On 13 August 2012 17:16, James Harper [off-list ref] wrote:

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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This could very well be the issue I was having, I haven't been able to
pull the latest bcache code for a few days (repo down?) but if I can
help debug let me know.

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