[ceph-users] 答复: Re: Luminous LTS: `ceph osd crush class create` isgone?

Caspar Smit casparsmit at supernas.eu
Mon Nov 6 02:30:10 PST 2017


"That is not true. "ceph osd crush set-device-class" will fail if the input
OSD has already been assigned a class. Instead you should do "ceph osd
crush rm-device-class" before proceeding."

You are absolutely right, sorry for the confusion!

Caspar

2017-11-04 2:22 GMT+01:00 <xie.xingguo at zte.com.cn>:

> > With the caveat that the "ceph osd crush set-device-class" command only
> works on existing OSD's which already have a default assigned class so you
> cannot plan/create your classes before > adding some OSD's first.
> > The "ceph osd crush class create" command could be run without any OSD's
> configured.
>
>
> That is not true. "ceph osd crush set-device-class" will fail if the
> input OSD has already been assigned a class. Instead you should do "ceph
> osd crush rm-device-class" before proceeding.
>
> Generally you don't have to pre-create an empty class and associate some
> specific OSDs with that class through  "ceph osd crush set-device-class"
> later, as the command will automatically create it if it does not exist.
>
> Also you can simply disable the "auto-class" feature by setting
> "osd_class_update_on_start" to false, and then newly created OSDs will be
> bound to no class(e.g., hdd/ssd).
>
> Otherwise you have to do "ceph osd crush rm-device-class" before you can
> safely reset OSDs' class to any freeform as you wish.
>
>
>
>
>
>
> 原始邮件
> *发件人:* <casparsmit at supernas.eu>;
> *收件人:* <ceph-users at lists.ceph.com>;
> *日 期 :*2017年11月03日 17:41
> *主 题 :**Re: [ceph-users] Luminous LTS: `ceph osd crush class create`
> isgone?*
>
>
> 2017-11-03 7:59 GMT+01:00 Brad Hubbard <bhubbard at redhat.com>:
>
>> On Fri, Nov 3, 2017 at 4:04 PM, Linh Vu <vul at unimelb.edu.au> wrote:
>> > Hi all,
>> >
>> >
>> > Back in Luminous Dev and RC, I was able to do this:
>> >
>> >
>> > `ceph osd crush class create myclass`
>>
>> This was removed as part of https://github.com/ceph/ceph/pull/16388
>>
>> It looks like the set-device-class command is the replacement or
>> equivalent..
>>
>>
>> $ ceph osd crush class ls
>> [
>>     "ssd"
>> ]
>>
>> $ ceph osd crush set-device-class myclass 0 1
>>
>> $ ceph osd crush class ls
>> [
>>     "ssd",
>>     "myclass"
>> ]
>>
>>
> With the caveat that the "ceph osd crush set-device-class" command only
> works on existing OSD's which already have a default assigned class so you
> cannot plan/create your classes before adding some OSD's first.
> The "ceph osd crush class create" command could be run without any OSD's
> configured.
>
> Kind regards,
> Caspar
>
> >
>> >
>> > so I could utilise the new CRUSH device classes feature as described
>> here:
>> > http://ceph.com/community/new-luminous-crush-device-classes/
>> >
>> >
>> >
>> > and in use here:
>> > http://blog-fromsomedude.rhcloud.com/2017/05/16/Luminous-
>> series-CRUSH-devices-class/
>> >
>> >
>> > Now I'm on Luminous LTS 12.2.1 and my custom device classes are still
>> seen
>> > in:
>> >
>> >
>> > `ceph osd crush class ls`
>> >
>> >
>> > `ceph osd tree` and so on. The cluster is working fine and healthy.
>> >
>> >
>> > However, when I run `ceph osd crush class create myclass2` now, it
>> tells me
>> > the command doesn't exist anymore.
>> >
>> >
>> > Are we not meant to create custom device classes anymore?
>> >
>> >
>> > Regards,
>> >
>> > Linh
>> >
>> >
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users at lists.ceph.com
>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >
>>
>>
>>
>> --
>> Cheers,
>> Brad
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users at lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
>
>
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