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

Linh Vu vul at unimelb.edu.au
Sun Nov 5 16:15:30 PST 2017


Thanks! It seems less intuitive than crush class create, but should work well enough.

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________________________________
From: ceph-users <ceph-users-bounces at lists.ceph.com> on behalf of xie.xingguo at zte.com.cn <xie.xingguo at zte.com.cn>
Sent: Saturday, November 4, 2017 12:22:31 PM
To: casparsmit at supernas.eu; bhubbard at redhat.com
Cc: ceph-users at lists.ceph.com
Subject: [ceph-users] 答复: Re: Luminous LTS: `ceph osd crush class create` isgone?

> 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<mailto:bhubbard at redhat.com>>:
On Fri, Nov 3, 2017 at 4:04 PM, Linh Vu <vul at unimelb.edu.au<mailto: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/<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/<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
>
>
> _______________________________________________
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>



--
Cheers,
Brad
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