[ale] Xen Server adding a virtual disk to a VM

[Scott Plante]

Thanks Ed! Of course dmesg. I feel a bit silly because I know about dmesg but completely blanked I guess. The cat of /proc/partitions is a good idea too, except like with the ls /dev/xvd*, I should do it before I add the disk so I can see what's different after. 


I was hoping the Xen software would tell me but I guess being OS independent it doesn't get to that level, even when the xen-tools are installed inside the VM. It's kind of like I wish Xen would tell me the IP address a VM picks up after I start it, but again, it's too OS specific I suppose. 

Scott 

----- Original Message -----

From: "Ed Cashin" <ecashin at noserose.net> 
To: "Atlanta Linux Enthusiasts" <ale at ale.org> 
Sent: Thursday, October 13, 2016 4:32:25 PM 
Subject: Re: [ale] Xen Server adding a virtual disk to a VM 


In addition to Allen Beddingfield's suggestion, if you want to ask the kernel itself, you can do, 


cat /proc/partitions 


... to see all the disks and their partitions, and then, 


dmesg | less 


... to show what the kernel logged to the console about the disks listed in /proc/partitions. These techniques are helpful when commands are absent or minimal. Kernel-provided information changes in structure less frequently than command-provided information as well. 




On Thu, Oct 13, 2016 at 4:09 PM, Scott Plante < splante at insightsys.com > wrote: 




Hi, I actually know how to add a virtual disk to a VM, but once it's added, how are you supposed to know the device name so you can partition, create a filesystem, and mount it? 


I usually do this guessing-game where I do "ls /dev/xvd*" and "mount|grep xvd" and try to find what's missing, but this doesn't seem like the best way. Can you find out somehow from the xe command? 


Scott 



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