Re: location-aware file placement in Ceph

[xiao xianxia <xianxiaxiao@ubuntukylin.com>]

Hi Zhongliang,
     you can find a lot of command on ceph official document!


于 2014/4/10 0:57, Zhongliang Zhao 写道:
> Hi XIanxia,
>
> Thanks a lot for the reply.
>
> Since I am new to ceph, some parts of your reply is unclear to me. Is 
> it possible for you to make it more clear? Thanks a lot for your time.
>
> On 02/28/2014 02:41 AM, Xianxia Xiao wrote:
>>
>> May be able to meet your needs through rbd.
>>
>>
>> You can create multiple rules,and then specify a different pool to 
>> use a different ruleset.
> Where can I modify or creat the rule? On the monitor node? and how to 
> configure a pool to use a ruleset?
you can use crushtool export crush map,then modify the rule in crush map 
,you can create new rules.
http://ceph.com/docs/master/rados/operations/crush-map/?highlight=crush%20map

you can use #ceph osd pool set {pool name} {key} {value}
the key is crush_ruleset,value is the rule num.
>> Then create multiple block images, and Specify image to different pools.
> How this can be done?

you can see that in Block Device Command in ceph document.
http://ceph.com/docs/master/rbd/rados-rbd-cmds/

>> create  file system on the block device and mount file system on 
>> different positions,so that the different location of the file can 
>> use different ruleset.
> How do I know to where I should mount the file system?
You decide,mount command is the same to linux mount command.

>
> Best regards,
> Zhongliang Zhao
>>
>>
>>
Best regards,
xian xia
>>
>>
>>
>>
>>
>>> -----原始邮件-----
>>> 发件人: Zhongliang Zhao<zhaozhongliang@gmail.com>
>>> 发送时间: 2014年2月27日 星期四
>>> 收件人: ceph-devel@vger.kernel.org
>>> 抄送:
>>> 主题: location-aware file placement in Ceph
>>>
>>> Dear all,
>>>
>>> As new to ceph, may I ask in the crush algorithm, is there a way to
>>> configure where the file to be stored, not randomly.
>>> My requirement is to place the files that within the same
>>> location(within a geographic area), into the same OSD, instead of
>>> randomly placing them seperately.
>>>
>>> I guess crush may support this. But to do this, I just have to 
>>> configure
>>> some parameters in some ceph commands? or I have to modify the ceph
>>> crush algorithm and re-compile ceph?
>>>
>>> Many thanks for any helpful pointers.
>>>
>>> Cheers, Giovanni
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>>
>

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