Hi Sabuj, It's an Ubuntu Server LTS 64 bit. The server itself is some kind of Dell. I think something can be wrong with it maybe? I installed smartmontools but it says it does not support SMART for the disk array???. One thing which can cause such high load is disk or controller failure problems. It has a PERC 6/I controller, I'm trying to figure out how to check health status on that.
Csaba ________________________________________ From: [email protected] [[email protected]] On Behalf Of Sabuj Pattanayek [[email protected]] Sent: Wednesday, February 22, 2012 1:31 PM To: [email protected] Subject: Re: [nlug] Re: Limiting I/O load for a process You might try using cgroups (http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Resource_Management_Guide/ch01.html), it says it has a method of limiting disk i/o, but I've never tried it. You didn't mention which distro you were using, but most modern distros should have this. On Mon, Feb 20, 2012 at 1:16 PM, tocsa <[email protected]> wrote: > Thanks for pointing that out Sabuj! I knew Linux is awesome, there has > to be a way. I have to see if this is part of the stock kernel or a > custom kernel is needed. > > Csaba > > On Feb 20, 12:18 pm, Sabuj Pattanayek <[email protected]> wrote: >> Try using the deadline scheduler >> >> >> >> >> >> >> >> On Mon, Feb 20, 2012 at 12:14 PM, Tilghman Lesher <[email protected]> >> wrote: >> > On Mon, Feb 20, 2012 at 11:59 AM, tocsa <[email protected]> wrote: >> >> The server in our laboratory has some problems. A PhD student is >> >> running computation which has very heavy I/O load, but no CPU load. >> >> The lack of CPU load means that there's nothing which would hold back >> >> the process to hog the hard drive. Many of you are server >> >> administrators so you know the concept of "server load". If it is >> >> above 3, then the server is under very heavy load, above 6-7 it can >> >> happen that you cannot log-in remotely. >> >> So far my techniques is that I keep an open root console on my desktop >> >> machine at the university, that console is always alive. Last week I >> >> saw load above 22. Today I had to take a screenshot, so when I'll be a >> >> grandpa I can show it to my grandchildren: load above 76. >> >> >> The machine is a server hardware, quad core with 16GB RAM, I don't >> >> exactly know the HDD subsystem, browsing the /proc I think it's some >> >> kind of SAS disks. It is running Ubuntu Server LTS. >> >> >> Question: how can I limit the I/O access of a process? >> >> >> I've seen numerous articles on disk quotas, network bandwidth tuning, >> >> some on CPU load tuning, but no I/O load tuning. >> >> > There's nothing I can see that would do that. However, since what >> > you're really aiming to do is to avoid resource starvation, why not >> > re-nice his process? Give it a slightly lower priority, and >> > everything else will preempt his process when those other processes >> > need CPU and I/O time. Ask him nicely, and he may even start his next >> > process with a nice'd priority. >> >> > -- >> > You received this message because you are subscribed to the Google Groups >> > "NLUG" group. >> > To post to this group, send email to [email protected] >> > To unsubscribe from this group, send email to >> > [email protected] >> > For more options, visit this group >> > athttp://groups.google.com/group/nlug-talk?hl=en > > -- > You received this message because you are subscribed to the Google Groups > "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/nlug-talk?hl=en > -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en
