I am encountering following error in /var/log/messages:
Aug 15 03:55:42 hostname smartd: Device: /dev/sda, 1 Currently unreadable (pending) sectors
Which cause the / partition to be mounted as read-only. The server is accessible anyway but you cant do anything much inside. Lets troubleshoot this.
I see read-only filesystem mounted when creating a test file in /root directory:
$ touch /root/testfile touch: cannot touch `/root/testfile': Read-only file system
What is SMART daemon (smartd)?
Self-Monitoring, Analysis and Reporting Technology (SMART) system built into many ATA-3 and later ATA, IDE and SCSI-3 hard drives. The purpose of SMART is to monitor the reliability of the hard drive and predict drive failures, and to carry out different types of drive self-tests. We will use smartctl command to help us find out what is wrong with the disk.