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Re: [Xen-users] which disks/block device does Xen use at the moment?

  • To: Tomasz Chmielewski <mangoo@xxxxxxxx>
  • From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
  • Date: Mon, 19 Nov 2007 16:11:51 +0000
  • Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 19 Nov 2007 08:10:44 -0800
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Tomasz Chmielewski wrote:
Nico Kadel-Garcia schrieb:
Tomasz Chmielewski wrote:
I'm sending it again, as the message sent on 16.11.2007 didn't get to the list.

Is there a way to guess which block devices / disk does Xen use at the moment?

I use Xen with iSCSI.
I connect to 50 iSCSI targets or more on each Xen server - and I get "virtual disks" ranging from /dev/sda to /dev/sdbl etc. - it's a lot.

Sometimes, I want to log out a given iSCSI connection (parameters changed on a target etc.) - but before I actually do it, I would like to know if that iSCSI drive is not used by Xen.

In other word - is there a way to check if Xen uses block device /dev/sda, /dev/sdu or /dev/sdbb etc.?

Well, what does "mount" say from the DomU

mount from domU would always say its "local" disk, that is, /dev/sda1 or such. And good luck if domU is Windows.
Well, yes. I'm sorry if I was unclear: if you have multiple partitions mounted for whatever reason, this gives you a set of references for what the "xm list --long" says is available to the domain.

and what does "xm list [DOMAIN] --long" say on the Dom0?

That's it, certainly I can grep through that output, thanks!
Happy to oblige.

Would be great if Xen registered some "holders" in /sys/block for a device it uses - like LVM or RAID does in /sys/block/<device>/holders/

Hmm. Interesting idea.

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