?
Solved

VMWare Memory Issue with Heavy SQL Server queries

Posted on 2009-07-10
6
Medium Priority
?
347 Views
Last Modified: 2012-05-07
Scenario: We have 2 guest systems one is a file sharing server, and the other is a SQL server. Both systems, have memory allocated, and are attached to a SAN.



Problem: We are running intense queries to this SQL Server also we are importing information from files that are located on the File Server into a SQL database that is located on another ESX server.

Issue:
What we are seeing is the file that we are trying to import into our SQL database *(SQL Server is located on a Different ESX Server).
Is getting Information injected from the intense query.

NOTE: The only file with the injected information is the one that is being loaded into memory.

If we reboot the File Server we can go back and check the file in question and see that the file will no longer have the injected information.

We can also stop all queries and imports and only execute the queries. Once the memory block, for which the file that has the injected information gets over written, we can then open the file in question and see that the injected information will no longer be there.

Has anyone seen this before any help would be great?

Thanks
0
Comment
Question by:Phytech Admin
[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
  • 4
6 Comments
 
LVL 19

Expert Comment

by:vmwarun - Arun
ID: 24828533
How have you configured your LUNs ? Is the LUN visible to both ESX Hosts ?
0
 

Author Comment

by:Phytech Admin
ID: 24829087
Yes, LUNs are configured for Both ESX servers, the imported flat-files are being read from the LUN on the files server. We are runing iSCSI with SATA Drives
0
 

Author Comment

by:Phytech Admin
ID: 24829104
I failed to mention that the 2 Guest OS Systems are located on the same ESX Server.
The server, where we are running the import from is on another SQL Server, importing into a different database. This SQL server is located on another ESX Server.

So that theres no confusion, file means flat-files i.e. (row of data)

Please let me know if i need to put more information.
Thanks
0
Create the perfect environment for any meeting

You might have a modern environment with all sorts of high-tech equipment, but what makes it worthwhile is how you seamlessly bring together the presentation with audio, video and lighting. The ATEN Control System provides integrated control and system automation.

 
LVL 21

Expert Comment

by:za_mkh
ID: 24829292
I don't know what you are talking about specifically, but have you reindexed your DBs recently? That normally sorts out speed issues (well I'm a SQL noob) but it works for our SQL servers. We don't have issues like what you mention though.
Also have you followed best practices for configuring SQL in VM?
http://communities.vmware.com/docs/DOC-8964
http://technet.microsoft.com/en-gb/library/cc966534.aspx
Another thing is that I think you may be hitting an IO limit with your storage (ISCSI with SATA). SATA itself is not great for heavy loads, proven, though it works. It depends on how your underlying storage on which your VMFS volume is configured, ex how many spindles, etc.
Do you have dedicated NICs on your ESX Hosts for ISCSI traffic (with hopefully a dedicated switch for ISCSI traffic) or are all your guests and server sharing the same NIC ports, etc ... this could also be another area to look at.
0
 

Author Comment

by:Phytech Admin
ID: 24833089
We have dedicated NICs on the ESX hosts for ISCSI traffic and a dedicated switch,
all are guests are using one nic for the data network traffic they are not connected to the iSCSI network.
0
 

Accepted Solution

by:
Phytech Admin earned 0 total points
ID: 25180817
Each port on the storage processor is considered a target.
 
For example  a0 and b0 are on 192.168.1.1 network
If  a1 and b1 are on the same 192.168.1.1 subnet then a1 target becomes an initiator
and tries to log into the a0 port now we have a loop that is ping ponging the port up and down .
 
Now if we have 2 subnets per pair
 
A0 and B0 are on 192.168.1.1
And A1 and B1 are on 192.168.2.1
Then we have no conflicts target versus initiator.
0

Featured Post

Portable, direct connect server access

The ATEN CV211 connects a laptop directly to any server allowing you instant access to perform data maintenance and local operations, for quick troubleshooting, updating, service and repair.

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 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…
Teach the user how to edit .vmx files to add advanced configuration options Open vSphere Web Client: Edit Settings for a VM: Choose VM Options -> Advanced: Add Configuration Parameters:
Teach the user how to configure vSphere Replication and how to protect and recover VMs Open vSphere Web Client: Verify vsphere Replication is enabled: Enable vSphere Replication for a virtual machine: Verify replicated VM is created: Recover replica…
Suggested Courses

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