[mythtv-users] Fragmentation On Recording Disk?

[Matt Doran]

Tim Phipps wrote:
> On Wednesday 4 April 2007 8:31 am, James Warden wrote:
>   
>> Are disks formatted with
>> ext3 showing the same fragmentation factor ? And does one know the growth
>> rate of this factor ? (what are the relevant variables : disk size ?
>> technology ? file system ?)
>>
>>     
> Using filefrag on my current disk:
> /myth/1028_20070223002400.mpg: 2977 extents found, perfection would be 14 
> extents
> /myth/1028_20070322002900.mpg: 1473 extents found, perfection would be 16 
> extents
> /myth/1032_20070220003400.mpg: 2566 extents found, perfection would be 11 
> extents
>
> I'm in the middle of upgrading my storage and here's what I get on the new 
> disk:
> /mnt/myth/1028_20070223002400.mpg: 30 extents found, perfection would be 14 
> extents
> /mnt/myth/1028_20070322002900.mpg: 33 extents found, perfection would be 16 
> extents
> /mnt/myth/1032_20070220003400.mpg: 22 extents found, perfection would be 11 
> extents
>
>
>
>   
I'm also seeing heavily fragmented transcoded files.    I'm also using 
ext3 on Ubuntu.      Any idea if this causes noticable performance problems?

I tend to see livetv pauses when a transcode complete ... when the 
original file is deleted.  I wonder if this fragmentation could be 
contributing.

I just used the default filesystem when installing Ubuntu.  If I knew 
more about this before starting, I might have tried XFS.   It's a pain 
to change now. :(

Matt
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20070404/ed392c01/attachment.htm