zpool status 'One or more devices are configured to use a non-native block size.'

[Gessi]

Sorry guys but I need to ask something while looking at my (one and only) zfs pool on my FreeNAS running "FreeNAS-9.10.2-U6 (561f0d7a1)" on 3xWD Red Pro 6TB" disks.

What does this error mean and how to resolve this (block size: 512B configured, 4096B native)?
Can this be done without data migration or creation of a new pool!?

Code:

[root@freenas ~]# zpool status -v pool1																							 
  pool: pool1																													   
state: ONLINE																													 
status: One or more devices are configured to use a non-native block size.														 
		Expect reduced performance.																								 
action: Replace affected devices with devices that support the																	 
		configured block size, or migrate data to a properly configured															 
		pool.																													   
  scan: scrub in progress since Fri Oct  6 13:43:50 2017																			
		244G scanned out of 4.23T at 277M/s, 4h11m to go																			
		0 repaired, 5.64% done																									 
config:																															 
																																	
		NAME											STATE	 READ WRITE CKSUM												 
		pool1										   ONLINE	   0	 0	 0												 
		  raidz1-0									  ONLINE	   0	 0	 0												 
			gptid/c6215030-c8e5-11e5-b9dd-0cc47a79eea0  ONLINE	   0	 0	 0												 
			gptid/c68fd84b-c8e5-11e5-b9dd-0cc47a79eea0  ONLINE	   0	 0	 0												 
			gptid/c6f84301-c8e5-11e5-b9dd-0cc47a79eea0  ONLINE	   0	 0	 0												 
		logs																														
		  mirror-1									  ONLINE	   0	 0	 0												 
			gptid/5ca6807b-d005-11e5-be96-0cc47a79eea0  ONLINE	   0	 0	 0  block size: 512B configured, 4096B native	   
			gptid/5ef1aa8a-d005-11e5-be96-0cc47a79eea0  ONLINE	   0	 0	 0  block size: 512B configured, 4096B native	   
		cache																													   
		  ada3p2										ONLINE	   0	 0	 0												 
		  ada4p2										ONLINE	   0	 0	 0												 
																																	
errors: No known data errors

 

[garm]

Do you really need ZIL and L2ARC devices in such a small pool? Have you actually got any performance increase from them?

As I understand it the problem is in regard to striped drives in a pool of Advanced Format drives that lie about their block size and it’s not trivial to deal with, especially not on FreeNAS