?
Solved

Vmware hard disks activity

Posted on 2014-10-26
11
Medium Priority
?
277 Views
Last Modified: 2014-11-06
Hi there

A server in the company has a disk issue and here are a couple of events that are from 2 months ago and a number of NTFS events leading to the current date.
 
I have performed a read only CHKDSK disk and this has taken over 70 minute to complete on the c: drive when its less than half the size of the D: drive which only took 2 minutes.

You can also see from the AVG Disk Bytes/Write column in perfmon the bytes per second is really low and have seen triple this speed on a LUN even when installing an OS, there are also periods where the average drops to 000 bytes written so the hardware certainly needs investigating as badly performing hard drive or RAID array seems to be the culprit.

Now the server is a Virtual machine.

Any help please

Note: I know very little about virtual machines (not my area) but this incident was thrown my way therefore the simpler your answer is the more appreciated.

Thanks
Event2.png
Event-1.png
AVG-Read--Write.png
0
Comment
Question by:M SOS
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 7
  • 4
11 Comments
 
LVL 122
ID: 40405151
Error in July is too long ago to consider, however delay write fail is interesting, in Sept?

Do you have any logs for this event? e.g. it could have been a network down, path failure etc

How large are the disks you are using chkdsk on, this could be normal disk activity for your datastores.

What is the SAN, do you use Jumbo Frames, what is the networking?

Do you have a dedicated storage LAN?

What type of datastores are you using, RAID type, Disk type, SAS, SATA, SSD, disk speed, 7k, 10k, 15k?

Do you know how to use ESXTOP, you can check the latency, to see if the datastore is too slow for your VM ?

see my EE Article

HOW TO:  Performance Monitor vSphere 4.x or 5.0
0
 

Author Comment

by:M SOS
ID: 40405159
So if I get you all these answers will you be able to help?

Thanks
0
 

Author Comment

by:M SOS
ID: 40405163
I have never ever heard of Esxtop ever in my whole life.
0
Limited time offer using promo code EXPERTS25

Designed with a wealth of functionality and convenience, ATEN's new Thunderbolt™ 2 Sharing Switch takes your Thunderbolt setup to the next level. Now through August 31, 2017, Experts Exchange members get 25% off the US7220 on the ATEN USA eShop using promo code EXPERTS25.

 

Author Comment

by:M SOS
ID: 40405174
and the event viewer events and the performance monitor do not help?
0
 
LVL 122
ID: 40405177
I can certainly try and help you, that's what I try to do as an Expert!

Windows VM, does not know it's virtual! So they do not really help, we need to look at the Host!

Have a read of my EE Article, and I can show you how to use esxtop.
0
 

Author Comment

by:M SOS
ID: 40405179
So are you saying that windows monitoring tools on a VM are not actually descriptive of anything ?

The thing is I won't know all these answers until mid morning UK time...Will post them then and will be very grateful of you could have a look.

now the above questions are the one needed?
0
 

Author Comment

by:M SOS
ID: 40405193
Are you saying that Windows monitoring tools when it is a VM machine are not descriptive of anything?

The thing is I won;t be able to get the answers to your questions until tomorrow mid morning UK time? Will have a look?

Are the above question needed? Any thing else?
0
 
LVL 122
ID: 40405212
Correct, the Windows OS does not know it's a VM, so an event triggered in the log, about disk, as the disk is virtual and hosted on a hypervisor, you need to look at the whole picture to discover the issue.

If it was a physical disk, troubleshooting would be different.

Take as long as you like, gathering information. Any further Windows event logs could be handy, if they are disk related!

Those questions are good to start, I'm on GMT (UK Time!), I'm based in the UK!
0
 

Author Comment

by:M SOS
ID: 40405216
Great, Thank you very much but just one last question for tonight... Why are these Windows logs then happening

why the scan disk is taking longer and why the up-normal activity on the performance monitor?

Thanks
0
 

Author Comment

by:M SOS
ID: 40405237
What is the SAN, do you use Jumbo Frames, what is the networking?

can you clarify this question a bit clearer please?
0
 
LVL 122

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1500 total points
ID: 40405253
No idea why these are happening in the Windows logs, how often are they occuring every second, every minute?

Datastore too slow?

Scan disk taking longer because datastore is slower, because you've added more VMs to datastore or host.

What Storage Area Network, Shared Storage, Network Attached Storage are you using if ANY, you mentioned LUN ?

Jumbo Frames, are large frames configured on storage area networks, do you use them?

How is your networking configured if you use a SAN ?

Is your store for your ESXi hosts, local or shared ? (SAN).
0

Featured Post

10 Questions to Ask when Buying Backup Software

Choosing the right backup solution for your organization can be a daunting task. To make the selection process easier, ask solution providers these 10 key questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I will show you HOW TO: Install VMware Tools for Windows on a VMware Windows virtual machine on a VMware vSphere Hypervisor 6.5 (ESXi 6.5) Host Server, using the VMware Host Client. The virtual machine has Windows Server 2016 instal…
I was prompted to write this article after the recent World-Wide Ransomware outbreak. For years now, System Administrators around the world have used the excuse of "Waiting a Bit" before applying Security Patch Updates. This type of reasoning to me …
This video shows you how easy it is to boot from ISO images for virtual machines with the ISO images stored on a local datastore on the ESXi host.
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question