Oracle Exalytics Software
 
Exalytics In-Memory Machine X2-4
 
Exalytics In-Memory Machine X3-4
 

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In this Document

Symptoms

Cause

Solution

References

Created from <SR 3-9152296341>

Applies to:

Symptoms

When using Exalytics, or Oracle Virtual Machine (OVM) on Oracle Exalytics, multiple errors related to the smartd device are reported in the logs:

Jun 12 00:15:38 EXALYTICS_OVS02 smartd[10687]: Device: /dev/sdd [SAT], 244302034763776 Offline uncorrectable sectors
Jun 12 00:15:38 EXALYTICS_OVS02 smartd[10687]: Device: /dev/sde [SAT], 223054831550464 Offline uncorrectable sectors
Jun 12 00:15:38 EXALYTICS_OVS02 smartd[10687]: Device: /dev/sdf [SAT], 197830488621056 Offline uncorrectable sectors
Jun 12 00:15:38 EXALYTICS_OVS02 smartd[10687]: Device: /dev/sdg [SAT], 269539262595072 Offline uncorrectable sectors
Jun 12 00:15:38 EXALYTICS_OVS02 smartd[10687]: Device: /dev/sdh [SAT], 244289149861888 Offline uncorrectable sectors (changed +4294967296)

This problem may occur on any Exalytics server that is running a version lower than Patchset 3, and may also occur in Patchset 5 (PS5).

The problem does not occur on Exalytics Patchset 4 environments.

Cause

This issue has been reported in the following bugs:

Internal, unpublished <Bug 17463303> SMARTD LOGS "OFFLINE UNCORRECTABLE SECTORS" FOR ALL FLASH MODULES IN EXALYTICS

<Bug 20836508> - EXALYTICS SMARTD LOGS "OFFLINE UNCORRECTABLE SECTORS" FOR ALL FLASH MODULES 

Servers with F40 Flash Accelerator cards installed may see smartd messages logged stating that "Offline uncorrectable sectors" are occurring.

This is due to a difference in the way that smartd parses the smart data provided by the F40 cards. Smartd is reading the bytes that LSI uses to represent the number of sectors read since power on as the value representing the uncorrectable sectors. Systems experiencing this issue will see messages similar to the following reported for each F40 module (24 drives) and it will repeat every 30 minutes:

Sep 18 09:54:00 exalytics0 smartd[11036]: Device: /dev/sdy, 104917461106688 Offline uncorrectable sectors
 

Solution

These messages are erroneous and may be ignored. The messages do not indicate any actual hardware failure and do not impact the systems stability, or performance.

- To disable the smartd daemon and prevent messages from being logged, use the following chkconfig commands.  These commands will turn smartd off and will confirm the settings. A reboot is required for this change to take affect.

NOTE: In Exalytics Patchset 4 (PS4), a fix was delivered to automatically disable the smartd daemon.  If you are using PS4, you will not see the messages and do not need to take any further action.  Due to regression bug, <Bug 20836508>, the same issue re-occurs in PS5.  A future Exalytics patch will disable smartd daemon automatically.  The regression bug was fixed in Exalytics Release 2.0.0.0.  By default, smartd daemon is turned off automatically in PS4 and release 2.0.0.0+.

References

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