Apr 28, 2022 · Spare drives are not worth it in my opinion. If the system is at home, you can easily access it and do not need a spare drive. If the system is far away, instead of just sitting there burning up electricity and spinning hours waiting for the chance to jump in, you could use that drive by using RAID-Z3 instead of RAID-Z2.

RAID-Z3 of 11x 8TB drives or 2x RAID-Z2 of 6x 8TB drives. Both net the same usable pool of storage. This is mostly for single-user archival storage / backup / media files. Here's the pros/cons as I see them: Pros of RAID-Z3 config:

May 22, 2006 · The lower F is, the GREATER the advantage of RAID-Z3 over RAID-10 for minimizing chance of data loss. If F=1%, then the probability of data loss with RAID-Z3 is only 0.011%. That is a factor of 87 times higher chance of data loss with RAID-10 …

Mar 22, 2019 · Bad sectors are only a problem if you have already lost two drives and you will lose the stripe where the bad sectors actually are and hence you will then lose the file(s) that contain that stripe, if you run scrubs regularly then any detected bad sectors will have the stripe reconstructed using the parity data and a new stripe will be written ...

Apr 18, 2023 · RAID-Z3 (3 disks working on parity): 9 disks*100 MB/s=900 MB/s. This information (and more) can also be found in the book: FreeBSD Mastery by Michael W Lucas and Allan Jude. Reply reply

Feb 4, 2022 · 15 votes, 21 comments. true. Yes, the TrueNAS docs are talking about a single mirror vdev having slower sequential I/O than a RAID-Z vdev whereas those articles are comparing a pool with one RAID-Z vdev vs a pool made from multiple mirror vdevs which is ZFS's equivalent to RAID-10.

Dec 30, 2019 · Is ten 10TB drives in a ZFS raid too many? Or would Z2 or Z3 be sufficient to survive rebuild on disk failure

Jan 12, 2018 · Mathematically speaking (in sense of data safety vs. disk failure) 12 disk RAID Z3 is safer than 2 x RAID Z2 6 disks. Why: Because on Z3 3 random disk can fail and you are still safe. If 3 disks at once on one RAID Z2 fail the one RAID Z2 is lost. Nevertheless because of performance (I ignored above) you should maybe use 2 x RAID Z2.

Dec 17, 2013 · This is a sub that aims at bringing data hoarders together to share their passion with like minded people

Jan 27, 2021 · 12 votes, 30 comments. I'm looking at setting up two ZFS servers for general purpose NFS. One will be the primary with 120 12TB Hard drives.