memory requirements for HP-UX 11.

[Paul Dray]

To All.

I understand memory required on a HP-UX 11 operating system is up to two time due to the 64 bit access.

I am up grading a K class from 10.20, but by virgin installing HP-UX 11.00 as a 32 bit machine, then reinstalling the application code and databases.

will I have to consider providing more physical memory ?

[CHRIS_ANORUO]

You need from 1Gb of Phy memory.

[John Palmer]

Running HP-UX 11 32 bit on a K server won't require much more memory than 10.20.

If you intend running the same applications and don't currently have a problem with memory then no you don't need any more RAM.

[Stefan Farrelly]

Heres the lowdown on memory requirement for 11/32/64;

This complete document can be viewed at
http://www.docs.hp.com/hpux/content/osfaq.html

HP-UX 11.00 Frequently Asked Questions

Q: What are the RAM and disk requirements of 11.x?
A: 11.00 32-bit and 64-bit can boot with as little as 64MB RAM and 1GB
disk,
but the performance would be very slow. Here are the recommended
minimums:
11.00 32-bit: 128MB RAM, 1-2GB disk
11.00 64-bit: 512MB RAM, 2-3GB disk
The 11.00 64-bit system doesn't require twice the disk space of an
11.00 32-bit system.
The size of the 64-bit executable has been optimized since 10.x and has
shown modest growth.

As mentioned earlier, the full benefits of 64-bit computing will not be
realized until a system
has more than 4GB RAM and large amounts of swap space (4GB and higher).
This is the first step in exploiting the large memory address space
that 64-bit provides.

Q: What additional system resources are recommended for 64-bit HP-UX 11.00?
A: The additional resources required by 64-bit HP-UX 11.00 are:
Add extra disks to provide more than 4 GB of swap
Add memory cards to provide more than 4 GB of memory
Increase kernel parameters
maxdsiz more than 0x40000000
maxdsiz_64bit more than 0x400000000
maxswapchunks 10000

[Andy Monks]

At the end of the day the amount of physical memory you require depends on your application. The O/S requires a small amount (depending on kernel parameters), but usually under 20-30mb.

If your using the latest 64 bit version of SAP, each SAP process can use upto 2GB of virtual memory. Obviously you'd do most of this using swap space, but that's slower. One machine I worked on recently had 8GB of ram an 32GB of swap.

I've also seen a V class with 32GB of ram, with 1 user, use over 60GB of virtual memory. It was a nice modelling application.

Application vendors usually have recommendations on memory requirements for there applications, and are the best source of such info.