Solved

VM dropping packets when powering on other VM's

Posted on 2013-11-16
3
256 Views
Last Modified: 2014-03-29
Hello,

I have 2 vmware hosts, both connect to an iSCSI SAN, and all VM's are on same lun.


on Host A
I have SBS 2011 running
and Server 2008 R2 running

Both VM's share the same physical nic and Vswitch for general network access

On Host B
I've got various vm's running of various OS's
All VM's share same physical nic and vswitch for general network access


Again, all vm's , for both hosts, are stored on same ISCSI SAN


If I power on ANY VM on host B, the SBS 2011 server on Host A instantly starts lagging. Well before any guest OS loads.

Pings to the SBS Server are extremely high in terms of latency, and some will drop as well.

However, pings to the Server 2008 guest on Host A are fine, and never drop or become latent....

Drivers from both vNIC's on both guest vm's of host A are identical

i'm wracking my brain over this one....whoever can figure this one out deserves 1,000,000,000 points
0
Comment
Question by:Tom-J-Lael
3 Comments
 
LVL 119

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 39654236
It seems like your datastore is struggling with performance issues.

Is all the equipment on the Hardware Compatibility List?

Are all firmwares up to date?

Do you have a storage network just for iSCSI?

Do you have Jumbo Frames enabled?

Have you created your iSCSI network as per Best Practice?

What is the SAN spec?

Is this a new installation, and you've always had this issue, or has this just started to occur with more loading

see my EE Article, Step by Step Tutorial Instructions with Screenshots

HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0
0
 
LVL 40

Expert Comment

by:coolsport00
ID: 39656354
Agree with @hanccocka here. If you go into the Shell of the Host this VM is on, type "esxtop" (without the quotes), then "v" to get to the right resource view. What does the DAVG metric show during this process? If above 10-12, you have disk latency. If this is the case, what is your Datastore configured with (RAID, disk type, etc.)?

Regards,
~coolsport00
0
 
LVL 3

Author Closing Comment

by:Tom-J-Lael
ID: 39964049
I have the right mind to believe that the issue was due to the switches dedicated for the iscsi.

We used Dell's try and buy program to put some PowerConnect switches in place and overall performance improved, however, the performance increase was not to the extent that the client wanted to pay the price for the switches.
0

Featured Post

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

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

HOW TO: Upload an ISO image to a VMware datastore for use with VMware vSphere Hypervisor 6.5 (ESXi 6.5) using the vSphere Host Client, and checking its MD5 checksum signature is correct.  It's a good idea to compare checksums, because many installat…
In this step by step tutorial with screenshots, we will show you HOW TO: Enable SSH Remote Access on a VMware vSphere Hypervisor 6.5 (ESXi 6.5). This is important if you need to enable SSH remote access for additional troubleshooting of the ESXi hos…
Teach the user how to convert virtaul disk file formats and how to rename virtual machine files on datastores. Open vSphere Web Client: Review VM disk settings: Migrate VM to new datastore with a thick provisioned (lazy zeroed) disk format: Rename a…
Advanced tutorial on how to run the esxtop command to capture a batch file in csv format in order to export the file and use it for performance analysis. He demonstrates how to download the file using a vSphere web client (or vSphere client) and exp…

773 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