than I 
>had a month ago. So a month ago there was one, now 3 ... at this rate we 
>should take over the planet in no time.
>  
>
Is there an image of Plan9 somewhere?  I'm currently rebuilding my main 
machine and would love to throw a copy of it in the mix and be #4 :-)

Regards,
Anthony Liguori


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Re: adding more than one disk.

[Mark Williamson]

> Unliked netif devices, there is only one blkif device (that is one
> blk_handle) for all of your vbds within a domain.  There is also only
> one event channel (again, this is different than netif devices).  I'm
> not sure if there are scenarios where you would have multiple blkif
> devices...

You'd use multiple block interfaces to use devices provided by multiple 
backend domains.  i.e. it doesn't happen in typical setups

Cheers,
Mark

> >Is my expectation wrong or is something else going on that I missed?
>
> Is there some sort of problem with Plan9?  What exact is happening?  The
> above statements are for Linux.  I don't know if things are somehow
> different under Plan9..
>
> >thanks
> >
> >ron
> >p.s. I actually now have two plan 9/xen users out there ... 2 more than I
> >had a month ago. So a month ago there was one, now 3 ... at this rate we
> >should take over the planet in no time.
>
> Is there an image of Plan9 somewhere?  I'm currently rebuilding my main
> machine and would love to throw a copy of it in the mix and be #4 :-)
>
> Regards,
> Anthony Liguori
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
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> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel


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Re: adding more than one disk.

[Ronald G. Minnich]

On Wed, 16 Feb 2005, Anthony Liguori wrote:

> Unliked netif devices, there is only one blkif device (that is one blk_handle)
> for all of your vbds within a domain.  There is also only one event channel
> (again, this is different than netif devices).  I'm not sure if there are
> scenarios where you would have multiple blkif devices...

ok, you're right. Geez, I go away from this for a few weeks and forget 
everything :-)


> Is there some sort of problem with Plan9?  What exact is happening?  
> The above statements are for Linux.  I don't know if things are somehow
> different under Plan9..

no, I forgot that there is only one event channel and one controller. I 
have to learn how to look for those other disks :-)

> Is there an image of Plan9 somewhere?  I'm currently rebuilding my main
> machine and would love to throw a copy of it in the mix and be #4 :-)

I can point you at the plan 9 server, but if you're not running plan 9 
that is of dubious value :-)

I'll try to put it on a web page somewhere soon.

ron


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