HP-UX 10.20, IDS7.31 and KAIO problem

I decided to add KAIO to a long working K400 on HP-UX 10.20. The IDS is utilizing KAIO, but now my runque (uptime load average) ranges from 35 to 62 all day with users on the system. I have never seen an uptime load average of 62 till now. All other performance metrics from sar show a machine being used but not thrashed like the load average indicates. We are not swapping, there is 250MB free memory,the CPU's run 15-20% idle, the Autoraids run 50-70% busy during peak 30-40% otherwise the dbspaces and chunks are accross 2 Autoraids. Has anyone seen this type of behavior with KAIO any IDS on HP-UX 10.20? The system seems just fine otherwise. I have a support call into Informix since last week and no answer. I have had HP on the box saying talk to the Informix folks. Now I'm asking the world.

Wow...thats a busy machine. You didn't mention the IDS version. I have IDS 7.31.UC2 on a K260 w/ HP-UX 10.20. The only thing I have ever noticed about KAIO is that things are faster when its enabled.....I've never had a problem. KAIO is only useful for raw devices....not cooked. Are your database chunks raw? I've got 30 gigs on an HP Model 20 Nike Array w/ all raw chunks via LVM. My uptimes are never above 5. There are several flavors of KAIO. Take a peek into your online.log and look for the last time you bounced the instance. Mine says: 13:05:07 HPUX Version B.10.20 -> Using flag/select style KAIO KAIO uses /dev/async. Was this built properly? Check your release notes. The type of KAIO you are using would probably help in determining the problem. HTH Allen "Phillippe J. Welsh" wrote: > > I decided to add KAIO to a long working K400 on HP-UX 10.20. The IDS is > utilizing KAIO, but now my runque (uptime load average) ranges from 35 > to 62 all day with users on the system. I have never seen an uptime load > average of 62 till now. All other performance metrics from sar show a > machine being used but not thrashed like the load average indicates. We > are not swapping, there is 250MB free memory,the CPU's run 15-20% idle, > the Autoraids run 50-70% busy during peak 30-40% otherwise the dbspaces > and chunks are accross 2 Autoraids. Has anyone seen this type of > behavior with KAIO any IDS on HP-UX 10.20? The system seems just fine > otherwise. I have a support call into Informix since last week and no > answer. I have had HP on the box saying talk to the Informix folks. Now > I'm asking the world.

allenj wrote: > Wow...thats a busy machine. > > You didn't mention the IDS version. Sorry for the delay, I have been out of town. Informix Dynamic Server Version 7.31.UC2A is the version inquestion. > > > I have IDS 7.31.UC2 on a K260 w/ HP-UX 10.20. The only thing I have > ever noticed about > KAIO is that things are faster when its enabled.....I've never had a > problem. > > KAIO is only useful for raw devices....not cooked. Are your database > chunks raw? I've got 30 gigs on an HP Model 20 Nike Array w/ all raw > chunks via LVM. My uptimes are never above 5. I am using all raw LVM'ed dbspaces and chunks. > > > There are several flavors of KAIO. Take a peek into your online.log and > look for the > last time you bounced the instance. Mine says: > > 13:05:07 HPUX Version B.10.20 -> Using flag/select style KAIO 19:58:34 HPUX Version B.10.20 -> Using flag/select style KAIO is what mylog shows also. > > KAIO uses /dev/async. Was this built properly? Check your release > notes. > Followed the release notes. onstat -g iov shows: Informix Dynamic Server Version 7.31.UC2A -- On-Line -- Up 17 days 18:50:21 -- 218016 Kbytes AIO I/O vps: class/vp s io/s totalops dskread dskwrite dskcopy wakeups io/wup errors kio 0 i 0.0 0 0 0 0 0 0.0 0 kio 1 i 56.7 35271694 33926324 1345370 0 61384047 0.6 0 kio 2 i 0.0 0 0 0 0 0 0.0 0 kio 3 i 53.4 33235021 31923112 1311909 0 56755231 0.6 0 kio 4 i 45.3 28154613 27076607 1078006 0 50379181 0.6 0 msc 0 i 0.9 536456 0 0 0 532696 1.0 0 aio 0 i 0.2 116768 1584 108991 0 113722 1.0 0 aio 1 i 0.1 81822 4343 77405 0 82538 1.0 0 aio 2 i 0.1 58477 61 58302 0 58925 1.0 0 aio 3 i 0.1 43828 44 43783 0 44035 1.0 0 aio 4 i 0.1 31926 6 31918 0 32248 1.0 0 ... > > The type of KAIO you are using would probably help in determining the > problem. > > HTH > > Allen > > "Phillippe J. Welsh" wrote: > > > > I decided to add KAIO to a long working K400 on HP-UX 10.20. The IDS is > > utilizing KAIO, but now my runque (uptime load average) ranges from 35 > > to 62 all day with users on the system. I have never seen an uptime load > > average of 62 till now. All other performance metrics from sar show a > > machine being used but not thrashed like the load average indicates. We > > are not swapping, there is 250MB free memory,the CPU's run 15-20% idle, > > the Autoraids run 50-70% busy during peak 30-40% otherwise the dbspaces > > and chunks are accross 2 Autoraids. Has anyone seen this type of > > behavior with KAIO any IDS on HP-UX 10.20? The system seems just fine > > otherwise. I have a support call into Informix since last week and no > > answer. I have had HP on the box saying talk to the Informix folks. Now > > I'm asking the world.