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--- server:nas4free_build [2015/08/02 01:42] – ashley
+++ server:nas4free_build [2015/08/28 20:22] (current) – [4K sectors] ashley
@@ Line 52: / Line 52: @@
 Save and exit
+====4K sectors====
+For each device which will be made a part of the pool, a gnop "chained" device needs to be created, and then those devices need to be added to a pool:
+  gnop create -S 4096 /dev/da0
+  gnop create -S 4096 /dev/da1
+  zpool create data mirror /dev/da0.nop /dev/da1.nop
+This will create the "data" pool with the *.nop devices, making ZFS think the drives have 4K physical sectors. Next, the pool needs to be exported and the gnop devices removed:
+  zpool export data
+  gnop destroy /dev/da0.nop /dev/da1.nop
+Next, the pool can be imported from the "raw" devices:
+  zpool import data
+You can check the configuration of the pool by using the "zdb" command on the pool:
+  zdb -C data | grep ashift
+The ashift should be "12" for 4K alignment. This works because ZFS writes the ashift value in its metadata.
 ====Plex====