RAC-DATA FILE ACCESSING ISSUE FROM ONE NODE

Dear All,
We have a two node RAC (10.2.0.3)running on Hp Unix. From yesterday onwards, from one instance accessing data from a specific data file showing the below error, whereas accessing from other node to the same datafile is working properly.
Errors in file /oracle/product/admin/tap3plus/bdump/tap3plus4_dbw0_24950.trc:
ORA-01157: cannot identify/lock data file 75 - see DBWR trace file
ORA-01110: data file 75: '/dev/vg_rac/rraw_tap3plus_temp_live05'
ORA-27041: unable to open file
HPUX-ia64 Error: 19: No such device
Additional information: 2
Tue Jan 31 08:52:09 2012
Errors in file /oracle/product/admin/tap3plus/bdump/tap3plus4_dbw0_24950.trc:
ORA-01186: file 75 failed verification tests
ORA-01157: cannot identify/lock data file 75 - see DBWR trace file
ORA-01110: data file 75: '/dev/vg_rac/rraw_tap3plus_temp_live05'
Tue Jan 31 08:52:09 2012
File 75 not verified due to error ORA-01157
Tue Jan 31 08:52:09 2012
Thanks in Advance

user585870 wrote:
We have a two node RAC (10.2.0.3)running on Hp Unix. From yesterday onwards, from one instance accessing data from a specific data file showing the below error, whereas accessing from other node to the same datafile is working properly.That would be due to some kind of failure in the shared storage layer.
RAC needs the very same storage layer to be visible and available on each RAC node - thus this needs to be some form of shared cluster storage.
Should a piece of it fails on one node, that node would not be able to access the RAC database files on that shared storage layer - and will throw the type of errors you are seeing.
So how does this shared storage layer look like? Fibre channels (HBAs) connected to a Fibre Channel Switch and SAN - making SAN LUNs available as shared storage devices?
Typically a shared storage failure would throw errors in the kernel log. This is because the error is not an Oracle error, but a kernel error. As it is in your case. The bottom error on the error stack points to the root cause:
ORA-01157: cannot identify/lock data file 75 - see DBWR trace file
ORA-01110: data file 75: '/dev/vg_rac/rraw_tap3plus_temp_live05'
ORA-27041: unable to open file
HPUX-ia64 Error: 19: No such device
So HP-UX on that node is not seeing a specific shared storage device.

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