oninit -vy 出錯： Fatal error in shared memory creation 以及 shared memory already exists

oninit -vy 出錯： Fatal error in shared memory creation 以及 shared memory already exists[@more@]

使用 onmode -ky 關閉 informix 後，再重啟，不成功：
[19] % oninit -vy
Checking group membership to determine server run mode...succeeded
Reading configuration file '/informix/ids2/etc/onconfig.wnms'...succeeded
Creating /INFORMIXTMP/.infxdirs...succeeded
Checking config parameters...succeeded
Allocating and attaching to shared memory...FAILED
oninit: Fatal error in shared memory creation

WARNING: server initialization failed, or possibly timed out (if -w was used).
Check the message log, online.log, for errors.
[20] % onstat -m

IBM Informix Dynamic Server Version 11.50.FC6WE -- On-Line -- Up 1 days 19:22:33 -- 1267556 Kbytes

Message Log File: /informix/ids2/online.log

16:50:13 Checkpoint Completed: duration was 0 seconds.
16:50:13 Sun Feb 28 - loguniq 5, logpos 0x3f8e018, timestamp: 0x6f759 Interval: 348

16:50:13 Maximum server connections 1
16:50:13 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 2, Llog used 2

17:05:22 Checkpoint Completed: duration was 0 seconds.
17:05:22 Sun Feb 28 - loguniq 5, logpos 0x3f90018, timestamp: 0x6f769 Interval: 349

17:05:22 Maximum server connections 1
17:05:22 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 2, Llog used 2

17:07:49 IBM Informix Dynamic Server Started.
17:07:49 Warning: The IBM IDS Workgroup Edition license restriction limits
17:07:49 the total shared memory size for this server to 16777216 KB.
17:07:49 The size has been reset to the limit to bring up the database server.
17:07:49 shmget: [EEXIST][17]: key 52584801: shared memory already exists
17:07:49 mt_shm_init: can't create resident segment

從 得知：
onmode -ky 後 informix 仍佔有共享記憶體

一、解決過程如 http://bbsanwei.javaeye.com/blog/370745 所述

wx-dev% ipcs -m |grep -v grep |grep informixm 16385 0x52594801 --rw-rw---- root informix
m 16386 0x52594802 --rw-rw---- root informix
m 16387 0x52594803 --rw-rw---- root informix
m 16388 0x52594804 --rw-rw---- root informix
m 16389 0x52594805 --rw-rw---- root informix
m 21512 0x52594806 --rw-rw---- root informix
m 7181 0x52594807 --rw-rw---- root informix
m 7182 0x52594808 --rw-rw---- root informix
m 7183 0x52594809 --rw-rw-rw- root informix

wx-dev% ipcrm -m 16385 16386 16387 16388 16389 21512 7181 7182 7183

二、
在文章： 中提到：在 IDS 11.5 xC4 後提供了 onclean 命令來清除共享記憶體。
（The onclean utility attempts to clean up shared memory, semaphores, and stops database server virtual processes. ）
以及使用 onshutdown.sh(unix) 或 onshutdown.bat(windows) 來停止 informix 服務。
（The onshutdown script first runs the onmode -ky command, and then after a specified wait time, runs the onclean -ky command.）
但是，我使用 onclean 不能清除共享記憶體。

三、
我以前看過一篇文章，上面曾經給出用配置引數 SERVERNUM 計算共享記憶體地址的方法，但現在找不到那篇文章了。所以我認為透過修改配置引數 SERVERNUM 也應該可以重啟informix 的。（試驗沒成功，估計是記憶體重疊的原因）