Re: add to Debian

On 7 August 2012 16:16, James Harper [off-list ref] wrote:

quoted

Hi James,

Yes the current patches apply cleanly afaik. :)

There is still an outstanding bug with relation to Xen's blkback that I haven't
had time to debug further yet that you might run into.

What are the circumstances under which this bug appears? I'm planning on doing this initially:

sd[ab]
md0
lvm
bcache (per lv)

for testing, and then exposing the cached device to xen. Assuming testing goes well I'll do it like this:

sd[ab]
md0
bcache
lvm

with a bit of reworking to create a non-bcache'd /boot raid unless grub2 knows all about bcache, or if bcache is transparent to grub2.

James

That is precisely the setup I am currently using.

I haven't done much debugging yet unfortunately but I can't get VMs to
boot using PV disk drivers (they work fine using QEMU).

I think it has something to do with DM/blkback interactions with
bcaches bio splitting code, the bug only emerged recently and older
versions of bcache work fine.

Joseph.

-- 
CTO | Orion Virtualisation Solutions | www.orionvm.com.au
Phone: 1300 56 99 52 | Mobile: 0428 754 846