Tool for benchmark local disk vs. iSCSI

2008-12-04 Thread Ewald Jenisch
Hi,

To gain an understanding on the performance of iSCSI vs. local disk IO
I'm looking for a tool.

My first thought was about iozone...

Any other ideas?

Thanks much in advance for your help,
-ewald

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Re: Tool for benchmark local disk vs. iSCSI

2008-12-04 Thread Wojciech Puchar


To gain an understanding on the performance of iSCSI vs. local disk IO
I'm looking for a tool.

My first thought was about iozone...

Any other ideas?


for linear transfer:dd


of course iSCSI disk will always be slower
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Re: Tool for benchmark local disk vs. iSCSI

2008-12-04 Thread Ivan Voras
Ewald Jenisch wrote:
 Hi,
 
 To gain an understanding on the performance of iSCSI vs. local disk IO
 I'm looking for a tool.
 
 My first thought was about iozone...

iozone is ok, but a little complex to run. Any disk benchmark will be ok
- bonnie++, blogbench, etc. but each has an emphasis on a different
aspect of the system. I think bonnie++ will be the simplest in your case.

Make sure you know what you're benchmarking - for example if the iSCSI
drive (target) is hosted as a file in a regular file system, it will be
overly (and dangerously) cached on the server.



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Re: Tool for benchmark local disk vs. iSCSI

2008-12-04 Thread Vincent Hoffman
Ewald Jenisch wrote:
 Hi,

 To gain an understanding on the performance of iSCSI vs. local disk IO
 I'm looking for a tool.

 My first thought was about iozone...
   
bonnie++ is ok too.
 Any other ideas?

 Thanks much in advance for your help,
 -ewald

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Re: Tool for benchmark local disk vs. iSCSI

2008-12-04 Thread Wojciech Puchar


My first thought was about iozone...


iozone is ok, but a little complex to run. Any disk benchmark will be ok
- bonnie++, blogbench, etc. but each has an emphasis on a different
aspect of the system. I think bonnie++ will be the simplest in your case.

can bonnie++ operate on raw device not filesystem?

he asked about disk benchmarked not disk+filesystem



Make sure you know what you're benchmarking - for example if the iSCSI
drive (target) is hosted as a file in a regular file system, it will be
overly (and dangerously) cached on the server.



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Re: Tool for benchmark local disk vs. iSCSI

2008-12-04 Thread Ivan Voras
Wojciech Puchar wrote:

 My first thought was about iozone...

 iozone is ok, but a little complex to run. Any disk benchmark will be ok
 - bonnie++, blogbench, etc. but each has an emphasis on a different
 aspect of the system. I think bonnie++ will be the simplest in your case.
 can bonnie++ operate on raw device not filesystem?
 
 he asked about disk benchmarked not disk+filesystem
 

Sorry, you're right.



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