I'm running into a problem with some disks on an Ubuntu system. They keep going into readonly mode. We have systems running in 5 different ski resorts and this problem has now occurred in 3 of them.
The machines process movies and run a webserver and some other basic services. All machines used to have regular SATA disks. We have now installed SSD-disks in two machines, so far these haven't gone into readonly and they have been running for weeks. Some resorts have a lot of traffic and data to process and some less. We haven't been able to establish a relation between that, the problem and the type of disk.
The video processing system is not ours and we rely on a partner to keep this running. They claim there is no problem with the OS. We are responsible for hardware and the entire system. The problem with this is that I can't login to check any logs and the partner won't give me access. What we would like to know is what causes a disk to enter readonly mode so we can takes measures to fix this.
Things we have done so far:
- Change disks on two machines to SSD => now running well
- Improve/fix wiring to ensure stable power supply
- Run memory test on machine with this problem => no problems found
- Replace broken CPU on one machine which had this problem. The problem did come back after we changed the CPU so we also replaced the disk for another regular one since we ran out of SSDs. It has now been running well for 18 hrs.
I ran into this thread claiming this could be a kernel bug. Any comments on that?
I will be running checks on one of the replaced disks today.
Happy with all feedback! - Abel