Hi,
Interesting feedback!
> In my opinion the SMR can be used exclusively for the RGW.
> Unless it's something like a backup/archive cluster or pool with little to none concurrent R/W access, you're likely to run out of IOPS (again) long before filling these monsters up.
That’s exactly the use case I am considering those archive HDDs for: something like AWS Glacier, a form of offsite backup probably via radosgw. The classic Seagate enterprise class HDD provide “too much” performance for this use case, I could live with ¼ of the performance for that price point.
Cheers,
Maxime
On 03/02/17 09:40, "ceph-users on behalf of Wido den Hollander" <ceph-users-bounces@xxxxxxxxxxxxxx on behalf of wido@xxxxxxxx> wrote:
> Op 3 februari 2017 om 8:39 schreef Christian Balzer <chibi@xxxxxxx>:
>
>
>
> Hello,
>
> On Fri, 3 Feb 2017 10:30:28 +0300 Irek Fasikhov wrote:
>
> > Hi, Maxime.
> >
> > Linux SMR is only starting with version 4.9 kernel.
> >
> What Irek said.
>
> Also, SMR in general is probably a bad match for Ceph.
> Drives like that really want to be treated more like a tape than anything
> else.
>
Yes, they are damn slow.
>
> In general, do you really need all this space, what's your use case?
>
> Unless it's something like a backup/archive cluster or pool with little to
> none concurrent R/W access, you're likely to run out of IOPS (again) long
> before filling these monsters up.
>
I fully agree. These large disks have very low IOps specs and will probably work very, very bad with Ceph.
Wido
> Christian
> >
> > С уважением, Фасихов Ирек Нургаязович
> > Моб.: +79229045757
> >
> > 2017-02-03 10:26 GMT+03:00 Maxime Guyot <Maxime.Guyot@xxxxxxxxx>:
> >
> > > Hi everyone,
> > >
> > >
> > >
> > > I’m wondering if anyone in the ML is running a cluster with archive type
> > > HDDs, like the HGST Ultrastar Archive (10TB@7.2k RPM) or the Seagate
> > > Enterprise Archive (8TB@5.9k RPM)?
> > >
> > > As far as I read they both fall in the enterprise class HDDs so **might**
> > > be suitable for a low performance, low cost cluster?
> > >
> > >
> > >
> > > Cheers,
> > >
> > > Maxime
> > >
> > > _______________________________________________
> > > ceph-users mailing list
> > > ceph-users@xxxxxxxxxxxxxx
> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > >
> > >
>
>
> --
> Christian Balzer Network/Systems Engineer
> chibi@xxxxxxx Global OnLine Japan/Rakuten Communications
> http://www.gol.com/
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