Please review my upgrade plan

[Jambones]

Been using FreeNAS for a while now. Started with v8.x and am now at 9.2.1.5. I'm starting to run out of space and am planning my first disk upgrade. I was hoping that someone could review my approach and tell me if I'm on the right path.

My objective is to add another 3TB drive to one side of mirror-1, which as I understand, should grow that vdev and add space to the overall pool.


Here is some detail about storage config:


# list all disks in system (ideally would like to match the larger size of ada0)
[root@storage1 ~]# grep ad /var/run/dmesg.boot |grep -i sector
ada0: 2861588MB (5860533168 512 byte sectors: 16H 63S/T 16383C)
ada1: 1907729MB (3907029168 512 byte sectors: 16H 63S/T 16383C)
ada2: 1907729MB (3907029168 512 byte sectors: 16H 63S/T 16383C)
ada3: 1907729MB (3907029168 512 byte sectors: 16H 63S/T 16383C)



# list mirrors
[root@storage1 ~]# zpool status tank
pool: tank
state: ONLINE
scan: scrub repaired 0 in 9h54m with 0 errors on Sun Jun 22 12:54:37 2014
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/da41bcfc-8d1a-11e2-934a-f46d042b95c3 ONLINE 0 0 0
gptid/da9e600a-8d1a-11e2-934a-f46d042b95c3 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
gptid/05004c21-9819-11e2-a644-f46d042b95c3 ONLINE 0 0 0
gptid/0576c42b-9819-11e2-a644-f46d042b95c3 ONLINE 0 0 0


# find partition lables so that I can determine mirror info above (mirror partner found at ada3)
[root@storage1 ~]# glabel status
Name Status Components
gptid/05004c21-9819-11e2-a644-f46d042b95c3 N/A ada0p2
gptid/da41bcfc-8d1a-11e2-934a-f46d042b95c3 N/A ada1p2
gptid/da9e600a-8d1a-11e2-934a-f46d042b95c3 N/A ada2p2
gptid/0576c42b-9819-11e2-a644-f46d042b95c3 N/A ada3p2
ufs/FreeNASs3 N/A da0s3
ufs/FreeNASs4 N/A da0s4
ufsid/50c8c7da3400b84f N/A da0s1a
ufs/FreeNASs1a N/A da0s1a
ufs/FreeNASs2a N/A da0s2a



I've been spending some time to read about 'zpool replace'. (http://docs.oracle.com/cd/E19253-01/819-5461/gbcet/index.html) Can I just power down the system, replace the 2TB drive at ada3, and then issue a single 'zpool replace' command? Or should I do anything before powering down?

Thanks for the advice....

 

[bestboy]

a) You should use the web UI to replace the drives. There is stuff going on under the hood.
b) There is a whole chapter in the manual about how to replace drives with the goal to grow a pool.

 

[danb35]

Is ada2 a 3 TB drive? If not, replacing only ada3 won't do anything for your overall capacity.

 

[Ericloewe]

Follow the manual and use the GUI.

 

[Jambones]

@danb35 On this system, the pair of mirror-1 is made up of ada0 and ada3. Since ada0 is already a 3TB, my plan is to make ada3 equal to that. I'm under the impression that I currently have 1TB of space going to waste on ada0 because it is mirrored to a 2TB disk.

@Ericloewe @bestboy I've reviewed this page (http://doc.freenas.org/index.php/Volumes#Replacing_Drives_to_Grow_a_ZFS_Pool) which leads to this page (http://doc.freenas.org/index.php/Volumes#Replacing_a_Failed_Drive). This latter page suggests that the target drive be Offlined first, before the power down and replacement. Am I in the right place?

 

[Ericloewe]

@danb35 On this system, the pair of mirror-1 is made up of ada0 and ada3. Since ada0 is already a 3TB, my plan is to make ada3 equal to that. I'm under the impression that I currently have 1TB of space going to waste on ada0 because it is mirrored to a 2TB disk.

@Ericloewe @bestboy I've reviewed this page (http://doc.freenas.org/index.php/Volumes#Replacing_Drives_to_Grow_a_ZFS_Pool) which leads to this page (http://doc.freenas.org/index.php/Volumes#Replacing_a_Failed_Drive). This latter page suggests that the target drive be Offlined first, before the power down and replacement. Am I in the right place?

Yeah, follow the instructions there.