> On Mar 3, 2016, at 8:35 PM, Fred Liu <[email protected]> wrote: > > Hi, > > Today when I was reading Jeff's new nuclear weapon -- DSSD D5's CUBIC RAID > introduction, > the interesting survey -- the zpool with most disks you have ever built > popped in my brain.
We test to 2,000 drives. Beyond 2,000 there are some scalability issues that impact failover times. We’ve identified these and know what to fix, but need a real customer at this scale to bump it to the top of the priority queue. > > For zfs doesn't support nested vdev, the maximum fault tolerance should be > three(from raidz3). Pedantically, it is N, because you can have N-way mirroring. > It is stranded if you want to build a very huge pool. Scaling redundancy by increasing parity improves data loss protection by about 3 orders of magnitude. Adding capacity by striping reduces data loss protection by 1/N. This is why there is not much need to go beyond raidz3. However, if you do want to go there, adding raidz4+ is relatively easy. — richard -- [email protected] +1-760-896-4422 ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
