How to recover from readonly file system?

hi
we are using EBS R12 RUP 6.is it possible to recover one of our instance from read only file system partition?
scenario is :
Had a conference with customer and found the below :
Unable to start/run any "AD" scripts under $ADMIN_SCRIPTS_HOME". For example : Unable to start the concurrent manager using adcmctl.sh script. Below error can be seen :
Permission denied: Could write in "adcmctl.txt" : read only file system.
We have tried to change the permission but the same "read only file system was coming". To confirm the issue we tried to create a directory or file using "mkdir" and "touch" command respectively but got the same error. Customer has confirmed that it was 15 days back they found it working after that its not working.
Explained to customer that the issue is not with EBS but with some other operating system related. Please check with your OS administrator and make sure that this read only file system error will not come.
Action Plan
================
1.) Check with your OS administrator and resolve the "Read only file system error". It is a OS permission error. Update the SR once it got resolved.rgrds

new2appsdba wrote:
what do you suggest certain and immediate disaster recovery option (till date work and setup + data) in EBS R12 ??
bsically asking it for future planing ....Working, well-tested, and frequently-tested backups. :-)
Sorry to be glib, but there's a lot we don't know about the architecture of your system, which makes it difficult to provide specific advice. You haven't indicated how much of your system is hosted on the filesystem that has been set readonly. Is it just the INST_TOP? Full applications techstack? Database? I'm guessing not the database, or you wouldn't be asking about starting apps tier components, you'd be asking about database recovery, and the problem wouldn't have gone unnoticed for 15 days. If you're just looking at the apps tier filesystem, or a portion of it (such as INST_TOP, which is sometimes separated from the rest of the apps install), you need to decide if you want to:
1) Roll back your entire system to the point when the filesystem was set readonly, or
2) Accept the loss of log files, etc. on the apps tier side, decide that what's in the database is more valuable, and move on from there. Assuming the fsck and subsequent filesystem repair is successful, of course. ;-)
These posts from Steven Chan might help you to plan DR and availability for EBS:
Maximum Availability Architecture: Oracle E-Business Suite Release 12
Maximum Availability Architectures and the E-Business Suite
Regards,
John P.
http://only4left.jpiwowar.com

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