Hi,
YMMV, riddled with assumptions (image is image-format=2, has one ext4
filesystem, no partition table, ext4 superblock starts at 0x400 and
probably a whole boatload of other stuff, I don't know when ext4
updates s_wtime
of it's superblock, nor if it's actually the superblock last write or last
write to filesystem, etc.).
rados -p rbd get $(rbd info $SOME_IMAGE_NAME | awk '/block_name_prefix/ {
print $2 }').0000000000000000 - | dd if=/dev/stdin of=/dev/stdout skip=1072
bs=1 count=4 status=none | perl -lane 'print scalar localtime unpack "I*",
$_;'
Cheers,
KJ
On Fri, Mar 24, 2017 at 12:27 AM, Dongsheng Yang <
dongsheng.y...@easystack.cn> wrote:
> Hi jason,
>
> do you think this is a good feature for rbd?
> maybe we can implement a "rbd stat" command
> to show atime, mtime and ctime of an image.
>
> Yang
>
>
> On 03/23/2017 08:36 PM, Christoph Adomeit wrote:
>
>> Hi,
>>
>> no i did not enable the journalling feature since we do not use mirroring.
>>
>>
>> On Thu, Mar 23, 2017 at 08:10:05PM +0800, Dongsheng Yang wrote:
>>
>>> Did you enable the journaling feature?
>>>
>>> On 03/23/2017 07:44 PM, Christoph Adomeit wrote:
>>>
>>>> Hi Yang,
>>>>
>>>> I mean "any write" to this image.
>>>>
>>>> I am sure we have a lot of not-used-anymore rbd images in our pool and
>>>> I am trying to identify them.
>>>>
>>>> The mtime would be a good hint to show which images might be unused.
>>>>
>>>> Christoph
>>>>
>>>> On Thu, Mar 23, 2017 at 07:32:49PM +0800, Dongsheng Yang wrote:
>>>>
>>>>> Hi Christoph,
>>>>>
>>>>> On 03/23/2017 07:16 PM, Christoph Adomeit wrote:
>>>>>
>>>>>> Hello List,
>>>>>>
>>>>>> i am wondering if there is meanwhile an easy method in ceph to find
>>>>>> more information about rbd-images.
>>>>>>
>>>>>> For example I am interested in the modification time of an rbd image.
>>>>>>
>>>>> Do you mean some metadata changing? such as resize?
>>>>>
>>>>> Or any write to this image?
>>>>>
>>>>> Thanx
>>>>> Yang
>>>>>
>>>>>> I found some posts from 2015 that say we have to go over all the
>>>>>> objects of an rbd image and find the newest mtime put this is not a
>>>>>> preferred solution for me. It takes to much time and too many system
>>>>>> resources.
>>>>>>
>>>>>> Any Ideas ?
>>>>>>
>>>>>> Thanks
>>>>>> Christoph
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> ceph-users mailing list
>>>>>> ceph-users@lists.ceph.com
>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>>>>
>>>>>>
>
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>
--
Kjetil Joergensen <kje...@medallia.com>
SRE, Medallia Inc
Phone: +1 (650) 739-6580
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