ASM buffer sizes

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1

I am running 11.2.0 HF1 on a 3900, and I have an application that does file transfers. Right now all the files are fairly small maybe a couple MB. However there is a new use case that might have people downloading and uploading files that are anywhere from 100mb - 1GB.

In looking at the ASM I seen that in the advanced parameters there is the request_buffer_size, which is set to 10mb by default and it appears has a max limit of 20mb. There is the ResponseBufferSize which looks to be set to about 130mb by default and I have not found a max limit for that yet.

So my question is does this mean that ASM can’t support a file upload of more than 20mb? It would appear so by what I am seeing but maybe I am misunderstanding something. Also does anyone know if there is an upward limit for the Response. Lastly does anyone have a case where you are moving larger files through an ASM, I am somewhat concerned about performance and if anyone has any experiece with this or has recommendation on max file sizes to allow through ASM I would appreciate it.

Mike

2

For Requests:

If you want to upload files bigger than 20mb, you have to disable “Request length exceeds defined buffer size” for the policy.

For Response:

???

Adds:

Is it a web service? Attention with the value of “total_xml_memory”

ICAP doesn’t work with bigger files than 20mb.

I’ve never tried such big uploads :wink:

You should test it --> following the systems memory allocation while uploading.

regards

3

Torti,

Thanks for the quick response.

So if I disable the ASM block but the buffer is still set to 20mb will ASM just ignore that buffer setting and load the whole message into memory for inspection or do I loose inspection of larger request entirely?

It is not a web service it is an HTTPS page that allows for file uploads and downloads.

I am not planning on using ICAP here as the application has measures to ensure file integrity

I plan on testing system resourecs in my lab

4

Hi,

I don’t know if it applies also to 11.2, but this is a KB that maybe will be useful to this case.

Best regards

5

update:

If anyone is planning to scan file uploads bigger than 20mb with ASM --> use a AV proxy behind the f5.

There is no really useful option to do this with the ASM, although they actually did bind ICAP to LTM.

But this is a bad design.

Using an AV proxy is much easier.

regards