[zfs-discuss] How many disk in one pool
delphij at delphij.net
Fri Oct 5 21:11:03 UTC 2012
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On 10/05/12 13:57, Albert Shih wrote:
> Hi all,
> I'm actually running ZFS under FreeBSD. I've a question about how
> many disks I «can» have in one pool.
> At this moment I'm running with one server (FreeBSD 9.0) with 4
> MD1200 (Dell) meaning 48 disks. I've configure with 4 raidz2 in the
> pool (one on each MD1200)
> On what I understand I can add more more MD1200. But if I loose one
> MD1200 for any reason I lost the entire pool.
> In your experience what's the «limit» ? 100 disk ?
> How FreeBSD manage 100 disk ? /dev/da100 ?
We have real system equipped with even more than 100 disks and yes,
the devices would be named after their numbers.
One thing that you need to keep in mind: if you don't use the
zpool.cache and there are a lot of disks, the current implementation
could take very long (like several tens of minutes) for the system to
import the pool.
Another consideration is that larger pools are more vulnerable to
damages: should one vdev fails, the whole pool is gone. So make sure
you have sufficient redundancy on every vdevs and keep in mind that
your JBOD chassis, cable, adapters are all points of failures.
Xin LI <delphij at delphij.net> https://www.delphij.net/
FreeBSD - The Power to Serve! Live free or die
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