Has anyone seen this before? I've got a raid 5 mounted on my server and for whatever reason it started showing this:

jason@box2:/mnt/raid1/cra$ ls -alh
ls: cannot access e6eacc985fea729b2d5bc74078632738: Input/output error
ls: cannot access 257ad35ee0b12a714530c30dccf9210f: Input/output error
total 0
drwxr-xr-x 5 root root 123 2009-08-19 16:33 .
drwxr-xr-x 3 root root  16 2009-08-14 17:15 ..
?????????? ? ?    ?      ?                ? 257ad35ee0b12a714530c30dccf9210f
drwxr-xr-x 3 root root  57 2009-08-19 16:58 9c89a78e93ae6738e01136db9153361b
?????????? ? ?    ?      ?                ? e6eacc985fea729b2d5bc74078632738

The md5 strings are actual directory names and not part of the error. The question marks are odd, and any directory with a question mark throws an io error when you attempt to use/delete/etc it.

I was unable to umount the drive due to "busy". Rebooting the server "fixed" it but it was throwing some raid errors on shutdown. I have configured two raid 5 arrays and both started doing this on random files. Both are using the following config:

mkfs.xfs -l size=128m -d agcount=32
mount -t xfs -o noatime,logbufs=8

Nothing too fancy, but part of an optimized config for this box. We're not partitioning the drives and that was suggested as a possible issue. Could this be the culprit?