Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)
- by snitko
I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx.
Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too.
Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output:
$ iostat
avg-cpu: %user %nice %system %iowait %steal %idle
0.17 0.00 0.02 0.57 0.16 99.07
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
xvda 2.25 39.50 16.08 147042 59856
xvdb 0.00 0.05 0.00 192 0
xvdc 2.20 25.93 24.93 96530 92808
xvdd 0.01 0.12 0.00 434 16
xvde 0.04 0.23 0.35 858 1304
xvdf 0.37 0.31 4.12 1162 15352
Rebooting didn't help either.
Any ideas where should I be looking?
