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Description of problem:
Maxtor 13g 91360U4 udma66

Partitioned disk into 4. 1 swap and 3 ext. Mounted under /new-disk as /home,/boot,/.
I am having problems transfering my file system from disk 1 (hdb udma100) to
disk 2 (hdc). cp -a hangs under apparently random conditions. A look
at ps shows that cp in waiting_on_buffer and other processes such as
kupdated are in "D" state. The hard drive light stays on and,
obviously, any other commands issued after that, that need to write to
hdc hang. The rest of the system runs fine.

No errors reported in logs. Kernel seems to identify the drive correctly.

I reformat disk2's partitions to be ext2 instead of ext3. This time
copying worked perfectly until /var. cp hangs again but this
time with get_request in ps. Entire system crashed once.

Even in cp -a's that were successful I notice that there were files missing.

Version-Release number of selected component (if applicable):

Drive tested on windows 98 machine with no problems.

How reproducible:
Sometimes

Steps to Reproduce:
1.mount partitions
2.cp -a /home /new-disk/
3.
    

Actual Results:  hangs... ps shows wait_on_buffer

Expected Results:  complete copy

Additional info:

kernel 2.4.18-14
ide0 master 13g Western Dig
slave 60 gig Western D.
ide1 maxtor 13 gig
gigabit mother board 6vxc7-4x
chipset via vt82c686b
IDE UMDA100 controlller on pci00:07.1
800 mhz celeron 192mb mem