BER and large disks- which RAID is better?

[Johhhn]

I asked this in another thread, but I think it was either dismissed or not looked at. Regardless, I have a pretty serious question and was hoping someone could provide an accurate answer.

1- Does ZFS eliminate BER problems when rebuilding a degraded RAID?

2- I know in other file systems, with LARGE disks (>1.5TB), a simple RAID rebuild (5 or 6) can cause the entire RAID to go offline as it will discover other bit errors. If this is not the case, are we safe using raidz2 or raidz3?

thanks!

 

[gpsguy]

No, ZFS doesn't eliminate the issue.

As you pointed out, one could lose another disk, while ZFS was resilvering after replacing a failed drive.

That's why RAIDz2 or RAIDz3 is recommended. All to often we hear about user's who want to put a 8+ 3-4Tb drives in a RAIDz1 array, because they "can't afford" the extra drives or don't want to loose the "extra space". And, they don't think they need backups either.

 

[Johhhn]

Hi, thanks for you response. I was under the impression since ZFS is a software controller that i can ignore those bad bits-- or am I wrong here?