HP-UX Tuning for I/O Operation

[GSB_3]

One of our application recommends the following tuning to be performed on HP-UX 11.31 OS. Can you please provide me the command & steps to make these changes

- Make the input and output (I/O) operations as fast as possible. The readahead protocol, offered by most operating systems, can greatly improve performance. This protocol allows you to set the size of each I/O operation.
Usually its default value is 4 to 8 kilobytes which is too small. Set it to at least 64K on most platforms

- Make the input and output operations as fast as possible. For example, the asynchronous I/O, offered by most operating systems, can greatly improve performance. Turn on the asynchronous I/O.

Thanks
Gab

[V. Nyga]

Hi,

check this documentation (also it's an old one):
http://docs.hp.com/en/1219/tuningwp.html

and also this thread:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1176650

Volkmar

[john123]

I am not aware of any specific tuning options avilable in HP UX 11.31 for this..

But basically if you are using a VXFS filesystem , read ahead and write behind stuffs can be configred by using vxtunefs command..also tune your buffer cache to an appropriate value..

And about asyncronus I/O this can be done by using the mount option convosync=

HTH
John

[Venkatesh BL]

This could be useful: http://www.docs.hp.com/en/5576/JFS_Tuning.pdf

[V. Nyga]

more docs can be found here: http://docs.hp.com/en/

V.