Login or Register to Ask a Question and Join Our Community


AIX

Topas total Disk Busy %

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems AIX Topas total Disk Busy %
# 1  
Old 06-17-2013
Topas total Disk Busy %
Hi Everyone,
anyone know how to derive the value for the total disk busy % (shown in topas ) ?

Thanks.


Best Regards,
ckwan
# 2  
Old 06-18-2013
It is the same measurement as in "iostat". There is a sensor inside the OS for every hdisk device. This sensor either shows "busy", when the command queue of the disk is non-empty, or "idle", if it is. This sensor is queried several times per second (i have forgotten the exact rate). Then, a percentage is calculated by matching the number of "idle" answers to the number of "busy" answers.

It is in the nature of this measurement that many very small disk requests can saturate the comman buffer and make a disk "100% busy" when it effectively doesn't do that much. This does not necessarily mean the disk is at its limit, just that the command queue has never been empty. Correlate this with the I/O amount ("kb_read" and "kb_written") to get a picture about how much stress the disk is effectively exposed to.

I hope this helps.

bakunin
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. AIX

Need to know %age disk busy on AIX

Hi , Following alerts are coming for %busy device on a server Disk Device hdisk5 is 100% busy Please assist how do I analyse this and also how do I check the %age busy for hdisk5. Best regards, Vishal (4 Replies)
Discussion started by: Vishal_dba
4 Replies

2. AIX

Command to check the busy % for a hard disk device like hdisk5

Please help with command to check the busy % for a hard disk device like hdisk5 Best regards, Vishal (7 Replies)
Discussion started by: Vishal_dba
7 Replies

3. Solaris

How to count total HDD size of disk?

Hi, I am trying to fetch total HDD size through command line on solaris machine: bash-3.2# iostat -E sd0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: VMware Product: Virtual disk Revision: 1.0 Serial No: Size: 42.95GB <42949672448 bytes> Media Error: 0 Device... (1 Reply)
Discussion started by: omkar.jadhav
1 Replies

4. UNIX for Dummies Questions & Answers

Display total hard disk size?

Hi, Using Redhat, how do I display total hard disk size? I know how to do that in Solaris, you can type, format. It will show how big the disks are. This is what I did so for. $ df -t ext3 -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 ... (1 Reply)
Discussion started by: samnyc
1 Replies

5. Linux

How to Calculate Disk Queue length and Disk Busy Time

Hi, Am doing an enhancements related to monitoring a Linux disk I/O statistics. The /proc/diskstats file is used to get the each disk I/O statistics. But, It returns the raw value. How to calculate the Disk Queue Length and Disk Busy time from the raw values. Guide me. (1 Reply)
Discussion started by: maruthu
1 Replies

6. UNIX for Advanced & Expert Users

How to check total disk usage ?

Hi.. What is the command to check total disk usage for specific directory in MG/GB/Byte ? As example i want to check disk usage for directory pproc ? Please help me.. Thank you, Baharin (3 Replies)
Discussion started by: bh_hensem
3 Replies

7. Solaris

command to get the total disk space (available + free)

is there a command to get the total disk space (available + free) on the solaris server ? thanks (3 Replies)
Discussion started by: sudhiroracle
3 Replies

8. UNIX for Advanced & Expert Users

Filesystem mystery: disks are not busy on one machine, very busy on a similar box

Hi, We have a filesystem mystery on our hands. Given: 2 machines, A and Aa. Machine Aa is the problem machine. Machine A is running Ubuntu, kernel 2.6.22.9 #1 SMP Wed Feb 20 08:46:16 CST 2008 x86_64 GNU/Linux. Machine Aa is running RHEL5.3, kernel 2.6.18-128.el5 #1 SMP Wed Dec 17 11:41:38... (2 Replies)
Discussion started by: mschwage
2 Replies

9. AIX

Hard disk usage is 100 Percent Busy for any command

hi, AIX 5.3 For any command(say tar command) I am getting 100% busy for my hdisk. But my CPU and Memory is not busy and have more idle also. Please advice for any performance analysing. Thanks in Advance, (3 Replies)
Discussion started by: npcrao
3 Replies

10. UNIX for Dummies Questions & Answers

Install a new disk - i'm a total novice

Hi, This is the last of my two questions. Unfortunately i'm a total unix/solaris novice and our current solaris project has landed on my lap!! Sorry to bother you all!!! I currently have a solaris 7 system with two IDE disks in it. I need to add a third disk and install another version of... (3 Replies)
Discussion started by: AJD
3 Replies
Login or Register to Ask a Question