How to detach volume if it's being used by freenas

[lohmag]

Hello!
I want to detach volume VOL1 and recreate RaidZ. But Freenas shows that it is using it for system files:
<code>df -h
Filesystem Size Used Avail Capacity Mounted on
freenas-boot/ROOT/FreeNAS-9.3-STABLE-201510290351 6.7G 532M 6.1G 8% /
devfs 1.0k 1.0k 0B 100% /dev
tmpfs 32M 5.3M 26M 17% /etc
tmpfs 4.0M 8.0k 4M 0% /mnt
tmpfs 10G 191M 10G 2% /var
freenas-boot/grub 6.2G 6.8M 6.1G 0% /boot/grub
VOL1 2.6T 724M 2.6T 0% /mnt/VOL1
VOL2 4.9T 153k 4.9T 0% /mnt/VOL2
VOL2/VOL2 12T 7.7T 4.9T 61% /mnt/VOL2/VOL2
VOL1/.system 2.6T 83M 2.6T 0% /var/db/system
VOL1/.system/cores 2.6T 6.1M 2.6T 0% /var/db/system/cores
VOL1/.system/samba4 2.6T 9.5M 2.6T 0% /var/db/system/samba4
VOL1/.system/syslog-b633c2c7df1f4d6cadfcdcfb916e584f 2.6T 2.9M 2.6T 0% /var/db/system/syslog-b633c2c7df1f4d6cadfcdcfb916e584f
VOL1/.system/rrd-b633c2c7df1f4d6cadfcdcfb916e584f 2.6T 329k 2.6T 0% /var/db/system/rrd-b633c2c7df1f4d6cadfcdcfb916e584f
VOL1/.system/configs-b633c2c7df1f4d6cadfcdcfb916e584f 2.6T 22M 2.6T 0% /var/db/system/configs-b633c2c7df1f4d6cadfcdcfb916e584f</code>

I want to destroy VOL1 volume is it safe becouse VOL2 have essential data?

 

[Bidule0hm]

Move the system dataset to somewhere else (System tab in the web GUI, then I don't remember the sub-tab but you'll find it, there's not 36000 tabs) ;)

 

[depasseg]

"System Tab -> System Dataset sub-tab -> Dataset dropdown"
Pick Vol2 and freenas will move the system dataset and files to vol2.

 

[lohmag]

Thank you! It is working.
There is another problem - I have now 10 empty disks and want to create raidz3 from it but how much would be perfomance issues with that? Or should i go with 9 disks raidz2? But there be one wasted disk.. How much perfomance issues with no propriete disk layout in raidz?

 

[depasseg]

You likely won't notice a difference between 9xRAIDZ2 and 10xRAIDZ3 (or 10xRAIDZ2). The big difference is between RAIDZ and striped mirrors.