Reverse Sequential

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Reverse Sequential

Mark_Lindholm

Has anyone modified the IOMETER Windows version to do a reverse sequential transfer?

 

Mark Lindholm

 


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Re: Reverse Sequential

Jose Medeiros-2
I've heard of inaccuracies when using Iommeter to measure throughput with in Vmware ESX / Vsphere, can any one confirm this? http://www.confio.com/

Jose


From: "[hidden email]" <[hidden email]>
To: [hidden email]
Sent: Wednesday, November 9, 2011 11:59 AM
Subject: [Iometer-user] Reverse Sequential

Has anyone modified the IOMETER Windows version to do a reverse sequential transfer?
 
Mark Lindholm
 

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Re: Reverse Sequential

abappanadu

Hi Jose,

There are no issues with Iometer running on Windows VMs on vSphere.

 

However, there are issues with Iometer running on a Linux VM on vSphere.

A fix has been submitted and the issue will be resolved in the next Iometer release.

 

Thanks,

Aravind

 

From: Jose F. Medeiros [mailto:[hidden email]]
Sent: Wednesday, November 09, 2011 12:47 PM
To: [hidden email]; [hidden email]
Subject: Re: [Iometer-user] Reverse Sequential

 

I've heard of inaccuracies when using Iommeter to measure throughput with in Vmware ESX / Vsphere, can any one confirm this? http://www.confio.com/

 

Jose

 


From: "[hidden email]" <[hidden email]>
To: [hidden email]
Sent: Wednesday, November 9, 2011 11:59 AM
Subject: [Iometer-user] Reverse Sequential

Has anyone modified the IOMETER Windows version to do a reverse sequential transfer?

 

Mark Lindholm

 


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Re: Reverse Sequential

Jose Medeiros-2
Thank you for the reply, my concerns were  erroneous inaccuracies in the data transfer rates.

Jose


From: Aravind Bappanadu <[hidden email]>
To: Jose F. Medeiros <[hidden email]>; "[hidden email]" <[hidden email]>; "[hidden email]" <[hidden email]>
Sent: Wednesday, November 9, 2011 1:17 PM
Subject: RE: [Iometer-user] Reverse Sequential

Hi Jose,
There are no issues with Iometer running on Windows VMs on vSphere.
 
However, there are issues with Iometer running on a Linux VM on vSphere.
A fix has been submitted and the issue will be resolved in the next Iometer release.
 
Thanks,
Aravind
 
From: Jose F. Medeiros [mailto:[hidden email]]
Sent: Wednesday, November 09, 2011 12:47 PM
To: [hidden email]; [hidden email]
Subject: Re: [Iometer-user] Reverse Sequential
 
I've heard of inaccuracies when using Iommeter to measure throughput with in Vmware ESX / Vsphere, can any one confirm this? http://www.confio.com/
 
Jose
 

From: "[hidden email]" <[hidden email]>
To: [hidden email]
Sent: Wednesday, November 9, 2011 11:59 AM
Subject: [Iometer-user] Reverse Sequential
Has anyone modified the IOMETER Windows version to do a reverse sequential transfer?
 
Mark Lindholm
 

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Re: Reverse Sequential

Gruher, Joseph R

One gotcha with VMWare is if you try and read an area of disk you have not yet written you’ll receive unrealistically high transfer rates.  I believe this is a side effect of thin provisioning.  If the OS knows no data has yet been written to that area of disk it won’t actually go read data from the disk, it’ll just return junk data from memory and you’ll see very high speeds.  You want to write out data to the whole disk area under test before reading data in.

 

-Joe

 

From: Jose F. Medeiros [mailto:[hidden email]]
Sent: Wednesday, November 09, 2011 6:13 PM
To: Aravind Bappanadu; [hidden email]; [hidden email]
Subject: Re: [Iometer-user] Reverse Sequential

 

Thank you for the reply, my concerns were  erroneous inaccuracies in the data transfer rates.

 

Jose

 


From: Aravind Bappanadu <[hidden email]>
To: Jose F. Medeiros <[hidden email]>; "[hidden email]" <[hidden email]>; "[hidden email]" <[hidden email]>
Sent: Wednesday, November 9, 2011 1:17 PM
Subject: RE: [Iometer-user] Reverse Sequential

Hi Jose,

There are no issues with Iometer running on Windows VMs on vSphere.

 

However, there are issues with Iometer running on a Linux VM on vSphere.

A fix has been submitted and the issue will be resolved in the next Iometer release.

 

Thanks,

Aravind

 

From: Jose F. Medeiros [mailto:[hidden email]]
Sent: Wednesday, November 09, 2011 12:47 PM
To: [hidden email]; [hidden email]
Subject: Re: [Iometer-user] Reverse Sequential

 

I've heard of inaccuracies when using Iommeter to measure throughput with in Vmware ESX / Vsphere, can any one confirm this? http://www.confio.com/

 

Jose

 


From: "[hidden email]" <[hidden email]>
To: [hidden email]
Sent: Wednesday, November 9, 2011 11:59 AM
Subject: [Iometer-user] Reverse Sequential

Has anyone modified the IOMETER Windows version to do a reverse sequential transfer?

 

Mark Lindholm

 


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Register now
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Re: Reverse Sequential

Jose Medeiros-2
Good to know, that must be what a presenter at the Microosft SQL user group meeting was referring too.

Jose :-)


From: "Gruher, Joseph R" <[hidden email]>
To: Jose F. Medeiros <[hidden email]>; Aravind Bappanadu <[hidden email]>; "[hidden email]" <[hidden email]>; "[hidden email]" <[hidden email]>
Sent: Wednesday, November 9, 2011 6:16 PM
Subject: RE: [Iometer-user] Reverse Sequential

One gotcha with VMWare is if you try and read an area of disk you have not yet written you’ll receive unrealistically high transfer rates.  I believe this is a side effect of thin provisioning.  If the OS knows no data has yet been written to that area of disk it won’t actually go read data from the disk, it’ll just return junk data from memory and you’ll see very high speeds.  You want to write out data to the whole disk area under test before reading data in.
 
-Joe
 
From: Jose F. Medeiros [mailto:[hidden email]]
Sent: Wednesday, November 09, 2011 6:13 PM
To: Aravind Bappanadu; [hidden email]; [hidden email]
Subject: Re: [Iometer-user] Reverse Sequential
 
Thank you for the reply, my concerns were  erroneous inaccuracies in the data transfer rates.
 
Jose
 

From: Aravind Bappanadu <[hidden email]>
To: Jose F. Medeiros <[hidden email]>; "[hidden email]" <[hidden email]>; "[hidden email]" <[hidden email]>
Sent: Wednesday, November 9, 2011 1:17 PM
Subject: RE: [Iometer-user] Reverse Sequential
Hi Jose,
There are no issues with Iometer running on Windows VMs on vSphere.
 
However, there are issues with Iometer running on a Linux VM on vSphere.
A fix has been submitted and the issue will be resolved in the next Iometer release.
 
Thanks,
Aravind
 
From: Jose F. Medeiros [mailto:[hidden email]]
Sent: Wednesday, November 09, 2011 12:47 PM
To: [hidden email]; [hidden email]
Subject: Re: [Iometer-user] Reverse Sequential
 
I've heard of inaccuracies when using Iommeter to measure throughput with in Vmware ESX / Vsphere, can any one confirm this? http://www.confio.com/
 
Jose
 

From: "[hidden email]" <[hidden email]>
To: [hidden email]
Sent: Wednesday, November 9, 2011 11:59 AM
Subject: [Iometer-user] Reverse Sequential
Has anyone modified the IOMETER Windows version to do a reverse sequential transfer?
 
Mark Lindholm
 

------------------------------------------------------------------------------
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Register now
http://p.sf.net/sfu/rsa-sfdev2dev1
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