[Lustre-discuss] Lustre + qemu/kvm issue
danny.sternkopf at csc.fi
Mon Oct 15 01:15:14 PDT 2012
I wonder if there is anyone out there who has a working test or even
production environment using Lustre for VM disk images?
I run into the Lustre Direct I/O problematic which requires the
application to read and write in 4K I/O chunks. qemu/kvm uses 512 byte
as I/O size and refuses to start the VM. In this case cache is "none".
If I change the cache mode to writethrough (default) then the VM stored
on Lustre can be started, but it has very poor write performance.
(100-times worse) Any hints?
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