Hi, Is there a way to make a PV xen guest aware of a size change of the host disk? In my case I'm talking about a Centos 5.3 host using logical volumes as storage for the guests and the guests running Centos 5.3 and LVM too. What I'm trying to accomplish is to resize the logical volume for the guest by adding a few gigs and then make the guest see this change without requiring a reboot. Is this possible maybe using some kind of bus rescan in the guest?
Regards, Dennis
On Mon, Sep 28, 2009 at 6:43 AM, Dennis J. dennisml@conversis.de wrote:
Hi, Is there a way to make a PV xen guest aware of a size change of the host disk? In my case I'm talking about a Centos 5.3 host using logical volumes as storage for the guests and the guests running Centos 5.3 and LVM too. What I'm trying to accomplish is to resize the logical volume for the guest by adding a few gigs and then make the guest see this change without requiring a reboot. Is this possible maybe using some kind of bus rescan in the guest?
Regards, Dennis
Last time I checked this wasn't supported.
Grant McWilliams
Some people, when confronted with a problem, think "I know, I'll use Windows." Now they have two problems.
Dennis J. wrote:
Hi, Is there a way to make a PV xen guest aware of a size change of the host disk? In my case I'm talking about a Centos 5.3 host using logical volumes as storage for the guests and the guests running Centos 5.3 and LVM too. What I'm trying to accomplish is to resize the logical volume for the guest by adding a few gigs and then make the guest see this change without requiring a reboot. Is this possible maybe using some kind of bus rescan in the guest?
No, it's not possible unfortunately. On a traditionnal SCSI bus you can rescan the whole bus to see newer/added devices or just the device to see newer size, but not on a Xen domU . At least that's what i found when i blogged about that . See that thread on the Xen list : http://lists.xensource.com/archives/html/xen-users/2008-04/msg00246.html
So what i do since then is to use lvm in the domU as well and add a new xvd block device to the domU (aka a new LV on the dom0) and then the traditionnal pvcreate/vgextend/lvextend. Working correctly for all my domU's ..
On 28/09/09 17:37, Fabian Arrotin wrote:
So what i do since then is to use lvm in the domU as well and add a new xvd block device to the domU (aka a new LV on the dom0) and then the traditionnal pvcreate/vgextend/lvextend. Working correctly for all my domU's ..
how are you able to add a new disk without a reboot ? or is that something that works with the xenblock drivers ?
- KB
----- "Karanbir Singh" mail-lists@karan.org wrote:
how are you able to add a new disk without a reboot ? or is that something that works with the xenblock drivers ?
xm block-attach
On 28/09/09 18:08, Christopher G. Stach II wrote:
----- "Karanbir Singh"mail-lists@karan.org wrote:
how are you able to add a new disk without a reboot ? or is that something that works with the xenblock drivers ?
xm block-attach
nice!
- KB
Karanbir Singh wrote:
On 28/09/09 17:37, Fabian Arrotin wrote:
So what i do since then is to use lvm in the domU as well and add a new xvd block device to the domU (aka a new LV on the dom0) and then the traditionnal pvcreate/vgextend/lvextend. Working correctly for all my domU's ..
how are you able to add a new disk without a reboot ? or is that something that works with the xenblock drivers ?
Yes, i've only PV domU's ;-)
virsh attach-disk /path/to/lv/on/the/domO xvd[letter as it appears on the domU]
On 09/28/2009 06:37 PM, Fabian Arrotin wrote:
Dennis J. wrote:
Hi, Is there a way to make a PV xen guest aware of a size change of the host disk? In my case I'm talking about a Centos 5.3 host using logical volumes as storage for the guests and the guests running Centos 5.3 and LVM too. What I'm trying to accomplish is to resize the logical volume for the guest by adding a few gigs and then make the guest see this change without requiring a reboot. Is this possible maybe using some kind of bus rescan in the guest?
No, it's not possible unfortunately. On a traditionnal SCSI bus you can rescan the whole bus to see newer/added devices or just the device to see newer size, but not on a Xen domU . At least that's what i found when i blogged about that . See that thread on the Xen list : http://lists.xensource.com/archives/html/xen-users/2008-04/msg00246.html
So what i do since then is to use lvm in the domU as well and add a new xvd block device to the domU (aka a new LV on the dom0) and then the traditionnal pvcreate/vgextend/lvextend. Working correctly for all my domU's ..
I just tested this and it works great, thanks!
Regards, Dennis
-
Christopher G. Stach II -
Dennis J. -
Fabian Arrotin -
Grant McWilliams -
Karanbir Singh