[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Re: cLVM on Debian/Lenny
Jan Kalcic wrote: > Javier Guerra wrote: > > > > > > right. they manage very different things (cLVM gives you blockdevices, > > while OCFS gives you files); but Xen can use either one for the same > > purpose (storage for DomUs), and neither of them will prevent several nodes > > clashing each other when using the same 'thing' (file or blockdevice) at > > the same time. just like a non-cluster filesystem can't prevent two > > different processes from corrupting a datafile by writing at the same time. > > > > for that there are some scripts for HA (hearbeat2) that manage Xen > > instances as 'cluster resources', and make sure that each one is running on > > exactly one node. > > > > > > > That's very clear and you got it, HA. With Xen in HA, like any other > kind of resource, you can obviously start manually a domU from console > or virt-manager and so you are not sure it is running on one node only. > Of course, you don't manage clustered resources (usually services or > whatever) without hearbeat, otherwise you end up to face strange and > unpredictable behavior. What would be really useful here, is a kind of > lock which prevent a domU already running on a dom0 to be started on > another domU.I wrongly expected this was managed by cLVM and now which > everything is explained I see the reason why it cannot be done and I > look forward to see such a kind of mechanism implemented in Xen. that's exactly what heartbeat2 does. -- Javier _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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