disk errors?

Redhat 5.5

My server stopped responding to ssh, so I had to power cycle it.  

The following are in my /var/log/messages

Mar  1 11:05:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:05:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:05:01 ai0 kernel:
Mar  1 11:10:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:10:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:10:01 ai0 kernel:
Mar  1 11:15:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:15:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:15:01 ai0 kernel:
Mar  1 11:20:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:20:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:20:01 ai0 kernel:
Mar  1 11:25:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:25:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:25:01 ai0 kernel:
Mar  1 11:30:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:30:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:30:01 ai0 kernel:
Mar  1 11:35:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:35:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799
Mar  1 11:35:01 ai0 kernel:
Mar  1 11:40:01 ai0 kernel:       blocks= 585871964 block_size= 512
Mar  1 11:40:01 ai0 kernel:       heads= 255, sectors= 32, cylinders= 71799

What does this mean?