---- Original Message ----- > On 08/06/15 21:28, Pierre Wieser wrote: > > Hi all, > > > > I currently have an almost full RAID 5 built with 4 x 2 TB disks. > > I wonder if it would be possible to migrate it to a bigger RAID 5 > > with 3 x 6TB new disks. > > I'd recommend against it: > > https://en.wikipedia.org/wiki/RAID#Unrecoverable_read_errors_during_rebuild Oop's! I was not conscious at all of this issue. It happens that I am currenly living dangerously as I have another RAID 5 11,5 TB device :( I had already seen various administration issues when the size increases to this level, but I tought this was only an issue regarding the volumes organization (not tought deeply enough, obviously).... Starting from your link, and searching a bit, I understand now that the 10TB is a maximal limit for desktop-grade disks (regarding the URE at least). And thus for any element of a RAID device which needs to be scanned at recovery time. Apart from my poor english, would you say I'm right with this ? Does linux-raid have any recommandation(s) when managing more than 10TB of data ? I may imagine: - several smaller RAID 5 devices - would RAID10 be a valuable solution in your opinion ? (as a precision, all my servers have been migrated to CentOS 7.1) Nonetheless, I thank you very much for the link, which may prevent me to lose a big bunch of data ! > Jan > Pierre -- 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
