100% Disk Utilization

Hi All,
Most of the time of of our application server is showing 100% disk utilization and due to this system performance is badly affected. Actually Apps server is having only one disk c drive and OS as well as SAP Application sits on the same disk. other apps servers are also having the same configuration of one disk.For all apps server we are using Windows NT and CI is on HPUX platform. How to resolve this issue?
Pls help
Regards,
Prashant

Hi Prashant,
The High Disk Utilisation indicate quite a few things lets discuss one by one.
1. Here i could suspect the DB time may be high and i think there would be presence of expensive sql statements, so just check in st04.
2. If you have Oracle Database then there is a chance of I/O bottleneck.
In the oracle session the I/O section is broken into subsections as
follow:
High Average Response Time per Read Request
High Average Response Time per Commit
High Average Response Time per Buffer Busy Wait
High Number of Waits for Free Buffers
High Number of Waits for Buffers being written to Disk
High Number of Space Waits for the Log Buffer
File System Response Times
So check the above mentioned part providers.
3. In the operating system monitor of the database server also we can find
the high numbers of I/O wait. This value indicates problems in I/O. So check on this.
4. And at last do monitor SM66 and if possible trace through st05 then we can
narrow down the problem why its going for Disk utilisation regularly. Try to find out the Report Name as well.
Finally analys the subsystem using external tools and still the problem is not getting solved the get in conatct with thehardware vendor of th I/O sub system.
Thank you,
Tilak

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Root cause for 100 % disk utilization

Hi All,
Whenever in one of the dailog instance disk utilization is showing 100% sap system is getting very slow,what is the root cause for 100% utilization .At that moment of time when I checked the CPU usage it showed 98% CPU idle. server is on Windows NT and around 13GB of RAM is always free.
We have only one drive in the apps server.Can this be the cause of 100% disk utilization?
Waiting for ur frequent responses.
Regards,
Prashant

Hi,
I have answered similar questions :
[Re: Disk Utilization 100%]
as described above, one thing that cause 100% disk utilization is that writer processes (and read process too) is concentrated only on a single disk (equivalent to single volume group or single logical volume).
we can imagine that a large number of user hitting the single disk (where datafiles exist) on the same time with a huge transaction load.
if we can manage writable datafiles in several locations (equivalent to several volume groups or several logical volumes) where several datafiles exist, writer processes (and read process too) will be distributed to that several locations, so that each location (each disk, each VG or each LV) utilization may not reach 100%.
so it is important to design writable datafiles in multiple location in different disks to prevent 100% disk utilization.
one thing should be remember is to consult with hardware and storage vendor if there is any possibilities bottleneck or I/O issue on your hardware or storage.
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http://www.microsoft.com/en-us/download/details.aspx?id=30652
Help with installation (if needed) is here
When you have, open an elevated command prompt and type the following
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If your problem is not CPU or HD then check off the relevant box/s as well (for example networking or registry) Please configure yours as per the below snip
Click Start
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Zip the file and upload to us on Onedrive (or any file sharing service) and give us a link to it in your next post.
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Windows 8.1 running extremely slow with high disk utilization

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Try these steps.
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Click on top of column showing the memory. This will arrange them in ascending or descending order of how much memory is consumed.
Find the ones which is consuming maximum memory
Uninstall if you don’t need the program or app. Re-configure or re-install the software or app if it is an important one.
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Grid Control showing excessive amount of disk utilization.

Hi Folks,
I understand that Oracle doesn't support their products 100% on non Oracle VMs, but I thought I might take a stab at it.
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Metric               Disk Device Busy (%)
Disk Device               0 C:
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Alert Triggered          Jun 3, 2009 7:57:54 PM
Last Updated          Jun 4, 2009 3:48:48 PM
Acknowledged          No
Acknowledged By     n/a
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If this question is answered, please mark appropriate posts as correct/helpful and the thread as closed. Thanks

HP DV6 Hard disk Utilization 100%

I am using HP Pavilion DV6 6168tx with 4GB RAM and 2GB AMD Radeon. OS is Windows 8.1 (64Bit). The Problem is Frequent Hangs and Freezes due to 100% Utilization of Disk. I have Reinstalled the OS and updated it but problem remains the same. Following is the screenshot of Task Manager.
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@Zue ,
Hello and thank you for posting on the HP support forums. Here are a couple of links that may assist you with your issue.
The first one was found here on the HP support forums. Originally posted by @finder070 .
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a.     Press windows + R key from the keyboard.
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Keep us updated on the status of the issue.
**Clicking on the Kudos! white star is a nice way to say thank you on any post that helped you or resolved the problem.**
**Selecting "Accept as Solution" for a reply that solves your issue helps others who are searching the web for an answer**
Here is the link to that post it has other answers as well.
100% Disk Usage
Here is another link to a possible resolution for you.
Windows 8.1 100% disk usage
I hope this helps.
Thank you again for posting and have a great day.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
D5GR
I work on behalf of HP

ST06 Disk Utilization 100%

Dear All,
My SAP PRD is 4.7 EE on Win2003 with Win sp2 on MS SQL 2000 Data Base with 4 GB of RAM.
The performance on the system is very slow and we have planned to go for an upgrade on Physical Memory. The DB resides on the SAN BOX and in connected wih Fiber channel from PRD to SAN (1 GBPS).
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I see that the CPU Idle time is always above 95%. check TOP CPU time and found that everything seems to be normal.
What all things do i need to consider to nail down the issue.
Advise me in resolving the issue.
regards
Sumanth

No cross posting
Read the "Rules of Engagement"
Regards
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Disk Utilization 100%

Dear friends
We have problems of performance with the system SAP (HP-UX with Oracle 10.2)
The Disk Util is 100% and the GLANCE command shows that the oracleSID process is using a high disk.
The problem is when any process to access to

Hi
we have similar problem few weeks ago. we are using HPUX 11.23 and Oracle 9.2.0.6.
many reason can cause this problem :
- write process (mainly) -- and read process too,that is not separated to some logical volume (or volume groups) but concentrated in one logical volume (or one volume groups). in this case write process will hit only in one LV ( or VG). to solve this, you must distribute write process into several LVs (or several VGs) so writer process will write evenly to the datafile in several locations. the same way when reading process from several LVs (or VGs) compared with reading in one LV (or one VG).
- bottleneck in your I/O. you must discuss with your hardware vendor and storage vendor, if there is some bottleneck that causing this.
what have happened to us is broken index of the most table we have caused by system restore few weeks before. after we are doing index for suspected tables, our utilization in decreased.
we are using command :
sar -d 5 5
to monitor disk utilization
and maybe nfile parameter (sum of files opened by OS at the same time) is useful to be monitored, using command :
sar -v 5 5
to monitor nfile parameter.
hope it help you
rgds,
Alfonsus Guritno

Can a disk utilization be more than 100% as shown from alert notification?

Hello,
I received an alert notification from the GRID. The percentage is 670.94%? What does this mean? Is it possible to go over 100%?
Thank you.
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Disk Utilization reach 100%

Hi Experts,
I'm using oracle 805, the SAS external storage use only for database. The external storage capacity is 2Tb and 60% is free. I check disk utilization using ST06 show 90-99, Kb transfered/s : 47,527. Then I check the processes in SM50, there is no heavy process, a lot of free work process. I check the avg. response time in ST03 seems normal, around 600-700 ms.
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thank you
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Hello,
This monitor shows entire operating system performance data and you are only talking about SAP processes .
Have you check in op system task manager for any server process which could cause bad performance?
Regards.

Disk Utilization false alarms from EM dbconsole

Hi,
I have a 10.2.0.1 instance on Windows XP. EM frequently reports disk problems that don't exist. Example below. The disk is no where near 100% so I don't know where EM is getting this. Has anyone else had this problem? Is this a bug?
ex.
Name=op1t1tsr
Type=Host
Host=op1t1tsr
Metric=Disk Utilization (%)
Disk Device=1 E:
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Disk Utilization for 0 C: D: E: is 99.61%, crossed warning (80) or critical

Hi,
I have windows 2008 R2 64 bit OS and database version is 11.1.0.7.0 64 bit ...
I got the below error via EM.
Target Name=ORSDEV.xxxdomain.com
Target Type=Host
Host=ORSDEV.xxxdomain.com
Metric=Disk Device Busy (%)
Metric Value=99.61
Disk Device=0 C: D: E:
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Message=Disk Utilization for 0 C: D: E: is 99.61%, crossed warning (80) or critical (95) threshold.
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Notification Rule Owner=SYSMAN
Notification Count=1
1.Can any one tell how to trace this warning and where to check for this alert ?
2.what is the meaning of Disk Utilization for 0 ?
3.How to identify the problem and resolve the issue in this case ?
Thanks & Regards,
Vikash (Junior DBA)

Hi Vikash,
This "Disk Utilization" metric actually points to hos busy is the disk device (in percentage) and not a percentage of disk capacity. As a matter of fact, in the 11.1. Database Control, it has been renamed to "Disk Device Busy(%)".
Regarding of the meaning of a disk busy, it is the percentage of time the physical disk is active. And it may no be a problem, as you can see at http://sunsite.uakom.sk/sunworldonline/swol-08-1999/swol-08-perf.html : "Complex systems can be 100 percent busy, but still have a lot of spare capacity".
On the other hand, to check how "full" a Disk is, the metric 'Filesystem Space Available (%)' can be used. This metric represents the percentage of free space available in the file system. Also, the Filesystem Size (MB) checks the total space (in megabytes) allocated in the file system.
Hope this helps.
Thanks,
Cris

Disk utilization threshold in iseries

Hello Gurus,
I have a SAP R/3 4.6C system over iseries V5R4M0. our disk utilization is near to 80% Im afraid that this increase utilization affect my system perfomance.
Exists one threshold for disk utilization?
My disk arm is near to 20% an now we dont have any performance problems.
Regards,
Ernesto Castro.

Hello Ernesto,
in very small systems you had this in the past. Nowadays, this is typically no issue any more. You can run diks up to 90 or even 95% - you just should keep in mind, that this becomes risky as it might happen, that you reach 100% because of temp-storage and then the system suts down ...
=> You can run with that without issues, but should have a look for increasing the disk when it grows further ...
Regards
Volker Gueldenpfennig, consolut international ag
http://www.consolut.net - http://www.4soi.de - http://www.easymarketplace.de

ST06 Disk Utilization

Dear All,
My SAP PRD is 4.7 EE on Win2003 with Win sp2 on MS SQL 2000 Data Base with 4 GB of RAM.
The performance on the system is very slow and we have planned to go for an upgrade on Physical Memory. The DB resides on the SAN BOX and in connected wih Fiber channel from PRD to SAN (1 GBPS).
We see that the DISK Utilization in ST06 is always 100%. As a rule it should not be more than 50%.
What all things do i need to consider to nail down the issue.
Advise me in resolving the issue.
regards
Sumanth

> We see that the DISK Utilization in ST06 is always 100%. As a rule it should not be more than 50%.
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