mount: cannot remount block device /dev/sda5 read-write, is write-protected

Solution 1:

I'm afraid this is due to corruption on the filesystem or problems on the underlying hardware, since it's the root filesystem my recommendation is to boot the server again with a rescue disc (or in single user mode) and try to repair the disk through fsck.

• Check what dmesg says to confirm the corruption
• Run fsck to repair the hard drive, as soon as fsck is run reboot immediately to avoid any issues

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Hola Marc,

Em temo que aixo es un sintoma de corrupcio al sistema de fitxers o de problemes del hardware subjacent, com es el / lo que et recomano es de rebotar el servidor amb un CD de rescat e intentar reparar el disc amb fsck.

• Mira que diu la comanda dmesg nomes per corroborar que hi ha corrupcio
• Executa fsck per reparar el teu disc, en quan acabi rebota inmediatament per preveure qualsevol altre tipus de problema

Bona sort!

Solution 2:

I've seen this before when a RAID card went bad, and the ext3 journal file couldn't be written to. At that point, the kernel marked the root FS read-only and wouldn't allow it to go back.

Nothing was logged about this, because of course the /var FS was on the same disc, and also RO. dmesg, however, was pleased to tell us about the problem. So, can you do a dmesg and tell us about the output?

In our case, the only fix was to power-cycle to wake up the RAID card, then reboot from rescue media and fsck the file system.