Re: Full OSD questions

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On 2013/9/10 6:38, Gaylord Holder wrote:
Indeed, that pool was created with the default 8 pg_nums.

8 pg_num * 2T/OSD / 2 repl ~ 8TB which about how far I got.

I bumped up the pg_num to 600 for that pool and nothing happened.
I bumped up the pgp_num to 600 for that pool and ceph started shifting things around.

Can you explain the difference between pg_num and pgp_num to me?
I can't understand the distinction.

Thank you for your help!

-Gaylord

On 09/09/2013 04:58 PM, Samuel Just wrote:
This is usually caused by having too few pgs.  Each pool with a
significant amount of data needs at least around 100pgs/osd.
-Sam

On Mon, Sep 9, 2013 at 10:32 AM, Gaylord Holder <gholder@xxxxxxxxxxxxx> wrote:
I'm starting to load up my ceph cluster.

I currently have 12 2TB drives (10 up and in, 2 defined but down and out).

rados df

says I have 8TB free, but I have 2 nearly full OSDs.

I don't understand how/why these two disks are filled while the others are
relatively empty.

How do I tell ceph to spread the data around more, and why isn't it already
doing it?

Thank you for helping me understand this system better.

Cheers,
-Gaylord
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you can reference on http://ceph.com/docs/master/rados/operations/pools/#create-a-pool
the description of pgp_num
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