KAIO: HP-UX 10.20 / IDS 7.24
Colin Taberman asked for real-world experience with KAIO on HP-UX 10.20 and IDS 7.24. Rudy Fernandes found I/O 25-50% better with KAIO off on 7.23/7.14. Carlson said it was backed out on 7.24.uc7, live on 7.30.uc7 and OK on 7.30.uc10, with 20-30% gain when correct. Sergey Turin ran 7.24UC4X3 with KAIO for two years, about 25% faster, after the latest patch bundle. Neil Truby warned against KAIO on 7.24.
Auto-generated by Claude from the posts below — may be imperfect; read the full thread.
I am looking to canvass option on the implementation of KAIO with HP-UX 10.20 and IDS 7.24. We are aware of "Bug: 92132 HP KAIO HAS A SIGNIFICANT I/O BOTTLENECK", however, I am looking for any practical experiences. The questions which I would appreciate a comment upon if you are a site using these O/S & Informix versions are:- Implemented KAIO: ? Tried, Used, Live, Backed Out ? Performance Experienced when implemented: ? - / + No of Processors in Server: Data Size: HP Server Model: Comments. Appreciate your help. Colin
About a year and a half ago, I carried out a series of tests to assess KAIO on HP. Here are some of the details HP Server : T-600 # Processors : 8 Informix : v 7.23 & v7.14 Tests : A mix of inserts, deletes, updates, selects aimed at getting the disk all hot and bothered. Monitored that it actually happened using glance. Results : With KAIO turned OFF, I/O performance improved by 25-50%, depending on the type of test. Also tried : Fiddling with some environment variables that, I believe, modified the type of KAIO being used - to no avail. Rudy Colin Taberman wrote: > I am looking to canvass option on the implementation of KAIO with > HP-UX 10.20 and IDS 7.24. > > We are aware of "Bug: 92132 HP KAIO HAS A SIGNIFICANT I/O > BOTTLENECK", however, I am looking for any practical experiences. The > questions which I would appreciate a comment upon if you are a site > using these O/S & Informix versions are:- > > Implemented KAIO: ? Tried, Used, Live, Backed Out ? > Performance Experienced when implemented: ? - / + > No of Processors in Server: > Data Size: > HP Server Model: > Comments. > > Appreciate your help. > > Colin
Colin Taberman wrote: > > I am looking to canvass option on the implementation of KAIO with > HP-UX 10.20 and IDS 7.24. > Always wise . . . . KAIO on the HP platform is a hit-or-miss proposition at times. > We are aware of "Bug: 92132 HP KAIO HAS A SIGNIFICANT I/O > BOTTLENECK", however, I am looking for any practical experiences. The > questions which I would appreciate a comment upon if you are a site > using these O/S & Informix versions are:- > > Implemented KAIO: ? Tried, Used, Live, Backed Out ? Currently live on HPUX 10.20 / IDS 7.30.uc7. Backed out on HPUX 10.20 / IDS 7.24.uc7 Seems to be OK in HPUX 10.20 / IDS 7.30.uc10 > Performance Experienced when implemented: ? - / + 20-30% gain when implemented correctly. > No of Processors in Server: 4 @ 90MHZ > Data Size: 20G > HP Server Model: K200 -- John Carlson Informix DBA WHSmith USA #include std_disclaimer.h /* These are my opinions, not my company's opinion */
Use kaio on Informix v7.24, and lose your job! Colin Taberman wrote in message <8649vq$8l6$1@news.xmission.com>... > > >I am looking to canvass option on the implementation of KAIO with >HP-UX 10.20 and IDS 7.24. > >We are aware of "Bug: 92132 HP KAIO HAS A SIGNIFICANT I/O >BOTTLENECK", however, I am looking for any practical experiences. The >questions which I would appreciate a comment upon if you are a site >using these O/S & Informix versions are:- > >Implemented KAIO: ? Tried, Used, Live, Backed Out ? >Performance Experienced when implemented: ? - / + >No of Processors in Server: >Data Size: >HP Server Model: >Comments. > >Appreciate your help. > >Colin
Environment HP-UX 10.20 with latest patch bundle installed (very important) Informix Dynamic Server 7.24UC4X3 KAIO is on for at least 2 years Performance increase appr.25% Server 2 CPU's (single CPU VP though) Data size 8G, OLTP apps Model K220