On Wed, Aug 15, 2012 at 10:40:08PM +1000, Joseph Glanville wrote:

Hi James, Kent.

I can confirm this is the issue I was seeing, thanks for locating the
blkback issue!

Cool!

Is there anything xen-devel should be doing about this? I wouldn't
expect blkback to care about block size...

Well, I wouldn't be surprised if Windows doesn't work on a device with
block size > 512 bytes. But Linux (ext4 at least) certaintly does work
with 4k blocks - unless maybe it was breaking on something in the boot
process?

So it sounds like this might be indicative of a bug in blkback.

Joseph.

On 14 August 2012 09:30, James Harper [off-list ref] wrote:

quoted

quoted

Just mentioned this in the other thread, but if this is due to the 4k blocksize -
that's easy to fix: just format with 512 byte blocksize

make-bcache --block 512

Maybe I should change the default.

I suggest making the default 512, but also print a warning if the user didn't explicitly set it,eg "Block size not set - defaulting to 512 bytes"

James
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