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--- software:linux:btrfs [2016/11/11 00:37] – superwizard
+++ software:linux:btrfs [2016/11/17 03:26] (current) – superwizard
@@ Line 1: / Line 1: @@
+====== Scripts for btrfs maintenance tasks like periodic scrub ======
+From: https://github.com/kdave/btrfsmaintenance
+<code>
+Great Documentation
+Scripts for btrfs maintenance tasks like periodic scrub, balance, trim or defrag on selected
+mountpoints or directories.
+</code>
 ====== btrfs check ======
@@ Line 11: / Line 23: @@
 From: http://marc.merlins.org/perso/btrfs/post_2014-03-19_Btrfs-Tips_-Btrfs-Scrub-and-Btrfs-Filesystem-Repair.html
+From: https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-scrub
@@ Line 16: / Line 30: @@
 <code>
 btrfs scrub start -Bd $mountpoint
-btrfs check --repair \dev\sb2
+btrfs scrub is used to scrub a btrfs filesystem, which will read all data and metadata blocks from
+all devices and verify checksums. Automatically repair corrupted blocks if there’s a correct copy
+available.
 start [-BdqrRf] [-c <ioprio_class> -n <ioprio_classdata>] <path>|<device>
@@ Line 38: / Line 55: @@
 set IO priority classdata (see ionice(1) manpage)
 -f
-force starting new scrub even if a scrub is already running, this can useful when scrub status file is damaged and reports a running scrub although it is not, but should not normally be necessary
+force starting new scrub even if a scrub is already running, this can useful when scrub status
+file is damaged and reports a running scrub although it is not, but should not normally be necessary
 status [-d] <path>|<device>
+</code>
+====== resize partition ======
+From: http://unix.stackexchange.com/questions/239765/how-to-fix-btrfs-superblock-error-after-resize-shrink-btrfs-couldnt-get-super
+<code>
+Fix
+First, a live system was booted to reduce the risk of damage while the system is running on a
+filesystem that's bigger than the partition it's on.
+Mount the filesystem:
+mount /dev/sda2 /mnt/tmp
+First shrink the second device to 50 GB - 1 GB = 49 GB to avoid rounding errors:
+btrfs filesystem resize 2:49g /mnt/tmp
+Resize it to fill the 50 GB partition:
+btrfs filesystem resize 2:max /mnt/tmp
+Check btrfs filesystem show, both devices should have the right size:
+devid    1 size 50.00GiB used 43.03GiB path /dev/sda2
+devid    2 size 50.00GiB used 43.03GiB path /dev/sdb2
+Unmount, reboot, the error should be gone.
 </code>