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For some reason, we are unable to write to my root ext4 partition. Unfortunately I don't have physical access to the computer, and I can't reboot or do anything because it's read only? How can we fix this? We're running ubuntu 10.04. The hard drive is an OCZ vertex

Here is a snippet of the error

[100337.752030] end_request: I/O error, dev sda, sector 9579680
[100337.752097] sd 1:0:1:0: [sda] Unhandled error code
[100337.752100] sd 1:0:1:0: [sda] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[100337.752104] sd 1:0:1:0: [sda] CDB: Read(10): 28 00 00 92 2c a0 00 00 08 00

Full error: http://pastebin.com/raw.php?i=ttLM5ZkL

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5  
Your disk is toast. Replace it. – Paul Tomblin Aug 29 '10 at 22:58

Paul says it all: your disk is toast (or maybe only your motherboard, or disk connector, or ...). Your filesystem is read-only because it automatically got remounted read-only due to the errors. You could try to cleanly shutdown by first remouting read-write with mount -o remount,rw / and then shutting down immediately. In any case, you'll most likely need to get your disk replaced.

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Additionally, I'd make sure to do a full byte-for-byte copy of the drive to another known-good disk (doesn't have to be an SSD). – EEAA Aug 29 '10 at 23:12
    
Or, failing a full disk image, backup the files while you can still read it. – Joris Aug 30 '10 at 4:45

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