[Xen-devel] blkback and bcache

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

I'm having trouble using blkback under gplpv when the disk is on top of a 
bcache device. My devices are layered as follows:

/dev/sd[ab]
md0 (RAID1)
bcache
lvm

It seems that bcache presents a 4K sector size to Linux, which is then 
reflected by lvm and in turn blkback.

Obviously GPLPV isn't handling 4K sectors correctly... any suggestions as to 
what I might need to do to make this work properly? As a last resort I should 
be able to fake 512 byte sectors to Windows but would prefer that Windows knew 
it was dealing with a device with 4K sectors underneath.

Thanks

James

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