Xen project Mailing List

Re: [Xen-users] Underlying device resized

To: "Petersson, Mats" <Mats.Petersson@xxxxxxx>

From: Jayson Vantuyl <jvantuyl@xxxxxxxxxxxxxx>

Date: Tue, 12 Jun 2007 15:14:22 -0500

Cc: Igor Chubin <igor@xxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx

Delivery-date: Tue, 12 Jun 2007 13:13:43 -0700

List-id: Xen user discussion <xen-users.lists.xensource.com>

For PV, xm block-configure supposedly used to do this.

I need to do this all the time but I've never been able to get things to work with any recent Xen.

I have on average 120 to 150 LVM volumes per node on a cluster of 16 nodes (we now have multiple clusters too). Having to reboot a VM just to pick this up is actually quite a pain. Does anyone know how to make this work?

On Jun 12, 2007, at 9:52 AM, Petersson, Mats wrote:

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
Igor Chubin
Sent: 12 June 2007 15:51
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Underlying device resized

Hello, all!

Please, tell me, how can I say domU
that its underlying disk device (e.g. LVM logical volume)
has changed its size?

I don't want reboot host and reattach the device.

Well, you probably have to, unless you can otherwise make it think the
device has "changed media" or "hotplugged". Since most OS's don't really
expect hard-disks to change size without some sort of hardware event
happening (e.g. hotplug event), the guest OS isn't going to "check" to
see if the disk changed size without some sort of "trigger".

If it's a PV domain, you may be able to just "xm block-detach" and "xm
block-attach", but for HVM devices, I'm not sure that works without PV
drivers to help out (and I don't think such drivers are available).

--
Mats

I do lvresize in the dom0 and after that want to do ext2online
in the domU.
I can see that disk is not known to be resized in domU by
looking at the domU /proc/partitions file.

Thank you.

--
WBR, i.m.chubin

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Jayson Vantuyl

Systems Architect

Engine Yard

jvantuyl@xxxxxxxxxxxxxx

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