(Solved) Need suggestions on upgrading to dual parity

[prtsmgr]

Hello,

I just upgraded to 6.4.1 and would like to upgrade to dual parity,  larger data drives and cache pool.

I only have room for 6 HDD and 2 SSD.

 

Currently I have:

1 x 3TB Parity drive

5 x 3TB Data drives (disk 1 is currently empty as it is failing)

1 x SSD cache drive

 

I would like to upgrade to:

2 x Parity drives (6TB or greater)

4 x Data drives (6TB or greater)

2 x SSD Cache pool

 

Should I upgrade single parity to a larger drive first before removing the failing drive?

Should I remove the failing drive, reassign the others and rebuild parity before upgrading to a larger parity drive?

Or could I remove the failing drive, reassign the others and upgrade to larger dual parity drives all at the same time?

 

Edited February 5, 2018 by prtsmgr
Solved

[JorgeB]

If you want to remove the failing drive best way would be to do a new config with the remaining data drives and new parity, a parity sync will be done at first array start, check that all other disks have healthy SMART reports before doing it though.

[Frank1940]

You might want to read this thread.  It presents some statistical calculation on the risk involved involving data arrays with no parity, single parity and dual parity.

 

         https://lime-technology.com/forums/topic/50504-dual-or-single-parity-its-your-choice/

 

 

I would suggest reading the entire thread as that were several interesting statistical points and other risks factors discussed.  ('Yes, Virginia, there are other risks of data loss besides drive failures') 

[prtsmgr]

Thank you both for the replies, especially the link frank1940 provided on the benefits of single vs dual parity.

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