HP-UX ramdisk/memFS

[Lou Palladino_1]

All
We are running some benchmarking tests for a software application and I was asked about a ramdisk for HP-UX. I understand there is a non-supported way to do this (loading the ramdisk driver in the kernel), but I came across this document: http://docs.hp.com/en/11885/MemFSv2forHP-UX11iv2.pdf

It makes reference of a "memfs" that looks much easier to set up than an actual ramdisk. However, when I use "mount -F memfs", I get:
mount: memfs : Invalid argument I also do not see either memfs kernel tunable discussed in the doc available on my system.

The document doesn't mention any additional packages one might need for this, other than 11.23 OS. I can't find much info googling it either.

Am I missing something? Has anyone else tried this?

Thanks.

[A. Clay Stephenson]

You don't have memfs on 11.23 "out of the box". You must install PHCO_36802 first.

[A. Clay Stephenson]

I also assume that you have installed the MemFS bundle.

[Lou Palladino_1]

Hi
Thanks for the reply.

I guess that's what I'm trying to find out. I applied the fix you mentioned. Where is the MemFS bundle?

Lou

[melvyn burnard]

The first release of MemFs was last year, but it was a limited release, not generally available.
Version 2.0 of MemFs should become generally available sometime this month I am led to believe

[John Scheller]

If consistent, fast access times are requirements for your benchmark testing, it should be noted that MemFS uses buffer cache and it will swap to physical disk (system swap space) when there is a need for more memory resources. On the other hand, a ramdisk setup insures the data placed in memory will remain in memory no matter how busy the server becomes.

There is a software product called RamDisc Plus that manages ramdisk filesystems in a SAM like menus. More information can be found here:
http://www.ramdisc.com

John

[melvyn burnard]

MemFS (Base) on 11.23 has now been released.
You can download this from:

http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=MemFS

The manual MemFS 2.0 Administrator's Guide is available for download from:
http://www.docs.hp.com/en/5992-2360/5992-2360.pdf