Hi,
As far as I know Ceph won't attempt to do any weight modifications. If
you use the default CRUSH map, every devices get a default weight of
1. However this value can be modified while the cluster runs. Simply
update the CRUSH map like so:
# ceph osd crush reweight {name} {weight}
If you need more input, have a look at the documentation ;-)
http://ceph.com/docs/master/rados/operations/crush-map/?highlight=crush#adjust-an-osd-s-crush-weight
Cheers,
--
Regards,
Sébastien Han.
On Wed, Feb 13, 2013 at 4:23 PM, sheng qiu <herbert1984106@xxxxxxxxx> wrote:
> Hi Gregory,
>
> once running ceph online, will ceph change the weight dynamically (if
> not set properly) or it can only be changed by the user through
> command line or it cannot be changed online?
>
> Thanks,
> Sheng
>
> On Mon, Feb 11, 2013 at 3:31 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote:
>> On Mon, Feb 11, 2013 at 12:43 PM, Holcombe, Christopher
>> <cholcomb@xxxxxxxxxxx> wrote:
>>> Hi Everyone,
>>>
>>> I just wanted to confirm my thoughts on the ceph osd weightings. My understanding is they are a statistical distribution number. My current setup has 3TB hard drives and they all have the default weight of 1. I was thinking that if I mixed in 4TB hard drives in the future it would only put 3TB of data on them. I thought if I changed the weight to 3 for the 3TB hard drives and 4 for the 4TB hard drives it would correctly use the larger storage disks. Is that correct?
>>
>> Yep, looks good.
>> -Greg
>> PS: This is a good question for the new ceph-users list.
>> (http://ceph.com/community/introducing-ceph-users/)
>> :)
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>
>
>
> --
> Sheng Qiu
> Texas A & M University
> Room 332B Wisenbaker
> email: herbert1984106@xxxxxxxxx
> College Station, TX 77843-3259
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