[zfs-discuss] maximum number of vdevs

Gordan Bobic gordan.bobic at gmail.com
Fri Apr 15 08:57:19 EDT 2016


Which is fine - right up to the point where you need to restore the whole
system from a backup for some reason. Unlikely perhaps, but on a long
enough timeline it will happen.

On Fri, Apr 15, 2016 at 1:55 PM, Michael Ver Haag via zfs-discuss <
zfs-discuss at list.zfsonlinux.org> wrote:

> I agree with this that you need to consider your usage case.
>
> In our case we had lots of disk not much server and a demand for large
> contiguous rock solid storage.
>
> We have set up multipath with 480 disks in 8 enclosures
>
> Configured four zpools with 15 disk from each JBOD with 15 vdevs(one from
> each enclosure) per pool  in a raidz2.
>
> This way we can lose 2 entire enclosures and not loose data in any of the
> 4 321 TB pools
>
> While getting a good portion of the performance available.
>
> There is not a lot of talk out on the internet about best practices for
> how to deal with these large pools.
>
>
>
> Michael
>
>
>
> *From:* zfs-discuss [mailto:zfs-discuss-bounces at list.zfsonlinux.org] *On
> Behalf Of *Chris Najmi via zfs-discuss
> *Sent:* Tuesday, April 12, 2016 10:45 AM
> *To:* zfs-discuss at list.zfsonlinux.org; Jason Kiebzak <jkiebzak at gmail.com>
> *Subject:* Re: [zfs-discuss] maximum number of vdevs
>
>
>
> Short - through standard SAS expanders you can certainly add huge numbers
> of disks to a zpool.
>
> Long - I would refer you to entry 16 here titles "just because you can
> should you?"
>
> http://nex7.blogspot.com/2013/03/readme1st.html?m=1
>
> Zfs has virtually no limits. That doesn't mean you can throw garbage
> design at it and come away smelling nice. Do you actually need 300+ raw
> disks in one file system? In one zpool?
>
> ZFS wont stop you, but you're treading a line between scale-up and
> scale-out, and there are other things that might not react well to scaling
> up other than your file system. As the previous poster mentioned, network
> bandwidth for a restore from backup is probably a more appropriate limit
> you want to build around.
> ------------------------------
>
> *From: *Jason Kiebzak via zfs-discuss <zfs-discuss at list.zfsonlinux.org>
> *Sent: *‎4/‎12/‎2016 9:59 AM
> *To: *zfs-discuss at list.zfsonlinux.org
> *Subject: *[zfs-discuss] maximum number of vdevs
>
> I am looking at adding several JBOD units to our file server, and then
> adding the drives to our zpool - in multiple configuration (mirrored,
> raidz3, etc).
>
>
>
> How many vdevs / disks can be added to a zpool - can I add 300 disks? more?
>
> Thanks
>
> Jason
>
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