[mythtv-users] Fragmentation On Recording Disk?
Matt Doran
matt.doran at papercut.biz
Wed Apr 4 11:33:31 UTC 2007
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
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