SUMMARY: Location of Shared Memory

From: Claudia Miller (
Date: Thu Feb 05 1998 - 17:11:26 CST

Original message:
Claudia Miller wrote:
> I've installed Enterprise Pro v3.01 with Informix on my Ultra2 Enterprise Server
> Solaris 2.6
> I was able to configure my kernel to set Shared memory parameters and
> kernel parameters as requested in the Informix documentation.
> went into /etc/system and pasted the following:
> set enable_sm_wa = 1
> set shmsys:shminfo_shmmax=268435456
> set semsys:seminfo_semmap=64
> set semsys:seminfo_semmni=4096
> set semsys:seminfo_semmns=4096
> set semsys:seminfo_semmnu=4096
> set semsys:seminfo_semume=64
> set semsys:seminfo_semmsl=100
> set shmsys:shminfo_shmmin=100
> set shmsys:shminfo_shmmni=100
> set shmsys:shminfo_shmseg=100
> I'm also supposed to do the following and I can't find anything
> that says how to do this:
> Location of shared memory
> 0x0A000000L
> The last thing is -- after I did the first part of this -- whenever I reboot I
> get a message during booting:
> "enable_sm_wa = 1 not defined in the kernel" (that's the first item above)
> When I go to start the database I'm getting the following error message:
> "Fatal error Shared memory initialization"

Thanks to all who responded.
       Stephen P Richardson <> (Ron Spillane)
       Ju-Lien Lim <>
       Shubin Wang <>
       Kwok Tang <>

Well, this turns out to be one of those "I can't believe I'm so stupid" things.
I hadn't changed my /etc/ system file before I installed Informix for the first
time. So, after I cut and paste the above text into my /etc/system file
(deleting "set enable_sm_wa = 1") I reinstalled informix. I did boot -r. What
I didn't do was delete the informix directory and the informix temp directory
before reinstalling.

I got alot of useful suggestions, some of which are below:

From: Stephen P Richardson <>
I don't have the answers that you request, but I'm pretty sure that
   the problem is not the starting address, nor is it that first
   I just wanted to warn you that this line:
> set shmsys:shminfo_shmmin=100
   can cause problems with applications that only need a small shared
   memory segment. In particular APC's PowerChute will not start if
   this is set as shown. I have found that the default value - which
   I believe is 0 (or maybe 1?) works just fine with Informix.

   I think that the Informix install instructions are still written as
   they were for the Solaris 2.1 install - which was considerably more
   tricky than is required by current versions of Solaris.
From: (Ron Spillane)
the entry for set enable_sm_wa = 1
was only requiered for solaris 2.3 or 2.4 so you
should remove this entry from /etc/system, we are
running informix without that entry and it works fine.
From: Kwok Tang <>
You don't need the "set enable_sm_wa = 1" parameter for Solaris 2.5 or

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