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Failure in S2600 results in the problem of multipathing come-go switch between hosts and storages

Publication Date:  2012-09-18 Views:  21 Downloads:  0
Issue Description
A S2600 was connected with a Solaris 10 in multipathing way. Under the condition that one of its controllers was broken, the storage in Solaris 10 was interrupted and it seems that the multipath did not work.
Alarm Information
None
Handling Process
Pull out the broken controller A from S2600, stop the function of controller completely and the data can be transferred from controller B only.
Root Cause
Check the system log with command line “demsg -c ”:
Oct 27 02:03:34 M2000-CBSC-3 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60022a110002b0994c28887e00000002 (ssd6) multipath status: degraded, path /pci@3,700000/SUNW,qlc@0/fp@0,0 (fp1) to target address: w22000022a102b099,2 is offline Load balancing: round-robin
Oct 27 02:03:34 M2000-CBSC-3 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60022a110002b0994c28886e00000001 (ssd7) multipath status: degraded, path /pci@3,700000/SUNW,qlc@0/fp@0,0 (fp1) to target address: w22000022a102b099,1 is offline Load balancing: round-robin
Oct 27 02:03:34 M2000-CBSC-3 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60022a110002b0994c28885d00000000 (ssd8) multipath status: degraded, path /pci@3,700000/SUNW,qlc@0/fp@0,0 (fp1) to target address: w22000022a102b099,0 is offline Load balancing: round-robin
Oct 27 02:04:35 M2000-CBSC-3 qlc: [ID 630585 kern.info] NOTICE: Qlogic qlc(2): Loop ONLINE
Oct 27 02:04:35 M2000-CBSC-3 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60022a110002b0994c28887e00000002 (ssd6) multipath status: optimal, path /pci@3,700000/SUNW,qlc@0/fp@0,0 (fp1) to target address: w22000022a102b099,2 is online Load balancing: round-robin
Oct 27 02:04:35 M2000-CBSC-3 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60022a110002b0994c28886e00000001 (ssd7) multipath status: optimal, path /pci@3,700000/SUNW,qlc@0/fp@0,0 (fp1) to target address: w22000022a102b099,1 is online Load balancing: round-robin
Oct 27 02:04:35 M2000-CBSC-3 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60022a110002b0994c28885d00000000 (ssd8) multipath status: optimal, path /pci@3,700000/SUNW,qlc@0/fp@0,0 (fp1) to target address: w22000022a102b099,0 is online Load balancing: round-robin
It was found that the storage link switch frequently which results in the IO failure that the data IO couldn’t been written into the disk.
Suggestions
For the broken controller, we can stop its service manually. 

END