Re: [Xen-devel] blkback and bcache

[Kent Overstreet <koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>]

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 <james.harper-NMzNsA1hOHcW+bLBXbPJGg@public.gmane.org> wrote:
> >>
> >> 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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> 
> 
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