online error

Hi, Our informix online (version 5.03) crashed with the following online.log output. The uid, 550, was user informix. I can't track down the pid at this point. After consulting the administrators guide, I re-initialized the shared memory and then brought the system back on line. I am not clear on WHY this error occured, though, and would like to track it down as we have a real-time system that relies on the database. Also, recently the permissions had been changed on the link to the raw device that is our primary chunk. We just changed the permissions and the system appeared to come up cleanly. FWIW. We have recently upgraded our operating system on the database machine to HP-UX A.09.05 A and are running on a 9000/715. It seems that the problems may be related, but wanted to get some input on possible causes before I start procedures to upgrade informix or back out the OS upgrade. ------------------------------------------------------------- 17:41:52 INFORMIX-OnLine Must ABORT Log Error 'logput() - logwrite() FAILED' us 0x80a8b124 pid 6940 us_flags 0x201 tx 0x80a8ba34 tx_flags 0x80001 tx_loguniq 48 tx_logpos 0xac018 17:41:52 -- Online Aborting -- us=80a8b124, pid=6940, uid=550 17:41:53 I/O write() chunk 1, pagenum 7, pagecnt 1 --> errno = 4 17:41:53 INFORMIX-OnLine Must ABORT Root chunk down. 17:41:53 -- Online Aborting -- us=80a8b124, pid=6940, uid=550 17:41:53 Checkpoint Page Write Error 17:41:53 I/O write() chunk 1, pagenum 9, pagecnt 1 --> errno = 4 17:41:53 INFORMIX-OnLine Must ABORT Root chunk down. 17:41:53 -- Online Aborting -- us=80a8b124, pid=6940, uid=550 17:41:53 Checkpoint Page Write Error 17:41:53 I/O write() chunk 1, pagenum 3, pagecnt 1 --> errno = 4 17:41:53 INFORMIX-OnLine Must ABORT Root chunk down. 17:41:53 -- Online Aborting -- us=80a8b124, pid=6940, uid=550 17:41:53 Checkpoint Page Write Error 17:41:53 INFORMIX-OnLine entering ABORT mode!!! 17:41:53 -- Online Aborting -- us=80a8b124, pid=6940, uid=550 17:41:55 INFORMIX-OnLine Stopped ------------------------------------------------------------- Our news machine is VERY flaky, so please email any thoughts you might have, or I may not be able to benefit from them. Thanks in Advance Carol *************************************************************** Carol L. Stimmel NOAA/ERL/FSL Systems Analyst stimmel@fsl.noaa.gov ***************************************************************