[mythtv-users] Storing recordings on network share

sususu xunspam-sususu at yahoo.com
Sun Sep 25 09:49:40 UTC 2011

im using XFS and though i have to admit i sometimes(random once a 2 months on my "big" system)  have a uncleared recorder failure 
especially recording 4(sometimes more) programs in parallel at  maybe 3 MBit/s per stream works fine with allocsize 512MB and a cheap segate 1TB 

(also with the system on the same disk but different partition and using almost no swap with 2GB RAM)

however i also use NFS to give the old system the possibility to access the recordings of the big system too. 

though i don't record through it a major performance drop even when reading can be viewed and even expanding the NFS buffering does not get rid of it completely
when working with NFS one can see that accessing files only partially and not reading through causes some stuttering too as with many small files 
this would either call for a "temporary file" (Buffer) stored locally and feed through the NFS in a constant stream or use of a different networkFF (both some options i have not evaluated yet completely)

Von: Gary Buhrmaster <gary.buhrmaster at gmail.com>
An: Discussion about MythTV <mythtv-users at mythtv.org>
Gesendet: 20:02 Samstag, 24.September 2011 
Betreff: Re: [mythtv-users] Storing recordings on network share

On Sat, Sep 24, 2011 at 10:37, belcampo <belcampo at zonnet.nl> wrote:
> If you use xfs with with allocsize=1024M, one can easy avoid most of the
> randomness of videofile-writes and thereby avoiding allmost if not all
> of the mentioned troubles.

Yes, and no.  Using any extent based file system will reduce the
file fragmentation (which is generally a good thing), and reduce
the ongoing allocation overheads (also a good thing).  But if you have
multiple files open for writing, you will still be seeking from one file
extent to another as each files chunks are written.  As always, your
particular usage and results will vary.
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