[mythtv-users] random livetv stalls

[Stephen P. Villano]

On 2/23/14, 5:10 AM, Mike Thomas wrote:
> On Sat, 22 Feb 2014 10:29:27 -0800
> Monkey Pet <monkeypet at gmail.com> wrote:
>> On Thu, Feb 20, 2014 at 10:47 AM, Monkey Pet <monkeypet at gmail.com>
>> wrote:
>>
>>> On Wed, Feb 19, 2014 at 3:27 PM, Jean-Yves Avenard
>>> <jyavenard at gmail.com>wrote:
>>>
>>>> On 20 February 2014 08:55, Doug Lytle <support at drdos.info> wrote:
>>>>> What would this have caused?
>>>>>
>>>>> I put the patch into place on my mother's system this morning.
>>> How often are people seeing these stalls in LiveTV? I applied the
>>> patch on my backend and LiveTV seems smooth.  However, I didn't
>>> test the before patch LiveTV, so I don't know if this is an
>>> improvement or not.
>>>
>> I saw a stall after 30 mins using the patch.  It reproduced a few
>> times. The frontend is remote using streaming not nfs.  On the
>> backend side, I am suspecting the btrfs is slowing down the writes,
>> so I am switch back to ext4.
> Dear Monkey and others,
>
> I suggest you switch to xfs (defaults should be fine) for your
> video storage directories. ext4 for video directories has always
> caused stalling on my computers. ext3 is a joke. ext2 can't support
> files large enough. I think trendy new filesystems like btrfs will
> exhibit greater latency than xfs because in general they do more work
> than xfs.
>
> Conversely, xfs is NBG for the database. ext4 seems best for me, but
> some people use ext2. The claimed 'improvement' from ext2 comes from it
> using the drive's write cache in a less than safe manner.
>
> Another show-stopper is RAID. Anyone using RAID 5/6 for either a
> database or video storage (or anything) deserves it.
>
> Yours,
>
> Mike.
> _______________________________________________
>
Interesting! My BE runs the SQL database, Zoneminder, a few other tasks
and is running a RAID 5 array with ext4 fs. Of course, it's a Dell
Poweredge 2850 with perc RAID card installed.
It all depends on what you're running, how you run it and how you tune it.