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

[Stuart Auchterlonie]

On 01/07/15 08:43, Andre Newman wrote:
> 
> On 1 Jul 2015, at 07:04, Mike Holden <mikeholden99+mythtv at gmail.com> wrote:
> 
>> What about the current batch of "surveilance" HDDs? They sound like a similar use-case to MythTV program recording.
>>
>> Anyone tried them, or have any opinions on them? Or is it just a marketing gimmick to add a few dollars on to the price of a regular drive?
>>
>> E.g. http://www.mwave.com.au/product/seagate-st4000vx000-4tb-surveillance-hdd-35-sata3-surveillance-hard-drive-ab58829
> 
> I have one of these, this is Seagate’s version of the WD AV-GP, I think the newer WD’s are rebranded as WD Purple.
> 
> These are exactly the kind of drive I was advocating a few mails back, Surveillance, Cinema, AV, whatever it’s called.
> 
> Supposedly one of the optimisations (in the WD at least) is that during a bad read a desktop drive will go back and retry multiple times to try to get a good read, in the process holding up any further reads. The AV drive will carry on and deliver the read with a few errors, the idea is that as the data is video the odd bad bit here and there is masked by the video codec and holding up the read for a one or two bit error is more detrimental than the errors would be.
> 
> I think it’s important to not use these drives for OS or other regular data!
> 

Yeah, the variations are in how the firmware handles stuff like errors.
Desktop drives tend to retry and try to find your data, while an
enterprise / NAS rated drive is designed to run as part of a RAID set
and should return immediately to let the upper layers know to retry
from another part of the raid set.

Regards
Stuart