Excerpts from Arne Jansen's message of 2011-04-11 13:42:49 -0400: > On 08.02.2011 19:03, Arne Jansen wrote: > > In a multi device setup, the chunk allocator currently always allocates > > chunks on the devices in the same order. This leads to a very uneven > > distribution, especially with RAID1 or RAID10 and an uneven number of > > devices. > > This patch always sorts the device before allocating, and allocates the > > stripes on the devices with the most available space, as long as there > > is enough space available. In a low space situation, it first tries to > > maximize striping. > > The patch also simplifies the allocator and reduces the checks for > > corner cases. Additionally, alloc_start is now always heeded. > > It's been quite some weeks since this patch has been posted. In the > meantime several issues popped up that are already addressed by this > patch. > Currently multi-device btrfs just don't work as advertised, a 'balance' > operation does not spread the data evenly over all disks and with > multiple devices a substantial amount of space can be wasted. > I'd be happy if someone could have a look at the patch so that chris > can pull it. Diff did some funny things to it so it's best to just pull > it in and read the results. My big complaint about this patch is that it is a feature fix mixed in with a huge cleanup. It's hard to differentiate between the two. Could you please separate it out so we can review them independently? -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
