Questions about SnapRAID

johnvick · 10. Mai 2020

I have 4x4TB WD reds for data an an external 5TB Seagate USB for partity. I use a once daily helper script to sync/scrub etc. All working fine. From my reading the recommended max data drives is 4 per partity drive. Is my understanding correct that the logic behind this is that if you go beyond 4 data disks you run a higher risk of disk failure during a rebuild? Or are there other reasons? I have read of someone using 9 disks for one parity.

If I decide to go beyond 4 (which I tried briefly then reversed) is there a way to supress the SnapRAID warning message about too many data disks?

John

gderf · 11. Mai 2020

Those are published guidelines, and not strict hard and fast rules. It's up to you to decide how much risk to take. More parity drives means having the ability to recover from more simultaneous data drive failures.

I have been running with two parity drives for quite some time and my data drive count is now at eight. I guess that is why I have never seen the message about too many data disks.

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