IMS u0271 abend while purging buffers during a checkpoint

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

hello,

when i try to restart the job i got U0271 abend..it shows An I/O error was detected while purging buffers during a checkpoint operation

please let me know how to solve the problem

thanks in advance

enrico-sorichetti · Posted: Mon Oct 29, 2007 5:38 pm

What does the IMS manual say ?
( rethoric question, I looked it up for You )

Bitneuker · Posted: Mon Oct 29, 2007 6:34 pm

Was the GSAM file pre-allocated and opened/closed to set an EOF mark? What about the DCB?

An allocated GSAM dataset which hasn't had OPEN or ISRT calls issued has
undefined content. BSAM processing may churn through whatever blocks were on those disk tracks, eventually finding an EOF mark in a random location.
QSAM would probably fail with an error due to blocksize, recfm and lrecl
mismatch on the first block.

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

hello ,

let i tell u ..wat i have done..i just run the job with normal checkpoin (for normal run).. the job runs successfully..again for set the checkpoint with abend checkpoin the program abended .after that i restart the job with restart checkpoint i got this (u0271) abend..

please let me know whether this is ims database error or file error..
how can i solve ?
regrds
ravindran.d

Bitneuker · Posted: Wed Oct 31, 2007 4:35 pm

Again; reconstruct the GSAM file and make sure there's an EOF mark issuing an open/close.

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

hi Bitneuker ,
Thanks. I solved this abend.

regards
Ravindran.d

Bitneuker · Posted: Wed Oct 31, 2007 5:49 pm

Could you also tell us how?

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

hi,

In my job first step i am creating the files.when i run the job the job was abended and it writes some records in that files.Again when i restart the job i have to comment the first step. But without comment the first step i restarted the job.so I got u0271 abend. because I/O problem so i comment the step and restart the job it run successfully.

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

hi,
Please,let me know any queries?

Bitneuker · Posted: Wed Oct 31, 2007 6:21 pm

I understand that, after the abend, you allocated the GSAM-file in the first step (emptying the filled one) and in the next step performed a restart on this new allocated empty GSAM-file. Is this correct? If so it explains the failure; checkpoint for restart can't be found.

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

No need create the file after the job abend.the same file is using for restart because the job should writes the record in the same file(append).

Bitneuker · Posted: Wed Oct 31, 2007 7:01 pm

Might be but when you reconstructed the file in the first step after the abend it was empty (not initialized so no EOF-mark). That's what I tried to tell you earlier.

ravindran.d · New User Joined: 04 Apr 2007 Posts: 26 Location: chennai

Bitneuker,

Thanks for ur valid information.
regards
ravindran.d

krishna_mf · New User Joined: 31 Jan 2007 Posts: 56 Location: banglore

Hi,
I am also facing the same probelm while restart.
But in my case. job abended due to region came down with last CKPTID=00000720. and then i restarted the job and it took restarted from previous checkpoint (from CKPTID=00000720) but failed With U0271 after taking few checkpoints till 00000726.
Please help me how to proceed and resolve this issue.

Thanks
krishna