[CentOS] FS problems on Centos4 LVM

I was creating some directories (mkdir xxxx) while cd'ed to a mounted 
LV.  The first couple of directories were created but subsequent 
attempts give the following error:

#mkdir: cannot create directory `xxxxx': Input/output error

The contents of /var/log/messages shows this:

Aug  5 10:48:57 inet05 kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Aug  5 10:48:57 inet05 kernel: hda: dma_intr: error=0x40 { 
UncorrectableError }, LBAsect=43072608, sector=43072608
Aug  5 10:48:57 inet05 kernel: ide: failed opcode was: unknown
Aug  5 10:48:57 inet05 kernel: end_request: I/O error, dev hda, 
sector 43072608
Aug  5 10:48:57 inet05 kernel: EXT3-fs error (device dm-4): 
read_block_bitmap: Cannot read block bitmap - block_group = 68, 
block_bitmap = 2228224
Aug  5 10:48:57 inet05 kernel: Aborting journal on device dm-4.
Aug  5 10:48:57 inet05 kernel: ext3_abort called.
Aug  5 10:48:57 inet05 kernel: EXT3-fs error (device dm-4): 
ext3_journal_start_sb: Detected aborted journal
Aug  5 10:48:57 inet05 kernel: Remounting filesystem read-only
Aug  5 10:48:57 inet05 kernel: EXT3-fs error (device dm-4) in 
ext3_reserve_inode_write: Journal has aborted
Aug  5 10:48:57 inet05 kernel: EXT3-fs error (device dm-4) in 
start_transaction: Journal has aborted
Aug  5 10:48:57 inet05 kernel: EXT3-fs error (device dm-4) in 
ext3_mkdir: Journal has aborted

What is going on?  How do I fix it?

Regards,
Jim

The favour of a direct response is requested as I am a diges 
subscriber.

-- 

***     e-mail is NOT a secure channel     ***
James B. Byrne                mailto:ByrneJB.<token>@Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3CE               delivery <token> = hal