Not able to stop datastage

vintipa · Post by **vintipa** » Fri Dec 19, 2008 4:40 am

hi friends,

i urgently need to stop the datastage application using command bin/uv -admin -stop. but i an getting the following error. kindly guide me to resolve this
Error:

Unable to remove the following shared memory segment(s) during shutdown:
m 1048577 0xadec7521 --rw-rw-rw- root system 111088 127264
m 3 0xadee7521 --rw-rw-rw- root system 106932 127264
Stopping JobMonApp
JobMonApp has not been started from: /dsetlsoft/Ascential/DataStage/PXEngine
2 error(s) encountered during shutdown procedure.
DataStage Engine 7.5.2.1 instance "ade" may be in an inconsistent state.

SoaresRui12 · Post by **SoaresRui12** » Fri Dec 19, 2008 6:16 am

Check if there is any job running or any client connected to DS.

chulett · Post by **chulett** » Fri Dec 19, 2008 7:52 am

Looks to me like a permissions error on the shared memory segment. Ask root to shut it (DataStage) down and see if that works.

ray.wurlod · Post by **ray.wurlod** » Fri Dec 19, 2008 2:05 pm

Always execute sync twice prior to stopping DataStage.

vintipa · Post by **vintipa** » Fri Dec 19, 2008 9:26 pm

hi Ray,

please elaborate on this : Always execute sync twice,

i have no idea how to do this.

thanks in advance.

chulett · Post by **chulett** » Fri Dec 19, 2008 11:48 pm

Type s-y-n-c (without the dashes) and press enter. Twice.

Wow, I haven't heard that advice in years.

ray.wurlod · Post by **ray.wurlod** » Sat Dec 20, 2008 2:43 pm

The UNIX sync command forces any pages in memory that have not yet been written to disk to be written to disk. This is important for DataStage engine, which makes extensive use of shared memory. The second sync command picks up any pages that might have been modified while the first sync command was running.

While the original error was about inability to remove shared memory segments cleanly - probably permissions as noted - the sync commands guarantee that even if "crowbar" techniques like ipcrm are used, the engine will at least be in a consistent state.

vintipa · Post by **vintipa** » Sun Dec 21, 2008 8:55 am

hi guys,

this issue is now resolved. your replies are very usefu.
but sorry, neither am i able to rate any reply nor am i able to mark this post as resolved.

I killed the processes with root login and then i was able to stop datastage.

thanks.[:)]

chulett · Post by **chulett** » Sun Dec 21, 2008 9:18 am

You killed what processes as root? And then did what to stop DataStage?

vintipa · Post by **vintipa** » Sun Dec 21, 2008 9:28 am

hi,

by killed the process i mean that i executed the command ipcrm -m <shmid>.

the steps that i took are as follows:
-------------------
Shared memory segments:
ipcs -mop

That will list all active shared memory segments. Not all of those are related to DataStage. But if some are (like if they are tagged with "ade") and the NATTCH column shows zero, you need to kill those:

ipcrm -m <shmid>

<shmid> is the 2nd column from the ipcs -mop command
--------------------------

i found these steps on net.

ray.wurlod · Post by **ray.wurlod** » Sun Dec 21, 2008 1:45 pm

You can also find information about the effects of potassium cyanide on the net, but you wouldn't eat it. Be very, very careful with any form of "kill".

vintipa · Post by **vintipa** » Sun Dec 21, 2008 9:42 pm

Hi Ray,

you are right. we need to be very careful.thanks for the caution friend. i found these tips very useful as they solved my problem, but please inform me if there is any damage in using these commands.

actually i have no idea of the commands like ipcs -mop and ipcrm -m <shmid>. yet to explore these commands.

ray.wurlod · Post by **ray.wurlod** » Sun Dec 21, 2008 10:06 pm

There are other things happening than shared memory segments, and this only gets more complicated when you move to version 8. The main hazard with removing the shared memory segments (other than needing the root login ID) is making sure you get them all - but then what about the semaphores and other structures? If you have the root login then executing the uv -admin -stop command will work and - as a bonus - do all that is necessary. If you want to know all the things that happen during a shutdown of DataStage, take a look at the ds.rc script in the sample directory.

chulett · Post by **chulett** » Sun Dec 21, 2008 10:55 pm

vintipa wrote:actually i have no idea of the commands like ipcs -mop and ipcrm -m <shmid>. yet to explore these commands.

And yet you have the root password? Oy.