Re: remounted read-only
Eric Persson wrote:
Dave Sherohman wrote:
If that's the cause (and I agree that it almost certainly is), then
in means your drive is encountering errors.
What kind of errors, any errors?
Mostly bad spots in the magnetization layer. All harddrives have these
because it is technically impossible to make a 100% perfect drive. This
is compensated by having a "hidden" reserve on the drive which is
automatically used whenever a bad sector is encountered. As long as this
hidden reserve is sufficient, everything is fine and the user will not
even notice that this is happening. When the drive actually has
noticeable errors on the file system it is already in a stage where it
becomes really dangerous for your data. Time to throw out the drive. If
you have the serial number you can check at the manufacturer's website
if your drive belongs to a known bad batch. That might also make a
difference for warranty replacement.
Is it possible to set it to a higher loglevel, so it hints a bit of why
it remounted readonly?
It might be more informative to access the drive's self-diagnosis system
directly. You can do this with the tools provided in the package
"smartmontools". This also includes a daemon which can check the
drive(s) in regular intervals and send you an email when trouble is
brewing. This will in most cases give you a warning long before you
reach the critical state that you seem to be in now. Really, before you
do anything else, boot from a rescue CD, mount the HD read-only and
clone it to another drive. The next write access could be the one which
kills the drive and takes all your data with it.
Regards,
Florian
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