DataDirect Networks S2A9550, User Manual

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Trouble Shooting
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DataDirect Networks S2A 9550 User Guide
If your enclosures provide redundant SES communication paths, the message will be reported
twice. “EncID” is the World Wide Name of the enclosure that reported the failure. The last four
digits of the WWN is the last four digits of the enclosure’s serial number.
To display the current drive enclosure failures, type in command
SES
(Figure 4-76)
.
4.1.4 Error Correction (Bad Block Management)
The S2A attempts to correct errors as they occur on the system. One of the primary reasons for
these errors is the occurence of disk errors that can be attributed to bad sectors on the disk.
These bad sectors ususally manifest themselves in a few ways:
• a check condition whenever a read occurs
• a check condition whenever a write occurs
• bus parity errors encountered while running rebuilds.
When activated, Error Correction runs continuously in the background. Once activated, it first
attempts to perform a DMA (disk management applcation) write and a DMA read from the disk
drive. If there is a failure, it located the bad sectors and attempts to reassign them. After the
reassign, the cache node is rebuilt and verified. While the rebuild progresses, the Bus Parity
Error Correction process runs in the background awaiting bus parity error should any occur
duing the rebuild. If activated, the Bus Pairty Error Correction will attempt to rebuild the sector
again.
ses_E 12:55:58 EncID:50050CC0000033BB: Device 3 SLOT ADDR D5: NOT INSTALLED
Figure 4-75 Example of SES Messages
ses_fault 12:42:57 Disk missing 1B
ses_A 13:45:23 EncID:50050CC0000033C8: Power Supply 1 :DC Power Failure
EncID:50050CC0000033C8: Power Supply 1 :DC Power Failure
Figure 4-76 Displaying the Current Disk Enclosure Failures
S2A [1]: ses