Greetings everyone. I've recently rebalanced my btrfs (kernel 3.13) running on two SSD drives (raid-0) and a question arose. Does btrfs perform TRIM on SSD balance? Fs is mounted with 'ssd' option, but not 'discard'. It seems fstrim only trims free chunks in allocated space, so we possibly having a "trim leak" if no special treatment is taken on blocks reallocated during balance operation. root@midnight:/mnt/tmp# fstrim -v / /: 0 bytes were trimmed root@midnight:/mnt/tmp# btrfs fi df / Data, RAID0: total=90.00GiB, used=86.84GiB System, RAID1: total=32.00MiB, used=12.00KiB Metadata, RAID1: total=4.00GiB, used=2.56GiB root@midnight:/mnt/tmp# btrfs fi show / Label: ssdbtrfs uuid: f61f749b-dce6-4e73-9d53-693e93ad61aa Total devices 2 FS bytes used 89.41GiB devid 1 size 111.31GiB used 49.03GiB path /dev/sda2 devid 2 size 111.31GiB used 49.03GiB path /dev/sdb2 Btrfs v3.12 Best regards, Sergey E. Kolesnikov -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html