Ian,

Thanks for sharing (seriously).

Igor Neyman, OCP DBA
[EMAIL PROTECTED]



-----Original Message-----
MacGregor, Ian A.
Sent: Monday, September 15, 2003 11:34 PM
To: Multiple recipients of list ORACLE-L

Last Friday was hot here, and rumor has it our  230 KV  power line
sagged and touched some tree branches.  The local power company shut it
off.  Leaving our systems to depend on UPS.  About 30 minutes afterwards
one system produced these  errors.  This was jus before the system went
dead

Fri Sep 12 12:58:40 2003
Errors in file /opt/oracle/admin/BBRO/bdump/bbro_ckpt_1420.trc:
ORA-00206: error in writing (block 3, # blocks 1) of controlfile
ORA-00202: controlfile: '/u1/oradata/BBRO/BBROcntrl01.ctl'
ORA-27063: skgfospo: number of bytes read/written is incorrect
SVR4 Error: 5: I/O error
Additional information: -1
Additional information: 8192
Fri Sep 12 12:58:42 2003
Errors in file /opt/oracle/admin/BBRO/bdump/bbro_ckpt_1420.trc:
ORA-00221: error on write to controlfile
ORA-00206: error in writing (block 3, # blocks 1) of controlfile
ORA-00202: controlfile: '/u1/oradata/BBRO/BBROcntrl01.ctl'
ORA-27063: skgfospo: number of bytes read/written is incorrect
SVR4 Error: 5: I/O error
Additional information: -1
Additional information: 8192
Fri Sep 12 12:58:42 2003
CKPT: terminating instance due to error 221
Instance terminated by CKPT, pid = 1420
------------------------------------------------------------------------
-------------------------------------
Things look pretty shaky here.  When things were restarted the following
error was produced.
Fri Sep 12 13:32:01 2003
ORA-00204: error in reading (block 1, # blocks 1) of controlfile
ORA-00202: controlfile: '/u1/oradata/BBRO/BBROcntrl01.ctl'
ORA-27091: skgfqio: unable to queue I/O
SVR4 Error: 6: No such device or address
Additional information: 1

The raid array had not been powered on
------------------------------------------------------------------------
-------------------------------
However 
Fri Sep 12 15:33:08 2003
ORA-00202: controlfile: '/u1/oradata/BBRO/BBROcntrl01.ctl'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
Fri Sep 12 15:33:11 2003
ORA-205 signalled during: alter database  mount...

Now the file system is available, but the file itself has disappeared.
It was not corrupted, just disappeared.  We duplex a copy to an internal
disk.  So recovery was easy.

However once this was fixed

Fri Sep 12 16:18:58 2003
Thread recovery: start rolling forward thread 1
Fri Sep 12 16:18:58 2003
Errors in file /opt/oracle/admin/BBRO/udump/bbro_ora_1804.trc:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/u2/oradata/BBRO/redo0301.log'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-313 signalled during: ALTER DATABASE OPEN...
------------------------------------------------------------------------
-------------------------------------
These files are on a RAID  1 LUN.  Both copies of the file are gone.
Again not corrupted but gone.  I don't know if using duplexing rather
than RAID 1 would have mattered here, but I am changing things so that
one group of redo logs is on internal disk and written via the duplexing
method.




Ian MacGregor
Stanford linear Accelerator Center
[EMAIL PROTECTED]

 

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Author: Igor Neyman
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