On Tue, Sep 29, 2015 at 12:21:39PM +0000, Hugo Mills wrote: > On Tue, Sep 29, 2015 at 08:10:19AM -0400, Austin S Hemmelgarn wrote: > > On 2015-09-29 08:00, David Sterba wrote: > > >On Mon, Sep 28, 2015 at 05:57:05PM +0000, Gabríel Arthúr Pétursson wrote: > > >>The attached patches to linux and btrfs-progs add support for filtering > > >>based on the number of strips in a block when balancing. > > > > > >What usecase do you want to address? As I understand it, this would help > > >the raid56 rebalancing to process only blockgroups that are not spread > > >accross enough devices. > > Exactly. Last week, I was trying to help Gabríel on IRC with a > close-to-full filesystem balance it to add some new devices in a > parity RAID configuration. He'd added the devices and balanced, but > the usage was unequal across the devices. The only way I could think > of dealing with it with the current tools was either to do a full > balance repeatedly until it worked itself out, or to delve into the > metadata with btrfs-debug-tree, and balance selected block groups > individually. > > I whinged that we needed a filter to pick just the block groups > that weren't "as full as possible", and Gabríel picked up the idea and > ran with it. That's great, thanks. The stripe filters are really missing. -- 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
