[Xen-users] question about disk = [ 'phy:/dev/vg1/vol1, sda, w!' ] construct

[Imre Oolberg <imre@xxxxxxxxxxx>]

Hallo!

The other day i browsed thru readings about Xen, esp.

http://www.virtuatopia.com/index.php/Adding_Disk%2C_CDROM_and_DVD_Devices_to_a_Running_Xen_domainU_Guest_System#An_Overview_of_xm_block-attach

and encountered an interesting construct about having multiple domU to 
have rw access to the same storage simultaneously like that
disk = [ 'phy:/dev/vg1/vol1,sda,w!' ]

Though xm man page or xm create --help_config does not mention it 
neither on Debian Etch (v 3.0) or on Ubuntu Hardy (v 3.2) it seems to 
work (i tried it very briefly under Ubuntu Hardy (8.0.4, latest stable, 
64 bit version).
Since i am interesting to try out Oracle RAC configuration it could be 
very handy to use Xen for that purpose. If anybody could give a comment 
or share experience about the status of that paticular 'w!' option, it 
would be very good! I.e. is it suitable also for production use etc.
Thanks and best regards,

Imre

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