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.yang@xxxxxxxxxxxx> 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,Do you mean some metadata changing? such as resize?
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.
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
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