Most time/hardware life efficient way to upgrade/increase raidz2

borisattva

Dabbler
Joined
Apr 22, 2012
Messages
20
This isn't so much request for upgrade support, as wishing to understand the behind the scenes implications of these two ways of upgrade the system.

TrueNAS-12.0-U7
HP N40L
TOSHIBA DT01ACA200: 1x2TB
Seagate ST2000DM001: 3x2TB
WDC WD40EFZX: 1x4TB
RAIDZ2 6TB

Recently I picked up 4 more of the 40EFZX.
I would now like to replace the current 4x2TBs with the 4x4TB, and increase the pool size afterwards to 12TB.

One of the options is to follow the steps here https://www.truenas.com/docs/core/storage/disks/diskreplace/
and replace the remaining 4 drives 2 at a time per each re-silvering since failure of 2 is supported.

Alternatively, I can resilver them 1 at a time.
Would this me more, or less of the strain in the system than 2 at a time?

Another way still:
There is only about ~2.5TB of data on this NAS right now.
2 plugins.
I could just move the media data over to 5TB external HD I have.
Completely rebuild the pool from scratch with the new drives.
Copy all the contents from the back up drive.

Since there would be no re-silvering strain on the system, this seems like optimal in terms of hardware longevity, and possibly time spent since there would be only 2 instances of copying the data. At least if comparing to the 1 drive at a time 4 instances of re-silvering.

What do you recommend, and why?

Thank you.
 
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