Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

excessive IOWAIT

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers excessive IOWAIT
# 1  
Old 06-18-2005
excessive IOWAIT
i have a server constantly have high iowait, but i am not able to tell which process generate the most of io. none commands, such as iostat, sar, top will give me this kind of information.

hope there is some command can help me to spot the process generate the most of io


let to know input from all guru here. thanks
# 2  
Old 06-19-2005
Can you provide more details about the system? What is the OS and what are the disk systems involved?

I would start with sar -d, this will let you know which disk is having a problem(if it is a disk, which is usually the case with heavy IOWAIT).

Based on what is stored on that disk you can probably start tracking down any applications what would access it.
 
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. HP-UX

FDX303??? SSL Excessive Message Size???

I'm hoping someone has seen this before because I'm trying to use an old custom program to automate uploading bank files. The odd thing is the program works with JP Chase old sFTP site but not on this new one? I appreciate any and all assistance I have about a month to figure this out... ... (3 Replies)
Discussion started by: prophyt
3 Replies

2. AIX

Excessive Kernel CPU Usage

Good Morning All, I've been a long time lurker but this if my first time posting. About 6 months ago I started a new job with an AIX box. I had administered many Debian and Red Hat variant systems before, but this was my first AIX. It is an old box (Power4) that runs our ERP. It had been... (2 Replies)
Discussion started by: Jacoby0419
2 Replies

3. Shell Programming and Scripting

Script to monitor IOwait

Hello, I need to monitor IOwait on a server and have started this script directly on the ssh prompt. Effectively it almost does what it is supposed to do, but I have no idea how to stop it? How can I make it run it as a file based bash script? ( iostat -xk 1 /dev/sdb2 | \ perl... (10 Replies)
Discussion started by: cuantica
10 Replies

4. UNIX for Dummies Questions & Answers

Is total CPU usage for sar %user+%system+%iowait?

Hi all Can anyone advise/confirm whether total CPU usage when running sar is %user+%system+%iowait or is it %user+%system only? I want to confirm whether I am having a CPU-bound problem or not. This is a single-CPU VMware machine. $ sar 5 20 Linux 2.6.18-238.5.1.el5... (7 Replies)
Discussion started by: newbie_01
7 Replies

5. AIX

Excessive interrupt disablement time

Has anyone seen this error before? On the IBM website they suggest updating to AIX 6.1.0.0 TL2, but we are already at that level. Any help or suggestions are appreciated! Thanks! />errpt -a --------------------------------------------------------------------------- LABEL: ... (2 Replies)
Discussion started by: troym72
2 Replies

6. Linux

how to trace iowait to a certain process

Hi all, Under top command you could see some iowait output. Is any way to locate which process(s) is causing the high percentage of iowait? 17:48:39 up 19 days, 18:54, 3 users, load average: 3.24, 3.14, 3.17 392 processes: 389 sleeping, 1 running, 2 zombie, 0 stopped CPU states: cpu user... (3 Replies)
Discussion started by: will_mike
3 Replies

7. UNIX for Advanced & Expert Users

How to reduce IOWAIT in linux

Hi All, Any ideas how to reduce IOWAIT and increase disk speed on Linux server. Server has 4 CPUs and with 8GB RAM. Thanks in advance, Regards, Bache (3 Replies)
Discussion started by: bache_gowda
3 Replies

8. AIX

Excessive Page INs

Gurus, What does excessive Page Ins indicate for the memory status on the machine. Or, in another form, Reardless the OS, does excessive Page INs reflects memory shortage ? (6 Replies)
Discussion started by: Negm
6 Replies

9. UNIX for Advanced & Expert Users

Excessive Paging&Swapping!

Hi all! Working on Oracle v8i/9i on Unix Sun Solaris v8.0. I am experiencing excessive paging & Swapping.Would like to know the cause. I guess:could be due to inappropriate setting of Unix Kernel Parameters... Please correct me if I am wrong! Thanks&Regards, Amit. (5 Replies)
Discussion started by: Amitstora
5 Replies
Login or Register to Ask a Question