On Wed, Jan 26, 2011 at 10:49:03PM -0500, Mark Lord wrote: > On 11-01-26 10:30 PM, Dave Chinner wrote: > > [Please cc xfs@xxxxxxxxxxx on XFS bug reports. Added.] > > > > On Wed, Jan 26, 2011 at 08:22:25PM -0500, Mark Lord wrote: > >> Alex / Christoph, > >> > >> My mythtv box here uses XFS on a 2TB drive for storing recordings and videos. > >> It is behaving rather strangely though, and has gotten worse recently. > >> Here is what I see happening: > >> > >> The drive mounts fine at boot, but the very first attempt to write a new file > >> to the filesystem suffers from a very very long pause, 30-60 seconds, during which > >> time the disk activity light is fully "on". > > > > Please post the output of xfs_info <mtpt> so we can see what you > > filesystem configuration is. > > /dev/sdb1 on /var/lib/mythtv type xfs > (rw,noatime,allocsize=64M,logbufs=8,largeio) > > [~] xfs_info /var/lib/mythtv > meta-data=/dev/sdb1 isize=256 agcount=7453, agsize=65536 blks > = sectsz=512 attr=2 > data = bsize=4096 blocks=488378638, imaxpct=5 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 > log =internal bsize=4096 blocks=32768, version=2 > = sectsz=512 sunit=0 blks, lazy-count=0 > realtime =none extsz=4096 blocks=0, rtextents=0 7453 AGs means that the first write coud cause up to ~7500 disk reads to occur as the AGF headers are read in to find where the best free space extent for allocation lies. That'll be your problem. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
