IBM TotalStorage DS300, Best Practices Manual, Page: 446 / 680

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IBM TotalStorage DS300 and DS400 Best Practices Guide
20003390012f2c829
[size=97 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 2:0:2:0 sdb 8:16 [failed]
\_ round-robin 0 [active][best]
\_ 2:1:2:0 sdc 8:32 [active]
danube:~ #
After the failed connection from eth0 to the switch comes up again, the available
path is recognized by multipathd.
Example 7-15 /var/log/messages as eth0 comes up again
Aug 3 13:30:31 danube kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex.
[...]
Aug 3 13:31:12 danube kernel: iSCSI: bus 0 target 2 trying to establish session to portal 0,
address 192.168.1.61 port 3260 group 1
Aug 3 13:31:12 danube kernel: iSCSI: bus 0 target 2 established session #2 to portal 0,
address 192.168.1.61 port 3260 group1, alias danube-disk1
Aug 3 13:31:16 danube kernel: iSCSI: session iscsi_bus 0 target id 2 recv_cmd cdb 0x28, status
0x2, response 0x0, senselen 18, key 06, ASC/ASCQ 29/01, itt 3761 to (2 0 2 0), danube-disk1
Aug 3 13:31:16 danube kernel: iSCSI: Sense 70000600 0000000a 00000000 29010000 0000
Aug 3 13:31:16 danube kernel: iSCSI: session iscsi bus 0 recv_cmd itt 3761, to (2 0 2 0), cdb
0x28, U underflow, received 0, residual 512, expected 512
Aug 3 13:31:16 danube multipathd: 8:16: readsector0 checker reports path is up
Aug 3 13:31:16 danube multipathd: 8:16: reinstated
Aug 3 13:31:16 danube multipathd: devmap event (3) on 20003390012f2c829
The path via eth0 appears now as active (instead of failed) in the
multipath -l
output.
Example 7-16 multipath -l output after eth0 comes up again
danube:~ # multipath -l
20003390012f2c829
[size=97 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 2:0:2:0 sdb 8:16 [active]
\_ round-robin 0 [active][best]
\_ 2:1:2:0 sdc 8:32 [active]
danube:~ #