> > 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. > If I get time to get it all going I'll have a look. If it's blkback interaction problems I should be able to help track it down, although it might be a few days before I can actually get to look at it. James -- 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
