What are those AIX fcstat error numbers all about?
cggibbo | 2016年11月17日 | 标签： fcstat errno gibson chris vios aix | 1 条评论 | 6,140 次访问
When troubleshooting Fibre Channel adapter issues on AIX (or VIOS), I often use the fcstat command to assist me in the process. The command may display error numbers similar to the following:
$ fcstat fcs0
Error opening device: /dev/fscsi0
errno: 00000045
The error number (errno) displayed can (in some cases) be used to identify the root cause of a problem. In the example above, the error number is 45. This number is in hex. If we convert this to decimal, the number is 69. Now, if we look for 69 in the /usr/include/errno.h file (on AIX), we discover that this error number relates to a “Network is down” event.
fcstat fcs0
Error opening device: /dev/fscsi0
errno: 00000045
echo “ibase=16; 45”|bc
69
grep 69 /usr/include/errno.h
#define ENETDOWN 69 /* Network is down */
The AIX error report (errpt or errlog on VIOS) also tells me that there’s some type of link error. This helps me focus my investigation toward the most likely problem area. In this case, I suspect either a physical link or cable problem between my FC adapter and the SAN switch.
IDENTIFIER TIMESTAMP T C RESOURCE_NAME DESCRIPTION
7BFEEA1F 1116121816 T H fcs0 LINK ERROR
errpt -aN fcs0 | grep -p Desc
…
Description
LINK ERROR
We can use the same process for other errors displayed by the fcstat command. For example:
fcstat fcs0
Error opening device: /dev/fscsi0
errno: 00000046
echo “ibase=16; 46”|bc
70
grep 70 /usr/include/errno.h
#define ENETUNREACH 70 /* Network is unreachable */
This particular error may direct us to the solution outlined in the following tech note:
Fibre channel workspace takes over 2 minutes to load but returns no data
http://www-01.ibm.com/support/docview.wss?uid=swg21600064
fcstat Command (AIX 6.1)
http://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.cmds2/fcstat.htm
fcstat Command (AIX 7.1)
http://www.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.cmds2/fcstat.htm
fcstat Command (AIX 7.2)
http://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.cmds2/fcstat.htm