Xserve RAID, xfs, linux, and VERY slow deletes

Greetings,
We're running a linux box with kernel 2.6.22-2-amd64 on dual AMD Opteron Processors with 8G ram. We have two xserve raids mounted on this box: one with 4.1T (called gala) and another with 1.9T (called apple). We serve these disks to other boxen via nfs.
I have a series of large files (about 5G each) that I want to delete from the disk apple. I ssh to the machine to which the disks are attached (ie not via nfs). I change into the directory where the disk is mounted and sudo rm -rf *.gz. The first cpu on the box goes to 100% and it takes something like 15 minutes to delete EACH 5G file.
I've googled around but found no solution as to why this is hapening or what I can do about it.
The disk is mounted with no options:
/dev/sdd1 on /storage/disks/apple type xfs (rw)
Can someone help?
Thanks!

The depth of this directory is 1. That is:
dir$ ls -1
bigfile1.gz
bigfine2.gz
dir$
There are no subdirectories.
dir$ rm bigfile1.gz
takes about 10 minutes where bigfile1.gz is about 5GB in size.
I have not done the math to decide if the time is proportional to size because I wasn't sure how xfs deals with sparse files.
Thanks for any help anybody can provide.
Chad Matsalla

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