On Sun, Jun 12, 2016 at 10:06 PM, Anand Jain <anand.j...@oracle.com> wrote: > > > On 06/03/2016 09:50 AM, Andrew Armenia wrote: >> >> This patch adds mount option 'chunk_width_limit=X', which when set forces >> the chunk allocator to use only up to X devices when allocating a chunk. >> This may help reduce the seek penalties seen in filesystems with large >> numbers of devices. > > > Have you reviewed implementations like device allocation grouping? > Some info is in the btrfs project ideas.. > > https://btrfs.wiki.kernel.org/index.php/Project_ideas > Chunk allocation groups > Limits on number of stripes (stripe width) > Linear chunk allocation mode > > (Device allocation grouping is important for enterprise storage solutions). > > Thanks, Anand
I have looked at those ideas; allocation groups are what I'm ideally after but I decided to start out small. I just spotted the dev_group field in the device tree that appears to be currently unused, so perhaps I will look at developing a group-aware allocator instead of just limiting the chunk width. -Andrew -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
