Re: cephfs: from a file name determine the objects name

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On Tue, 3 Feb 2015, Mudit Verma wrote:
> Hi Sage, 
> Following are the greps through inotify,  I created a file name cris at
> client end 
> 
> From stats the ino number is 1099511628795

100000003fb

The object names will be something like 100000003fb.00000001.  The 
filenames once they hit disk will get the __head_$hash type suffix based 
on a hash of the name and some other random stuff.  I think the __2 is 
the pool id.

sage




> 
> but it does not match to the hex 06E5F474
> 
> 
> On ODS:
> 
> /var/local/osd1/current/2.0_head/ OPEN 200.00000001__head_06E5F474__2
> 
> /var/local/osd1/current/2.0_head/ MODIFY 200.00000001__head_06E5F474__2
> 
> /var/local/osd1/current/2.0_head/ CLOSE_WRITE,CLOSE
> 200.00000001__head_06E5F474__2
> 
> 
> May you please help me understand this name 200.00000001__head_06E5F474__2
> 
> 
> Thanks
> 
> Mudit
> 
> 
> On Sun, Feb 1, 2015 at 10:35 PM, Sage Weil <sage@xxxxxxxxxxxx> wrote:
> 
>       It's inode number (in hex), then ".", then block number (in
>       hex).  You can get the ino of a file with stat.
> 
>       sage
> 
> 
> 
>       On February 1, 2015 5:08:18 PM GMT+01:00, Mudit Verma
>       <mudit.f2004912@xxxxxxxxx> wrote:
>       Hi All, 
> CEPHFS - Given a file name, how can one determine the exact
> location and the name of the objects on OSDs. 
> 
> So far I could understand that the objects data is stored in
> .../current dir in OSDs, but what naming convention do they
> use? 
> 
> Many thanks in advance 
> 
> Thanks
> Mudit
> 
> ____________________________________________________________________________
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> 
> 
> --
> Sent from Kaiten Mail. Please excuse my brevity.
> 
> 
> 
> 
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