Please review http://docs.ceph.com/docs/master/rados/operations/crush-map/
regarding weights
Best regards,
Alex
On Wed, Sep 23, 2015 at 3:08 AM, wikison <wiki...@163.com> wrote:
> Hi,
> I have four storage machines to build a ceph storage cluster as
> storage nodes. Each of them is attached a 120 GB HDD and a 1 TB HDD. Is it
> OK to think that those storage devices are same when write a ceph.conf?
> For example, when setting *osd pool default pg num* , I thought: *osd
> pool default pg num* = (100 * 8 ) / 3 = 266, where *osd pool default
> size* = 3 and the number of OSDs is 8 (one Daemon per device).
>
> And, when Add the OSD to the CRUSH map so that it can begin
> receiving data. You may also decompile the CRUSH map, add the OSD to the
> device list, add the host as a bucket (if it’s not already in the CRUSH
> map), add the device as an item in the host, assign it a weight, recompile
> it and set it.
> ceph [--cluster {cluster-name}] osd crush add {id-or-name}
> {weight} [{bucket-type}={bucket-name} ...]
> What is the meaning of weight? How should I set it to satisfy my
> hardware condition ?
>
>
>
> --
> Zhen Wang
>
>
>
>
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>
>
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