[mythtv-users] What is best filesystem for recordings?

[Michael Watson]

On 30/06/2015 11:51 PM, Richard Shaw wrote:
> On Tue, Jun 30, 2015 at 8:26 AM, Tim Draper <veehexx at zoho.com 
> <mailto:veehexx at zoho.com>> wrote:
>
>     i tried BTRFS about 9 months ago but found it to struggle under
>     load. i moved from btrfs to jfs/xfs (i forget which) and it was a
>     very noticeable improvement. I was having some BTRFS performance
>     issues which i assumed was down to the mythtv media partition. I
>     suspect i used XFS as i don't think JFS is natively out-the-box
>     supported under Fedora which i now use.
>     Currently on ext4 that I've had 4 streams going to it (3x HD
>     record, 1x HD livetv) and it didnt have any obvious visuals
>     issues. 2disk mdadm raid1, LVM with 3x ext4 partitions.
>
>
> I'm not sure which Fedora release started support for JFS but it has 
> been there for quite some time...
>
> Adding my own $.02... Back when I only had a 500GB recording drive and 
> a 2-tuner HDHR ATSC tuner I tried XFS, JFS, and EXT4 but I couldn't 
> tell any difference, my system simply wasn't demanding enough to 
> matter, so I settled on EXT4 since it's the default for Fedora.
>
> I now have a 2TB recording drive and added a 3 tuner HDHR Prime... 
> Still on the recording side not very demanding, I don't have a bunch 
> of simultaneous recordings but one thing I have noticed is a large lag 
> (up to 10 seconds?) of lag between when I hit play and the recording 
> actually starts playing.
>
> It's annoying but not bad enough to take drastic measures but it would 
> be nice to know if changing file system types would fix this.
This can be due to the recordedseek table in the db becoming fragmented, 
a (fairly) recent commit added a sort/defragment of the recordedseek 
table to the optimize_mythdb.pl script, which fixed this problem on my 
system.

>
> Thanks,
> Richard
>
>
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