ext4, the disk performance deteriorates rapidly after a reboot
by whatsthecraic from LinuxQuestions.org on (#4R3SA)
Good folks,
I recently requested to my host provider (ovh.ie) to increase the disk space in my personal VPS. After the update, I've aded the extra free space in the existing partition with parted & resize2fs, which seems to be correctly recognised by lsblk & co. The problem is that, now, after a reboot, the VPS becomes quite unresponsible after 4-6 hours of uptime. The CPU usage peaks at 100%, completely consumed by processes such as kworker/u2:0+flush-254:0 and jbd2/vda1-8. Monitoring the VPS with journalctl, iostat and fatrace revealed only mild activity from sshd and exim, still on the normal range. But it's like the partition becomes incredibly slow or unresponsive, with the processes constantly stuck while trying to write in the disk. Here is the output of dmesg: http://ix.io/1WK9. I am not sure how to track down the problem. Running fsck (e2fsck) in rescue mode showed no issues on the partition.
Any suggestion on how to track down the root cause for this behaviour?
I recently requested to my host provider (ovh.ie) to increase the disk space in my personal VPS. After the update, I've aded the extra free space in the existing partition with parted & resize2fs, which seems to be correctly recognised by lsblk & co. The problem is that, now, after a reboot, the VPS becomes quite unresponsible after 4-6 hours of uptime. The CPU usage peaks at 100%, completely consumed by processes such as kworker/u2:0+flush-254:0 and jbd2/vda1-8. Monitoring the VPS with journalctl, iostat and fatrace revealed only mild activity from sshd and exim, still on the normal range. But it's like the partition becomes incredibly slow or unresponsive, with the processes constantly stuck while trying to write in the disk. Here is the output of dmesg: http://ix.io/1WK9. I am not sure how to track down the problem. Running fsck (e2fsck) in rescue mode showed no issues on the partition.
Any suggestion on how to track down the root cause for this behaviour?