Guys i have 2 questions.
1. In zfs can you currently add more disks to an existing raidz? This is 
important to me as i slowly add disks to my system one at a time.

2. in a raidz do all the disks have to be the same size? This is the one thing 
that has always been a pain with a raid 5 as you need to split the disks into 
multiple raid 5's to use all the space.  I never understood why the system to 
not do the same thing behind the scenes for you.  EG 320gb x 4 and 1tb x 4.  
The ultimate is to only lose 1TB to parity instead of 1.32TB.  To me it is not 
the space loss so much as the extra drive slot that i lose.  instead i normally 
just create a raid5 of 320 x 8 and a rait 5 of 680 x 4.  I would prefer just to 
create one raidz with all the disks and let the system work out the best way to 
get the most data out of it.

I did do a test of the raidz with different size disks in a virtual machine and 
it would not let me create the raidz without using -F.  once i created it with 
-F the pool size seems a little strange and i can't work out the combo of disks 
and space lost to parity to get the filesize it returned.

Chris
 
 
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