[mythtv-users] WD Red 2TB x4 mdadm RAID 10 XFS -- Jumpy 1080p playback

[Juhani Rautiainen]

On Sun, Aug 18, 2013 at 3:12 PM, Kevin Calvert <kevin at eleventhree.com> wrote:
> Simply put, I previously just used single drives (WD Green) to store my
> video collection but after experiencing a few drive failures I moved to a
> RAID 10 setup for a little more redundancy.
>
> However, I have noticed that when playing back 1080p videos (720p doesn't
> show this problem) it becomes unstable enough that I need to do something
> about it. Occasionally it will pause completely for a second but it seems
> like every 5 minutes, or so, a video frame or two will just stutter while
> the audio drops out completely for about 5 seconds.
>
>
>
> kevin at tobias:~$ cat /etc/fstab|grep md1
> /dev/md1                                        /storage        xfs
> rw,user,auto            0       0
>
> I appreciate any insight...

I use these with xfs:

/dev/sdb3       /storafe  xfs     noatime,nodiratime,allocsize=512m

I don't see point recording access times on storage volume. Have you
used iostat to check if it's read or writes which cause the stalls?
Which IO scheduler do you use?

> Kevin
> eleventhree.com

-Juhani
-- 
Juhani Rautiainen                                   jrauti at iki.fi