topic Odd or Even Striping in Operating System - HP-UX

Odd or Even Striping

Vishu — Thu, 03 Mar 2011 11:58:13 GMT

Hi Gurus,

One query, I would like to make a volume in HP-UX for database. But i am confused in striping stuff now. Please help in below queries:

1) is ODD striping (3-way) is good or Even Striping (4-way)?
2) What is the difference mainly between these two. Which provide better I/O performance?

Thanks
Vishu

Re: Odd or Even Striping

Torsten. — Thu, 03 Mar 2011 12:09:55 GMT

I would say this depends on the hardware used.

Do you have any kind of disk array or just plain disks?

Do you want to mirror?

If yes, what is your OS version?

Re: Odd or Even Striping

Vishu — Thu, 03 Mar 2011 12:24:24 GMT

Hi Torsten,

Model is rp4440 and OS version is 11.11. I have XP array attached.

Well, if asked in general terms, which is the best striping between them. should we go for 3-way striped or 4-way normally and why?

Re: Odd or Even Striping

Torsten. — Thu, 03 Mar 2011 12:33:31 GMT

Now it depends on how the XP is configured and how many LUNs (or LUSE) you did present to the server.

The XP can do likely much better striping than you can force it from the server side.

Re: Odd or Even Striping

Torsten. — Thu, 03 Mar 2011 12:40:31 GMT

You can do so many performance related task on your XP - you should discuss this with your HP consultant.

However, in most cases your poor little server itself will be the bottleneck, regardless what you do.
In simple words - if you write something to the XP, the array will cache the data and say "OK, done" before writing a single bit. All in cache.

As said, discuss this with your HP representative.