On Wed, Aug 12, 2009 at 09:53, Goswin von Brederlow<goswin-v-b@xxxxxx> wrote: > With how many devices does the MTBFS of > a raid6 drop below that of a single disk? Four devices. The more important thing to worry about is running in to an uncorrectable error during rebuild, twice during the same rebuild. I'd say a good rule of thumb is no more than 8TB in a RAID5 array; 16TB in a raid6 array if you want to remain very safe. YMMV. Your risk comfort and willingness to restore from backups will vary as well. -- 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