Running recent CURRENT on most of our lab's boxes, I was in need to replace and 
restore a
ZFS RAIDZ pool. Doing so, I was in need to partition the disks I was about to 
Well, the drives in question are 4k block size drives with 512b emulation - as 
most of
them today. I've created the only and sole partiton on each 4 TB drive via the 

gpart create -s GPT adaX
gpart add -t freebsd-zfs -a 4k -l nameXX adaX

After doing this on all drives I was about to replace, something drove me to 
check on
the net and I found a lot of websites giving "advices", how to prepare large, 
drives for ZFS. I think the GNOP trick is not necessary any more, but many blogs
recommend to perform

gpart add -t freebsd-zfs -b 1m -a 4k -l nameXX adaX

to put the partition boundary at the 1 Megabytes boundary. I didn't do that. My
partitions all start now at block 40.

My question is: will this have severe performance consequences or is that 

Since most of those websites I found via "zfs freebsd alignement" are from 
years ago, I'm
a bit confused now an consideration performing all this days-taking resilvering 
let me loose some more hair as the usual "fallout" ...

Thanks in advance,


O. Hartmann

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