On 06/10/2011 10:45 AM, David Brown wrote:
Making multiple parity syndromes is easy enough mathematically:
Adam Leventhal, who wrote the double parity and triple parity code for ZFS, mentioned on his blog [1] that going beyond triple parity poses significant challenges if write performance should not suffer.
In particular, it looks like a relevant math paper (originally) had a flaw in the claim that quad parity and above can be implemented just like triple parity.
I don't know the implementation you were going to use, neither am I knowledgeable about multi-parity in general. I only thought it might be relevant to add to the current discussion that other people had issues with implementing N-parity for N > 3.
Christoph [1] http://blogs.oracle.com/ahl/entry/triple_parity_raid_z -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
