I upgraded to 2.6.27-10.  There where otehr upgrade that occured at that time too.  I reformated my array to XFS.  I tried to copy a large amount of data.  It failed in the same mannor.  After reboot, the array is rebuilding, but I found this inthe log:

Dec  6 10:44:54 Server kernel: [44205.953002] Call Trace:
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ac083>] ? find_get_pages+0x43/0x110
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802b6c74>] ? pagevec_lookup+0x24/0x30
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d9302d>] ? xfs_cluster_write+0xad/0x180 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d93598>] ? xfs_page_state_convert+0x498/0x760 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d939c1>] ? xfs_vm_writepage+0x71/0x120 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802b9554>] ? pageout+0x124/0x280
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ab1da>] ? page_waitqueue+0xa/0x90
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802b9b5d>] ? shrink_page_list+0x34d/0x530
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802b9ee2>] ? shrink_inactive_list+0x1a2/0x4b0
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ba26b>] ? shrink_zone+0x7b/0x160
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ba3dd>] ? shrink_zones+0x8d/0x150
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ba526>] ? do_try_to_free_pages+0x86/0x2e0
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ba877>] ? try_to_free_pages+0x67/0x70
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802b9380>] ? isolate_pages_global+0x0/0x50
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802b2b49>] ? __alloc_pages_internal+0x239/0x520
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802d5c6d>] ? alloc_pages_current+0xad/0x110
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ac617>] ? __page_cache_alloc+0x67/0x80
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ad253>] ? __grab_cache_page+0x63/0xb0
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff803171a9>] ? block_write_begin+0x89/0xf0
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d9248a>] ? xfs_vm_write_begin+0x2a/0x30 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d92050>] ? xfs_get_blocks+0x0/0x20 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ab93c>] ? generic_perform_write+0xbc/0x1c0
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ad6a2>] ? generic_file_buffered_write+0x92/0x170
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d9b2f3>] ? xfs_write+0x6b3/0x9b0 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffffa0d96ca8>] ? xfs_file_aio_write+0x58/0x60 [xfs]
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802e9b79>] ? do_sync_write+0xf9/0x140
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff80267050>] ? autoremove_wake_function+0x0/0x40
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff80387071>] ? aa_file_permission+0x21/0xf0
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff80387198>] ? apparmor_file_permission+0x28/0x30
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff80361c46>] ? security_file_permission+0x16/0x20
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ea23b>] ? vfs_write+0xcb/0x130
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff802ea395>] ? sys_write+0x55/0x90
Dec  6 10:44:54 Server kernel: [44205.953002]  [<ffffffff8021285a>] ? system_call_fastpath+0x16/0x1b
Dec  6 10:44:54 Server kernel: [44205.953002]
Dec  6 11:00:09 Server syslogd 1.5.0#2ubuntu6: restart.
Dec  6 11:00:09 Server kernel: Inspecting /boot/System.map-2.6.27-10-generic