Updating the pg and pgp values

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So, if it doesn?t refer to the entry in ceph.conf. Where does it actually store the new value?

?Jiten

On Sep 8, 2014, at 10:31 AM, Gregory Farnum <greg at inktank.com> wrote:

> On Mon, Sep 8, 2014 at 10:08 AM, JIten Shah <jshah2005 at me.com> wrote:
>> While checking the health of the cluster, I ran to the following error:
>> 
>> warning: health HEALTH_WARN too few pgs per osd (1< min 20)
>> 
>> When I checked the pg and php numbers, I saw the value was the default value
>> of 64
>> 
>> ceph osd pool get data pg_num
>> pg_num: 64
>> ceph osd pool get data pgp_num
>> pgp_num: 64
>> 
>> Checking the ceph documents, I updated the numbers to 2000 using the
>> following commands:
>> 
>> ceph osd pool set data pg_num 2000
>> ceph osd pool set data pgp_num 2000
>> 
>> It started resizing the data and saw health warnings again:
>> 
>> health HEALTH_WARN 1 requests are blocked > 32 sec; pool data pg_num 2000 >
>> pgp_num 64
>> 
>> and then:
>> 
>> ceph health detail
>> HEALTH_WARN 6 requests are blocked > 32 sec; 3 osds have slow requests
>> 5 ops are blocked > 65.536 sec
>> 1 ops are blocked > 32.768 sec
>> 1 ops are blocked > 32.768 sec on osd.16
>> 1 ops are blocked > 65.536 sec on osd.77
>> 4 ops are blocked > 65.536 sec on osd.98
>> 3 osds have slow requests
>> 
>> This error also went away after a day.
>> 
>> ceph health detail
>> HEALTH_OK
>> 
>> 
>> Now, the question I have is, will this pg number remain effective on the
>> cluster, even if we restart MON or OSD?s on the individual disks?  I haven?t
>> changed the values in /etc/ceph/ceph.conf. Do I need to make a change to the
>> ceph.conf and push that change to all the MON, MSD and OSD?s ?
> 
> It's durable once the commands are successful on the monitors. You're all done.
> -Greg
> Software Engineer #42 @ http://inktank.com | http://ceph.com
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