Simple question regarding GPT and UFS for data only

[Greg Rivers]

On Fri, 13 May 2011, Lucas Reddinger wrote:

> Hi everyone,
>
> I can't find assurance in the man pages that I'm doing this correctly, 
> so I'd greatly appreciate confirmation or correction.
>
> I have two 3 TB disks, which I want to mirror. I then want a single UFS 
> for /usr/home.
>
> Here is what I did:
> gmirror label -vb round-robin gm0 /dev/ada2 /dev/ada3
> gpart create -s GPT /dev/mirror/gm0
> gpart add -t freebsd-ufs mirror/gm0
> newfs -U /dev/mirror/gm0p1
> mount /dev/mirror/gm0p1 /usr/home
>
> Did I miss anything? Do I need boot blocks? It seems to work, but "seems 
> to" isn't good enough on a production system.
>

What you did is fine.  Don't forget to update /etc/fstab.  You're not 
booting from this device, so you do not need boot blocks.  In fact, since 
you only want a single file system on the mirror, you don't need to 
partition it.  For a volume of this size, you'll probably want to adjust 
the number of bytes/inode.  For best performance, I suggest you use the 
default balance algorithm "load" for the mirror.

In other words, this is sufficient:

 	# gmirror label gm0 /dev/ada2 /dev/ada3
 	# newfs -U -i 16384 /dev/mirror/gm0
 	# mount /dev/mirror/gm0 /usr/home

-- 
Greg Rivers