We are using HP-UX Itanium version B.11.31 and this server is used for running Sybase database version ASE15.7. I would like to know how to enable Asynchronous IO at Operating System level.
I went through Sybase ASE and their suggestion is provided at this link.
Appreciate your valuable input as which one should be chosen. I feel it should be "Enabling Asynchronous I/O for File System Devices."
Database is stored in the file system and they are VxFS(Veritas File System)
Looks like the three pages are somewhat poorly titled.
"Enabling Asynchronous Disk I/O HP-UX" page describes the installation of the asynchronous I/O driver. It would be definitely needed if you wanted to use asynchronous I/O with raw devices, but you aren't planning to do that.
I found this link to an old HP Knowledge Mine document that confirms that the asyncdisk driver is for raw disk access only.
"Enabling Asynchronous I/O for File System Devices" page describes a pair of HP-UX kernel tunables as a prerequisite, but the actual task seems to be how to enable Sybase to use HP-UX asynchronous file I/O, assuming it's available.
"Enabling Asynchronous I/O for File Systems" page describes how to make sure HP-UX can provide asynchronous file I/O. It says "you need to have OnlineJFS installed". Basically, this page should have been a part of the "prerequisites" section of the previous page.
