Re: unable to attach to shared memory
Hi,
a) Make sure that you have SHMBASE in your $ONCONFIG file
set correctly. For a 64-bit IDS it looks a bit short to me (in fact
it looks like inherited from a 32-bit system).
Check the Machine Specific Notes for the recommended
setting.
b) Make sure you run the failing commands in the same
environment where you have started "oninit", especially
that you use the same $ONCONFIG file and
$INFORMIXSERVER.
c) Next look at the output of "ipcs -m".
Try to use system utility "truss" (see man page) and run
the failing command with truss. You will see the shmat()
system call in the truss output. From there try to figure
out, which shmat() call goes wrong, i.e. to which SHM
segment the failing shmat() is trying to attach.
Also watch the other parameters of shmat() and try to
figure out if they are sensible (or not).
Aehm, I think this is the easiest way to analyze this.
If you're not comfortable with this you may want to open
a case with IBM Informix Tech Support.
You can also send relevant parts of the truss output for
us to look at. In that case I'll give it a try ...
Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management
owner-informix-list@iiug.org wrote on 15.09.2005 17:13:41:
> Hi All,
>
> Tech Specs: IDS 7.31.FD7
> O/S - Solaris 5.8 Generic_117350-26 sun4u sparc SUNW,Sun-Fire
>
> oncheck and onmonitor are giving errors:
>
> shmat: [22]: operating system error
> Unable to attach to shared memory.
>
>
> onstat -g seg gives>
> Informix Dynamic Server Version 7.31.FD7 -- On-Line -- Up 07:31:10
-- 8809472 Kbytes
>
> Segment Summary:
> id key addr size ovhd class
blkused blkfree
> 100 1381386241 a000000 1811939328 56184 R* 219850
1334
> 102 1381386243 fffffffdd0000000 2930769920 45384 V 356614
1146
> 101 1381386242 fffffffe7ec00000 4278190080 65944 V 160399
361841
> Total: - - 9020899328 - - 736863
364321
>
> (* segment locked in memory)
>
> Memory Onconfig params.
>
> SHMBASE 0xa000000 # Shared memory base address
> SHMVIRTSIZE 7040000 # initial virtual shared memory segment size
> SHMADD 32000 # Size of new shared memory segments
(Kbytes)
> SHMTOTAL 10540000 # Total shared memory (Kbytes). 0=>unlimited>
> /etc/system parameters
>
> *
> set enable_sm_wa = 1
> *set shmsys:shminfo_shmmax=268435456
> set shmsys:shminfo_shmmax=4294967295
> 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
>
> Any ideas?
>
> TIA,
> Zev Berezin
> sending to informix-list
sending to informix-list