On Sat, Sep 13, 2014 at 06:46:40PM -0300, Pablo Parodi wrote:
Every saturday (I have installed this vps since 3 weeks ago) I check the status of the server I found that the file system is in read-only mode
The most common reason for this is a disk that is throwing errors. When this is the system disk, it inhibits logging the error in /var/log/messages. However, the error will be logged in other places.
3 places to check:
1) Run the 'dmesg' command, look for errors 1a) (If you had a remote syslog server configured, you won't miss errors in /var/log/messages because the system disk is read-only)
2) 'cat /dev/vcs' to see if there is anything on the console. (A server will ideally have a console log configured to not miss anything.)
3) 'smartctl -a /dev/sda' will show you if the disk has failed its self-test. (Ideally you have it configured to email you in this case.)
I suppose that the issue is a very high I/O request on the HD during the backup process.
I have never seen high I/O rates cause a read-only filesystem, except in the case where a disk error was visible. Linux has no problems with extremely busy disks; I have clusters with 100s of servers that run their disks with high I/O requests 24 hours a day for years, with no problems that were not visible in the logs 1-3.
-- greg
p.s. your English is pretty good!