Questions[dmesg](server)

I just rebooted my monitoring server for the first time in a while, and the following starting filling the screen:

Jul 11 23:52:30 monit kernel: [   25.255908] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Jul 11 23:52:30 monit kernel: [   25.256170] ata1.00: BMDMA stat 0x24
Jul 11 23:52:30 monit kernel: [   25.256278] ata1.00: failed command: READ DMA
Jul 11 23:52:30 monit kernel: [   25.256410] ata1.00: cmd c8/00:c0:20:68:35/00:00:00:00:00/e0 tag 0 dma 98304 in
Jul 11 23:52:30 monit kernel: [   25.256416]          res 51/40:9f:41:68:35/00:00:00:00:00/e0 Emask 0x9 (media error)
Jul 11 23:52:30 monit kernel: [   25.256809] ata1.00: status: { DRDY ERR }
Jul 11 23:52:30 monit kernel: [   25.256933] ata1.00: error: { UNC }
Jul 11 23:52:30 monit kernel: [   25.304388] ata1.00: configured for UDMA/66
Jul 11 23:52:30 monit kernel: [   25.304430] ata1: EH complete

. . . 

Jul 11 23:52:30 monit kernel: [   25.552451] sd 0:0:0:0: [sda] Unhandled sense code
Jul 11 23:52:30 monit kernel: [   25.552462] sd 0:0:0:0: [sda]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Jul 11 23:52:30 monit kernel: [   25.552475] sd 0:0:0:0: [sda]  Sense Key : Medium Error [current] [descriptor]
Jul 11 23:52:30 monit kernel: [   25.552490] Descriptor sense data with sense descriptors (in hex):
Jul 11 23:52:30 monit kernel: [   25.552498]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
Jul 11 23:52:30 monit kernel: [   25.552529]         00 35 68 41 
Jul 11 23:52:30 monit kernel: [   25.552543] sd 0:0:0:0: [sda]  Add. Sense: Unrecovered read error - auto reallocate failed
Jul 11 23:52:30 monit kernel: [   25.552559] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 00 35 68 20 00 00 c0 00
Jul 11 23:52:30 monit kernel: [   25.552587] end_request: I/O error, dev sda, sector 3500097
Jul 11 23:52:30 monit kernel: [   25.556607] ata1: EH complete

I already know I need to replace the HDD (Cost of Data > Cost of HDD), but I want to know for my own knowledge what's actually wrong with it.

Yes, our monitoring server has no RAID, just one HDD... Don't look at me...

I would like to read my Centos 5.x dmesg with timestamp, how do I do this?

I have (for example) this log entry in dmesg output:

[600711.395348] do_trap: 6 callbacks suppressed

Is there a possibility to convert this 'dmesg' time to 'real' time to know, when this event happend?

I keep getting these messages in /var/log/messages :

Mar  8 23:17:25 saas1 kernel: martian source 169.254.1.1 from 169.254.95.118, on dev usb0
Mar  8 23:17:25 saas1 kernel: ll header: ff:ff:ff:ff:ff:ff:00:21:5e:de:1b:be:08:06

Over and over every 5 seconds there's another report exactly the same way.

I did a whois on 169.254.95.118 and get a strange message back also:

http://whois.arin.net/rest/nets;q=169.254.95.118?showDetails=true&showARIN=false

This is the "link local" block. It was set
aside for this special use in the Standards 
Track document, RFC 3927 and was further
documented in the Best Current Practice
RFC 5735, which can be found at:
http://www.rfc-editor.org/rfc/rfc3927.txt
http://www.rfc-editor.org/rfc/rfc5735.txt
It is allocated for communication between hosts 
on a single link. Hosts obtain these addresses 
by auto-configuration, such as when a DHCP 
server cannot be found.
A router MUST NOT forward a packet with an IPv4 
Link-Local source or destination address, 
irrespective of the router's default route configuration 
or routes obtained from dynamic routing protocols. 
A router which receives a packet with an IPv4 
Link-Local source or destination address MUST NOT 
forward the packet. This prevents forwarding of 
packets back onto the network segment from which 
they originated, or to any other segment.

I am trying to write some custom messages in my dmesg output. I tried:

logger "Hello"

but this does not work. It exits without error, but no "Hello" appears int the output of:

dmesg

I am using a Fedora 9, and it seems that there is no syslogd/klogd daemon running. However, all my kernel messages are succesfully written in the dmesg buffer.

Any idea?