On 7 August 2012 16:16, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote: >> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
