raid10n2/xfs setup guidance on write-cache/barrier

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I want to create a raid10,n2 using 3 1TB SATA drives.
I want to create an xfs filesystem on top of it.
The filesystem will be used as NFS/Samba storage.

mdadm --zero /dev/sdb1 /dev/sdc1 /dev/sdd1
mdadm -v --create /dev/md0 --metadata=1.2 --assume-clean
--level=raid10 --chunk 256 --raid-devices=3 /dev/sdb1 /dev/sdc1
mkfs -t xfs -l lazy-count=1,size=128m -f /dev/md0
mount -t xfs -o barrier=1,logbsize=256k,logbufs=8,noatime /dev/md0

Will my files be safe even on sudden power loss? Is barrier=1 enough?
Do i need to disable the write cache?
with: hdparm -W0 /dev/sdb /dev/sdc /dev/sdd

I tried it but performance is horrendous.

Am I better of with ext4? Data safety/integrity is the priority and
optimization affecting it is not acceptable.

Thanks and any advice/guidance would be appreciated
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