On Donnerstag 19 Februar 2009 Christoph Hellwig wrote:
> Barriers are disabled using hdparm. To make sure qemu/kvm doesn't
> cache your image file specify cache=off on the command line
> specifying that virtual disk.
I have "nobarriers" for XFS, and a RAID controller with writeback cache.
The "cache=off" seems to be for kvm only, so doesn't help me with XEN.
> make sure you do not cache the virtual block device in the host
> pagecache, and that in doubt the write cache of the disk is turned off
> as barriers most likely won't work through the virtualization stack.
Isn't that what "tap:aio" in XEN does?
I really want and need to find a secure way to run XEN clients. Is that
data loss I had the fault of XFS, XEN or something else?
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