Thank Josh for sharing the idea.
I have try the command for calculating the block size by ' sudo rbd diff PoolName/ImageName |awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }''. It seems take much time even to 1-2 minutes.
I think it's not suitable for production environment.
WD
-----Original Message-----
From: Josh Durgin [mailto:jdurgin@xxxxxxxxxx]
Sent: Wednesday, January 13, 2016 2:44 PM
To: Wido den Hollander; WD Hwang/WHQ/Wistron; ceph-users@xxxxxxxxxxxxxx
Subject: Re: How to check the block device space usage
On 01/12/2016 10:34 PM, Wido den Hollander wrote:
> On 01/13/2016 07:27 AM, WD_Hwang@xxxxxxxxxxx wrote:
>> Thanks Wido.
>> So it seems there is no way to do this under Hammer.
>>
>
> Not very easily no. You'd have to count and stat all objects for a RBD
> image to figure this out.
For hammer you'd need another loop and sum around this:
http://permalink.gmane.org/gmane.comp.file-systems.ceph.user/3684
Josh
>> WD
>>
>> -----Original Message-----
>> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf
>> Of Wido den Hollander
>> Sent: Wednesday, January 13, 2016 2:19 PM
>> To: ceph-users@xxxxxxxxxxxxxx
>> Subject: Re: How to check the block device space usage
>>
>> On 01/13/2016 06:48 AM, WD_Hwang@xxxxxxxxxxx wrote:
>>> Hi,
>>>
>>> Is there any way to check the block device space usage under the
>>> specified pool? I need to know the capacity usage. If the block
>>> device is used over 80%, I will send an alert to user.
>>>
>>
>> This can be done in Infernalis / Jewel, but it requires new RBD features.
>>
>> It needs the fast-diffv2 feature iirc.
>>
>>>
>>>
>>> Thanks a lot!
>>>
>>>
>>>
>>> Best Regards,
>>>
>>> WD
>>>
>>>
>>>
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>>
>> --
>> Wido den Hollander
>> 42on B.V.
>> Ceph trainer and consultant
>>
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