Review your favorite Linux distribution.
Go Back > Forums > Enterprise Linux Forums > Linux - Enterprise
User Name
Linux - Enterprise This forum is for all items relating to using Linux in the Enterprise.


  Search this Thread
Old 12-08-2004, 09:13 AM   #1
LQ Newbie
Registered: May 2003
Posts: 16

Rep: Reputation: 0
Having problems with Kernel AIO with ASE

Hi there.

I'm having problems getting ASE 12.5.3 to run with kernel async io. We are using RH AS 3 with kernel 2.4.21-4.

Any one of you gurus have an idea on how to enable this? Is it a linux setting I have to change or a ASE config file setting?


PS: if there is anything else I forgot to add, please just ask.
Old 12-10-2004, 08:49 AM   #2
Registered: Jun 2004
Location: London
Distribution: Red Hat, SuSE, Gentoo
Posts: 80

Rep: Reputation: 15
I'm not sure if this link is of any use, but it implies that you have to have a version of ASE built for the 2.4 kernel:

A sybase PDF (here: ) implies that Async IO is enabled by default

Out of curiosity, how do you know it's _not_ running in async mode ? I'm curious becauese I have to test this shortly
Old 12-10-2004, 11:48 AM   #3
LQ Newbie
Registered: May 2003
Posts: 16

Original Poster
Rep: Reputation: 0

The ASE log file reports that its using Posix async I/O and not the preferred Kernel async I/O. As far as I know, ASE will try and use kaio when available, and if not, use posix aio.

We got a guy from Sybase into the office today. He brought along a c proggie to test if the kernel is running kaio. The test successfully determined that our RHAS is running with kaio enabled, but then way is Sybase not using it? Some reports claim that Sybase just report it incorrectly, although it does not make sense to me.

The guy from Sybase was running ASE on RH Enterprise with kaio. We are using RHAS 3 and it reports posix. The only difference we could see is that we were running a earlier version of glibc (we're running 2.3.2-95.3 and he 2.3.2-95.27, both on kernel 2.4.21-4).

Think glibc can be the reason? Where can I find the latest or at least version 2.3.2-95.27? It's worth a try.
Old 12-15-2004, 07:53 AM   #4
LQ Newbie
Registered: May 2003
Posts: 16

Original Poster
Rep: Reputation: 0
Seems like an update to your libstdc++ ca fix this problem. Where can I find the latest version of libstdc++ on a non-networked machine?


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Dell AIO 922 Jakbrud Linux - Hardware 1 12-15-2006 09:40 AM
G3 AIO video out scheidel21 Linux - Hardware 0 10-28-2005 02:18 AM
ASE master db on raw device? Andrastus Linux - Enterprise 0 12-13-2004 04:20 AM
FastPath and AIO cdotger AIX 7 04-23-2004 03:56 AM
kernel and posix AIO suman_bahuguna Red Hat 0 04-01-2004 11:27 PM > Forums > Enterprise Linux Forums > Linux - Enterprise

All times are GMT -5. The time now is 02:39 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration