[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Disk naming (Was Re: [Xen-devel] [PATCH] Guest boot loadersupport [1/2])
On Fri, 15 Apr 2005, Mark Williamson wrote: > > > Does that answer your question or am I still off target? > > > > It does. So, it's the blkback in dom0 that requires a device node. > > Yup, that's why we have to go through the gyrations with the block scripts in > order to make things look nice at the user level. > > > How > > about it the blkback were extended to support files in filesystems? > > Right now, all the backend needs to know about is what block device to plumb > requests through to. I don't really think there's a nice way to make it > aware of files within filesystems without effectively reimplementing the > loopback driver. The blkfront driver should request id+offset+length from the blkback driver. The blkback driver then converts the id into either a device, or a file. Seems rather straight forward to me. > From what I've heard the loop driver itself could use a bit of work to make it > really useful: it comes at a performance / memory usage hit :-(. We > recommend using LVM for any really serious environments for this reason. > > An alternative architecture would be to have a userspace daemon for file > backed VBDs, using the blktap framework (unstable tree only). I'm not sure > if this would work any better than the current way of doing files, tho... blktap? Is that similiar to what I described above? _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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