54
7
My disk often is utilized, but top (and htop, a custom replacement) show nothing suspicious.
Is there a way to sort processes by I/O (more specific: disk) utilization?
EDIT
Found out using iotop that those strange processes are flush-8:16 and jbd2/sdb3-7. Seems to have to do with usual filesystem operations.
java.is.for.desktop
Posted 2010-03-02T16:17:38.390
Reputation: 1 458
55
Have you tried iotop ?
You may need to install it before. Also, it depends on a kernel feature that may or may not enabled in your specific distribution.
b0fh
Posted 2010-03-02T16:17:38.390
Reputation: 2 005
2Root access needed, FYI. – Paul Draper – 2015-01-24T17:27:57.790
1Works on Mac OS X, too. Not sure that it is going to help with the problem at hand, though. – dmckee --- ex-moderator kitten – 2010-03-02T16:27:20.037
3wow. That's fantastic. 15+ years of admin work and I've never run into that. Thanks! – skarface – 2010-03-02T17:06:39.193
23
You might want to give atop a try. It seems to do a good job of letting you know what is going on.
afluth
Posted 2010-03-02T16:17:38.390
Reputation: 331
1Also no root or suid needed. – Rolf – 2018-02-25T21:08:32.797
Seems to be better than iotop because it also shows IO busy percent. – sorin – 2014-03-18T13:36:30.070
0
iostat is still the king of detailed I/O information.
CivMeierFan
Posted 2010-03-02T16:17:38.390
Reputation: 109
http://unix.stackexchange.com/questions/55212/how-can-i-monitor-disk-io – Ciro Santilli 新疆改造中心法轮功六四事件 – 2016-05-18T12:37:37.463
https://serverfault.com/questions/25032/linux-disk-io-load-breakdown-by-filesystem-path-and-or-process/25034#25034 – qwr – 2019-07-05T21:44:42.943
1If I'm correct flush and jbd concerns the sync of the journal (FS metadata) to the disk. Which means you must have some processes either writing to the disk or reading a lot of data and you have the atime option on your mount. I don't recommend this because some software relies on it (mutt and I have heard one backup tool) but you can set your mount to relatime or even "better" noatime. The latter will completely stop updating the access time (which incures a disk write) each time a file is read. – Huygens – 2012-07-27T21:48:50.957