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

[Henk D. Schoneveld]

On 30 Jun 2015, at 16:47, Michael Watson <michael at thewatsonfamily.id.au> wrote:

> 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.
BTW xfs has defragmentation utility package xfsdump. xfs_fsr is the application name.
Used xfs  for more then 7 years, had outages, and never had any problem with rebuilding. This rebuilding also is extremely fast.
> 
>> 
>> Thanks,
>> Richard
>> 
>> 
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