3 Hardware Issues
This section describes important operating notes and known hardware issues for Oracle Server X8-2L.
- Diagnosing SAS Data Path Failures on Servers Using MegaRAID Disk Controllers
- Failure of a Single Server Fan Module Might Impact Performance
- Remove and Replace a Fan Module Within 60 Seconds
- Lockstep Memory (Channel) Mode Is Not Supported
- Do Not Mix Single-Rank and Dual-Rank DIMMs
- Oracle Dual Port 25 Gb Ethernet Adapter Can Experience a Fault During System Reset
Diagnosing SAS Data Path Failures on Servers Using MegaRAID Disk Controllers
Important Operating Note
On Oracle x86 servers using MegaRAID disk controllers, Serial Attached SCSI (SAS) data path errors can occur. To triage and isolate a data path problem on the SAS disk controller, disk backplane (DBP), SAS cable, SAS expander, or hard disk drive (HDD), gather and review the events in the disk controller event log. Classify and analyze all failure events reported by the disk controller based on the server SAS topology.
To classify a MegaRAID disk controller event:
-
Gather and parse the MegaRAID disk controller event logs either by running the automated sundiag utility or manually using the or
StorCLI
command.-
For Oracle Exadata Database Machine database or storage cell servers, run the sundiag utility.
-
For Oracle Server X8-2L, use the
StorCLI
command.
-
For example, manually gather and parse the controller event log by using the
StorCLI
command. At the root prompt, type:
root# ./storcli64/c0 show events file=event.log Controller=0 Status=Success
Note:
Use the existing name of the event log as the name for the disk controller event log. This produces a MegaRAID controller event log with the given file nameevent.log
.
To show drive and slot errors separately, at the root prompt, type:
root# /opt/MegaRAID/storcli/storcli64 /c0 /eall /sall show errorcounters Controller=0 Status=Success Description=Show Drive/Cable Error Counters Succeeded.
Error Counters:
Drive | Error Counter for Drive Error | Error Counter for Slot |
---|---|---|
/c0/e8/s0 |
0 |
0 |
/c0/e8/s1 |
0 |
0 |
/c0/e8/s2 |
0 |
0 |
/c0/e8/s3 |
0 |
0 |
/c0/e8/s4 |
0 |
0 |
/c0/e8/s5 |
0 |
0 |
/c0/e8/s12 |
0 |
0 |
/c0/e8/s13 |
0 |
0 |
These error counters reflect drive or slot errors separately.
The following SCSI sense key errors found in the event log in SAS data path failures indicate a SAS data path fault:
B/4B/05 :SERIOUS: DATA OFFSET ERROR B/4B/03 :SERIOUS: ACK/NAK TIMEOUT B/47/01 :SERIOUS: DATA PHASE CRC ERROR DETECTED B/4B/00 :SERIOUS: DATA PHASE ERROR
A communication fault between the disk and the host bus adapter causes these errors. The presence of these errors, even on a single disk, means there is a data path issue. The RAID controller, SAS cables, SAS expander, or disk backplane might be causing the interruption to the communication in the path between the RAID controller and the disks.
Oracle Service personnel can find more information about the diagnosis and triage of hard disk and SAS data path failures on x86 servers at the My Oracle Support web site: https://support.oracle.com . Refer to the Knowledge Article Doc ID 2161195.1. If there are multiple, simultaneous disk problems on an Exadata server, Oracle Service personnel can refer to Knowledge Article Doc ID 1370640.1.
Parent topic: Hardware Issues
Failure of a Single Server Fan Module Might Impact Performance
Important Operating Note
If a single server fan module fails and the server's operating temperature rises above 30 degrees C (86 degrees F), the performance of the server's processors might be reduced.
Parent topic: Hardware Issues
Remove and Replace a Fan Module Within 60 Seconds
Important Operating Note
When removing and replacing a server fan module, you must complete the entire removal and replacement procedure within 60 seconds in order to maintain adequate cooling within the system. In anticipation of this time limit, prior to starting the replacement procedure, obtain the replacement fan module and verify that the new fan module is ready for installation. Remove and replace only one fan module at a time.
Fan modules are hot-swappable components, with N+1 fan redundancy. Each fan module contains two fans, with one fan motor per fan. The two fan motors provide separate tachometer signals so that the fan module reports two tachometer signals to Oracle ILOM. Even if only one fan motor is faulted within the fan module, the Oracle ILOM service processor detects that two fan motors have failed to spin while the fan module is removed. If the fan module is not replaced within 60 seconds of removal, Oracle ILOM will take the protective action to shut down the system to prevent thermal damage to the system. This is expected behavior.
Parent topic: Hardware Issues
Lockstep Memory (Channel) Mode Is Not Supported
Important Operating Note
Oracle Server X8-2L does not support lockstep memory mode, which is also known as double device data correction, or Extended ECC.
Parent topic: Hardware Issues
Do Not Mix Single-Rank and Dual-Rank DIMMs
Important Operating Note
Mixing of single-rank and dual-rank DIMMs in Oracle Server X8-2L is not supported.
Parent topic: Hardware Issues
Oracle Dual Port 25 Gb Ethernet Adapter Can Experience a Fault During System Reset
Bug ID: 26259122
Issue: The Oracle Dual Port 25 Gb Ethernet Adapter can experience a completion timeout fault during a system warm reset operation. The fault is logged by Oracle ILOM.
Affected Hardware: Oracle Dual Port 25 Gb Ethernet Adapter
Workaround: This issue has no functional impact on normal system behavior and can be ignored.
Parent topic: Hardware Issues