Hi,

I have 2 server setups, which slightly differ in specs.

Both servers are IBM x336 with RAID 1 on 2 internal disks with RHEL4
installed(2.6.9-42.0.3.ELsmp).
Both with IBM Informix Dynamic Server Version 10.00.UC5

1. One server is without hyperthreading and with a raw disk in LVM.

2. The second server is with hyperthreading and with a raw disk outside
LVM. Just plain raw.

But on the latter server(and only that one) we get this error when
running a large job in informix:
---
requested number of KAIO events (16384) exceeds limit (32)   Please
increase the value in /proc/sys/fs/aio-max-nr
---

my sysctl -a | grep aio-max-nr, says (on both machines):

fs.aio-max-nr = 65536

Is my selection of using LVM for raw disks, or the lack of KAIOOFF, etc.
 doing stuff differently? does using LVM provide these limitations?

Or what should I boost the number up to?

Sincerely
Max Andersen