> Not sure if there is much else to do about fragmentation apart from running a > balance which would probally make thje machine v sluggish for a day or so.
I think a full balance-run makes in this point of view no sense. A weekly freeing of unused and summarize of underused blocks make more sense. I prefer the https://github.com/liubogithub/btrfsmaintenance/ balance-script or weekly do the following: # remove empty data/meta block groups for fast free space btrfs balance start -v -dusage=0 /mountPoint btrfs balance start -v -musage=0 /mountPoint # quickly clean up the less used block groups # < 1% btrfs balance start -v -dusage=1 /mountPoint btrfs balance start -v -musage=1 /mountPoint # < 5% btrfs balance start -v -dusage=5 /mountPoint btrfs balance start -v -musage=5 /mountPoint # < 15% btrfs balance start -v -dusage=15 /mountPoint btrfs balance start -v -musage=15 /mountPoint # < 30% btrfs balance start -v -dusage=30 /mountPoint btrfs balance start -v -musage=30 /mountPoint # < 50% btrfs balance start -v -dusage=50 /mountPoint On my 13 TB-Raid 1 Array with 150 Snapshots this will finished in less then a hour (normaly i takes a half hour). But the first run will take muth more time of you have many data-blocks with <50% usage. so feel free to reduce the dusage-value if you need. -- 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
