[mythtv-users] EXT3 on Software RAID5 optimization

[David Brodbeck]

Guillaume Laurès wrote:
> The problem lies with block allocation. Something with NFS prevent XFS  
> to do a good job and the file system gets awfully fragmented with only  
> a few tens of recordings. It's a known problem of XFS when using NFS,  
> and it seems not to have any solution.

Have you tried adding something like 'allocsize=512m' to your mount 
options?  This tells XFS to preallocate 512 megabytes of space when 
writing to a file, instead of the default of 64 kilobytes.  I found it 
greatly reduced fragmentation on my Myth system, but I'm not using NFS 
heavily.