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--- computing:storage:zfs_defrag [2017/05/05 09:06]
gcooper created
+++ computing:storage:zfs_defrag [2017/05/06 13:10] (current)
gcooper
@@ Line 1: / Line 1: @@
 ====== ZFS Filesystem Fragmentation ======
-ZFS does not have a huge problem with fragmentation.  However, over time and especially
+ZFS does not have a huge problem with fragmentation.  However, over time and especially when the ZFS filesystem gets over 70% full, fragmentation occurs.
+:!: The ''FRAG'' column of a ''zpool list'' command shows how fragmented the **free space** is.
+  * https://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSZpoolFragmentationMeaning
+:!: There is no 'defragging tool' for ZFS.
+The easiest and most sure way to defragment a ZFS pool is to use ''zfs send'' and ''zfs recv'' to copy the data out of the fragmented pool and into a new, unfragmented pool.  This is not unlike other filesystems.
+https://pthree.org/2012/12/20/zfs-administration-part-xiii-sending-and-receiving-filesystems/
+http://docs.oracle.com/cd/E19253-01/819-5461/gbchx/index.html
+http://docs.oracle.com/cd/E19253-01/819-5461/gbinw/

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