[mythtv-users] Recording/playing back same file via NFS

Brad DerManouelian myth at dermanouelian.com
Mon Aug 13 04:28:26 UTC 2007

On Aug 12, 2007, at 8:29 PM, George Mari wrote:

> What's your storage setup like?  How many and what types of drives?
> LVM, Storage groups, RAID?

The drive that contains the recordings is a single 750GB SATA-II  
drive. No LVM, storage groups, or RAID.

> It sounds like you may have more than one drive, and as long as you
> record to one drive and watch from another drive, your fine.  But  
> if you
> are accessing the same drive by simultaneously watching the same
> recording as you record it, you may be going beyond the limits of what
> your single drive can deliver.

I know the drive's limits aren't being reached because I can record 1  
HD + 2 SD recordings and watch HD all at the same time from this one  
drive as long as the HD program I'm watching is not the one that's  
recording. Also, this problem happens when recording only 1 SD  
program locally on the master backend and trying to watch it from the  
remote frontend.

It seems like there's some weird seek latency while reading from and  
writing to the same file over NFS or while streaming from the master  
backend. I was hoping for some magic setting that I missed that would  
improve NFS caching to fix that or whatever.

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