In my central syslog I can see a some instances ofo the following error from LSI's RDAC multi-pathing driver for Linux.
[RAIDarray.mpp]MY_NICE_STORAGE_ARRAY:1:0:7 Cmnd-failed try alt ctrl 0. vcmnd SN 2436 pdev H1:C0:T0:L7 0x05/0x94/0x01 0x08000002 mpp_status:1
also some instances of
[RAIDarray.mpp]MY_NICE_STORAGE_ARRAY:1:0:10 Illegal Request ASC/ASCQ 0x20/0x0, SKSBs 0x0/0x0/0x0
[RAIDarray.mpp]MY_NICE_STORAGE_ARRAY:1:0:10 IO FAILURE. vcmnd SN 887 pdev H2:C0:T0:L10 0x05/0x20/0x00 0x08000002 mpp_status:1
I get it from nearly all of my machines in the SAN during the day, but not all of them at once - usually one of them in 5 hours. All FC switches and all FC HBAs show no errors from today and all paths to any LUN are up when i check them. Performance (IOPS and sequential access) is also very fine. Anyone seen this?