upgrade 11i

[Alberto Hurtado]

good afternoon
I have a k570 with 11.0 with problems of bottle neck in memory and swaping considerably. I am thinking make a upgrade to 11i, my question is if this could bring me bigger problems of memory and swap
Thank's in advance

Alberto

p.d. Phis Memory 3587.2 Mb and 19092 Mb Swap area
Hwd mod. 9000/899/K570

[Sridhar Bhaskarla]

Hi,

In fact, 11i needs more memory than 11.0 for the system activities. But it manages buffer cache better.

Look at the following document for more details on requirements for 11i.

http://docs.hp.com/hpux/onlinedocs/5187-4505/5187-4505.html.

If your application does really need memory, then you will have to upgrade your memory. May be it's the time you consider buying a better server like L-class or so.

One of the major offenders of memory is buffer cache. Make sure your dbc_max_pct is not at 50%. That's the default value. For you, you would need around 10-15%.

-Sri

[Shaikh Imran]

Hi,
HP-UX 11i requires a system having:
1)64 MB memory, minimum.
2)128 MB swap space for updating or cold-installing.
3)4GB root disk, minimum, when installing or updating to HP-UX 11i,with or without an OE. This can be a single disk drive or combination of physical disks configured as one root volume.
For all other informations download this pdf

http://docs.hp.com/hpux/pdf/B2355-90703.pdf
But for your case i will advise you to better upgrade you hardware resources than upgrading the O.S. since you are already facing problems with memory & swap bottleneck

Regards,

[Tim D Fulford]

1 - Buy more memory
2 - Increase swap so that swap > memory + kernel AT LEAST
3 - Then think about upgrading to 11i v1

upgrading (or down grading) the OS will not change the fundamental problem you are having, dont let the issue get fudged and blured with other work (though you may be able to dove-tail the work and reduce outages)

Regards

Tim

[Alberto Hurtado]

Thank you very much to all
Alberto

[Todd McDaniel_1 · Accepted solution]

Tim,

I must disagree with you to a small degree on the:

2 - Increase swap so that swap > memory + kernel AT LEAST

This only matters on boxes with very small memory where you need swap as a backup for paging just incase.

On boxes as I have with upwards of 26GB and 72GB of memory, that would be very punitive... WE have swap = 25% to 40% of memory on these boxes. Depending on their activity.

However, You are correct when dealing with boxes with smaller amounts of memory.


Alberto,

Not sure 11i would help you with this problem, but wouldnt hurt to do so. I personally love 11i, if your app can deal with it. I have seen few if any problems.

Since you only have 3GB of memory, I would definintely upgrade memory first since it is the easiest...

then also make your SWAP equal in your case since you can easily get 1 disk mirrored at 9 or 18GB for that.

[Tim D Fulford]

Todd

Yes & no. We use the above rule. But one day a customer wanted to double the memory without increasing the swap size (as it would entail more work & risk). Everyone agreed that this should have been fine. However, the system at load (I'm talking about 50% CPU or so, and 70% mem & 60% swap usage) slowed down considerably. It did not stop processing or crash, but performance was POOR. HP checked it out, and really could not offer any definitive answers... we did some further work on the system and with it changed the root disks and increased swap... Problem disapeared. Since then weve seen the server at 80-85% cpu & larger memoy & swap footprint... no slow down!

That said, Alberto has 3.5 GB memory & ~18GB swap, so I think it will be fine by adding more memory

Regards

Tim

[Alberto Hurtado]

It is very pleasant to see the interest that you show to solve problems.
I have 5 K570's like this, but they really serve as application servers, separated I have a v2250 like database server with informix and SAP/R3.
When we buy these servers (6 years ago) SAP and HP designed the architecture, but we believe that already this obsolete one, we unfortunately no longer have support HP and now we should design something. We are thinking of substituting the V's for some RP's.
Thank you for their valuable opinions.

[Tim D Fulford]

Hi

If memory serves me well a V class has a tpm-c (www.tpc.org & http://www.tpc.org/tpcc/results/tpcc_v3_results.htm) value of about 50,000. You can get that type of figure out of rp7410-6 or possibly even rp3440-4 (yep 4 cpu's of PA8800 flavour). A more equivical in terms of "market placement" are the rp7420-16 (I'd guess about 200,000), or go all for the rp8420-32 (about 400,000).. that would be about 8 fold increase in speed!

Good luck