Failing Disks, Best Way To Upgrade While Replacing?

[ndboost]

I currently have the following system:

• 4x 1.5TB Seagate HDDs
• Norco RPC-2008 2U Case
• Super Micro X9SCM-F
• IBM M1015 JBOD
• 32GB DDR3 Memory

The case has 8x hot swap bays, im currently utilizing 4x of them.

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da0 and da1 are failing with unreadable sectors and i wanted to start putting a plan of action together to upgrade the array to 2TB WD Red's. I will eventually be going for:

• 4x 2TB WD Reds
• 1x 2TB WD Red - offline spare

I have a few questions as I've never tackled doing a disk swap like this on freenas (ive only done single disk replacements).

• how can i swap the HDDs out without losing data, if im using different size and brand disks
• if this isn't possible, will i need to create a new zraid with the new disks and then how do i get the data onto the new disks efficiently
• if i can swap the HDDs, do i do it one at a time slowly as money and time permits and let the raid rebuild each time?

EDIT:
So after posting this i realize its probably in the wrong section, and the freenas manual has outlined how to do the steps.. It seems the best method is to replace one drive at a time as money permits, resilver each time.

Will my zpool auto grow once all disks are replaced?

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FYI, this is X posted on reddit.. http://www.reddit.com/r/freenas/comments/1qjwno/failing_disks_best_way_to_upgrade_while_replacing/

 

[cmfisher4]

Yes, when the last drive is replaced that matches the size of all the other (larger) drives, the size will grow.

 

[ndboost]

thanks cmfisher4, ill get "Mission Control" to start signing off on me buying 5 $100/ea HDDs :D lol

 

[cmfisher4]

Yeah, good luck with that. I've been struggling with that myself.