disk errors help!!

Glenn Dawson glenn at antimatter.net
Thu Oct 6 22:55:34 PDT 2005


At 06:55 PM 10/6/2005, RYAN vAN GINNEKEN wrote:
>My freebsd 4.11 system has been subjected to a power failure and 
>seems to have many disk errors something about soft updates and not 
>being able to read certain sectors it comes up with the standard 
>single user pick your shell command and tells me to run fsck 
>manually.  I have run it several times but the system keeps comming 
>with ad0s4 marked dirty which is my /usr partition.  Sometimes i get 
>a resetting device ata0 timeout error.  What should i do of course i 
>have no current backups for this system and the most important thing 
>is retrieving my users data it would be great if i could get the 
>system to boot up but if i have to reinstall no biggy as long as i 
>can get most of my data back.
>
>ps  i promise to do remote backups nightly for the rest of my life.

Sounds like you definitely have some problems.

If you have somewhere to put it, you can use dd with 
conv=noerror,sync to get an image of the drive, less the damaged 
areas (which get filled in with nul's by the sync option).  Once you 
have the image, you can use it as a backing store for md(4), fsck 
that, mount it and get whatever you can from what's left.

-Glenn



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