Scharbag
Guru
- Joined
- Feb 1, 2012
- Messages
- 620
I am upgrading my production pool. 1 of the 2 6-drive Z2 vDevs will go from 4TB to 6TB drives. This will also free up some 4TB drives that I can move into my backup pool.
My backup pool is a single vDev 12 disk Z2 vDev. It is a mix of 3TB and 4TB drives. I will not have enough 4TB drives to complete the backup pool upgrade. I am considering, once my production pool is resilvered and running stable, is to destroy and re-configure my backup pool (pucker factor while waiting for Rsync...). All this pool is used for is snapshots and Rsync backups. Reads would only be required on a file restore so speed is not a concern for me.
My question is: is it unwise to run a single 18 drive Z3 vDev for backup purposes? My other option, and likely preferred, would be to run 2 9 drive Z2 vDevs, one made up of 4TB and one made up of 3TB drives. Even though it has 4 parity drives, it does not waste 1TB*9 drives... The choices...
I have a 20 bay and a 24 bay chassis, so once I add the new 6TB drives, I will be space limited and will be forced to upgrade in place. Not a big deal as either option will require the replacement of 9 3TB drives before additional space is realized through auto expand. My 3TB drives are the oldest and my plan is to replace them with 4TB drives as they fail.
Anywhoo, which way makes more sense (I think I figured out the answer as I typed this... :) )?
Cheers,
My backup pool is a single vDev 12 disk Z2 vDev. It is a mix of 3TB and 4TB drives. I will not have enough 4TB drives to complete the backup pool upgrade. I am considering, once my production pool is resilvered and running stable, is to destroy and re-configure my backup pool (pucker factor while waiting for Rsync...). All this pool is used for is snapshots and Rsync backups. Reads would only be required on a file restore so speed is not a concern for me.
My question is: is it unwise to run a single 18 drive Z3 vDev for backup purposes? My other option, and likely preferred, would be to run 2 9 drive Z2 vDevs, one made up of 4TB and one made up of 3TB drives. Even though it has 4 parity drives, it does not waste 1TB*9 drives... The choices...
I have a 20 bay and a 24 bay chassis, so once I add the new 6TB drives, I will be space limited and will be forced to upgrade in place. Not a big deal as either option will require the replacement of 9 3TB drives before additional space is realized through auto expand. My 3TB drives are the oldest and my plan is to replace them with 4TB drives as they fail.
Anywhoo, which way makes more sense (I think I figured out the answer as I typed this... :) )?
Cheers,