On 09/22/2013 02:12 AM, yy-nm wrote:
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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well, pg_num as the total num of pgs, and pgp_num means the num of pgs
which are used now
The reference
you can reference on http://ceph.com/docs/master/rados/operations/pools/#create-a-pool
the description of pgp_num
simply says pgp_num is:
> The total number of placement groups for placement purposes.
Why is the number of placement groups different from the number of
placement groups for placement purposes?
When would you want them to be different?
Thank you for helping me understand this.
Cheers,
-Gaylord
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