Il 08/01/2013 13:12, Kevin Wolf ha scritto: >> > Okay, I see the code indeed support WCE but it requires Guest kernel to >> > support it. For the kernel doesn't support it, there is no way to >> > disable write cache, no? > With Linux guests, it's possible for SCSI. I'm not sure about > virtio-blk, but you might be right that you can't manually change it there.
New enough kernels support it. Also, if you reboot from a system that supports writeback to one that doesn't (including old-enough Linux), the new QEMU will be able to use writethrough while running on the older system. Paolo
