2 ms·
Can having ~2.9 replicas be approximated by using an error-correcting code across a large enough number of drives? Isn't that how RAID 5/6/Z work?
by nitrogen 10y ago
Can having ~2.9 replicas be approximated by using an error-correcting code across a large enough number of drives? Isn't that how RAID 5/6/Z work?
- honkhonkpants 10y agoSort of but again no. He problem is if you have really wide coded stripes your I/O costs to reconstruct after a failure will be astronomical, and the probability of one failure increases with the number of participating devices. Besides you could not reshape the stripe in response to anticipated failures without reading and writing the whole thing, in which case you'd be better off in terms of I/O costs just evacuating the device in question.