Re: Experience with 5k RPM/archive HDDs

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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/
    > _______________________________________________
    > ceph-users mailing list
    > ceph-users@xxxxxxxxxxxxxx
    > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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