Re: preallocation

[Ying-Hung Chen <ying@xxxxxxxxxxxxxx>]

> It truncates it. IOWS, it throws away the prealloc you did externally
> to this program. You need to do the preallocation after the truncation
> but before you start writing.
> 
> Cheers,
> 
> Dave.

Thanks Dave, now it seems to work!! just out of curiosity, when i run
xfs_bmap on each file, it shows

00001.ivf:
        0: [0..106495]: 96..106591

which is cool,

but when i do xfs_db -r /dev/hdb4
and check the fragementation status, it shows

[root@localhost tmp]# xfs_db -r /dev/hdb4
xfs_db> frag
actual 1763, ideal 902, fragmentation factor 48.84%

where are all the fragments coming from? do I need to worry about it?

thanks,

-Ying