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I can answer the following questions from personal experience; You asked: How long does it take for FreeNAS to recover from a 2-disk failure in RAIDZ2? I note: I am presently replacing an existing non-failed drive with another new larger drive using the "Replace" command found in Volume Status. 4.67T of data needed to be scanned. I got a 30M/s ...


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I would argue that running FreeNAS with non-ECC RAM is a stupid idea, as is running it as a virtualized guest, when the data stored on the ZFS volume is important. Joshua Paetzel, one of the FreeNAS developers, has a good write-up on this topic: ...


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The idea of sync writes is really a good idea for boot disks, which are key to virtualization. You want to wait for an acknowledgement. Speed is not an issue at boot, durability should be. When you need performance, go to something speedier. Performance and reliability are always a tradeoff. On of my pet peeves is when people want really speedy VM ...


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You can use zfs send ... that way you easily "save" everything that is in the filesystem. Including but not limited to hidden files, file attributes, extended attributes, zvols, snapshots, etc. Actually you can make "replica" filesystem on your spare drive, mount it, or even boot it, to see it's complete, workable and bootable and then proceed with ...


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Here is how I would approach it, purely using FreeNAS GUI: Set up periodic snapshot task for a recursive snapshot from your root dataset (e.g. volume x) Use temp drive to create as a simple 1-disk stripe volume, say, volume y. Establish replication to that drive, x to y. Wait before replication is done. Set up periodic snapshot task for a recursive ...


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I believe the reason why you are seeing things like errors: Permanent errors have been detected in the following files: <0x7c343>:<0x45b6bcd> is because the data still exists in a snapshot, and only a snapshot. Remember that a snapshot in ZFS is only a point-in-time marker; it does not actually copy any blocks, it simply keeps the ...


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NAME STATE READ WRITE CKSUM projects FAULTED 0 0 1 gptid/49d49544-5a47-11e2-b516-00259095142c ONLINE 0 0 0 gptid/49f3c886-5a47-11e2-b516-00259095142c ONLINE 0 0 2 gptid/4a1052aa-5a47-11e2-b516-00259095142c ONLINE 0 0 ...


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Reliability has different components to it. One is how reliable it is to go all the way with recommended hardware in mainstream configuration, set it up once, then NOT touch it, and watch how reliable things are. I'd rate FreeNAS pretty high on that. Another is reliability taking into account various human error factors (non-standard configuration, ...


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Looks like you are taking regular Snapshots of your ZFS Datasets. Any data deleted will be preserved in the snapshots. To delete a snapshot, run zfs destroy raid-1@[snapshotname] For a complete explanation on snapshots, take a look at the Documentation If you want to delete a bunch of Snapshots at once, take a look at this answer.



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