Andy Smith
2006-Jan-26 14:34 UTC
[Xen-users] Changing the size of an exported block device
Hello, Say I have an LVM LV exported to a running domU, and I want to increase the size of that LV. I can lvextend from dom0, and I can use whatever filesystem tools I like to extend that fs in dom0 if I were to mount it. However I understand that if the domU were to try to write beyond the end of the block device''s limits as it knew when it was exported then it will get very upset. What is the correct procedure in this circumstance? Is it possible to withdraw the block device from the domU and then export it again so that it sees it as new? Thanks, Andy _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Kris Buytaert
2006-Jan-26 15:48 UTC
Re: [Xen-users] Changing the size of an exported block device
On Thu, 2006-01-26 at 14:34 +0000, Andy Smith wrote:> Hello, > > Say I have an LVM LV exported to a running domU, and I want to > increase the size of that LV. I can lvextend from dom0, and I can > use whatever filesystem tools I like to extend that fs in dom0 if I > were to mount it. > > However I understand that if the domU were to try to write beyond > the end of the block device''s limits as it knew when it was exported > then it will get very upset. > > What is the correct procedure in this circumstance? Is it possible > to withdraw the block device from the domU and then export it again > so that it sees it as new? >Assuming that is not your root filesystem you want to withraw from a domU The commmands below should solve your problem. Virtual Device Commands: block-attach <DomId> <BackDev> <FrontDev> <Mode> [BackDomId] Create a new virtual block device block-detach <DomId> <DevId> Destroy a domain''s virtual block device, where <DevId> may either be the device ID or the device name as mounted in the guest block-list <DomId> List virtual block devices for a domain> Thanks, > Andy > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users-- Kris Buytaert <mlkb@x-tend.be> _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users