action #105449
Updated by geor almost 3 years ago
## Motivation The FCP topology on our z/VM testing infrastructure has recently been updated and the [zfcp testsuite](https://openqa.suse.de/tests/latest?distri=sle&flavor=Online&test=zfcp&version=15-SP4) needs a new test module to validate multipathing. ## Task The idea is to check the status of the known infrastructure, and the status of multipathing on top of it. **AC1**: Verify that there are two host bus adapters attached, and that the corresponding channels (`0.0.fa00, 0.0.fc00`) are listed ``` # ls -l /sys/class/fc_host total 0 lrwxrwxrwx 1 root root 0 Dec 19 17:53 host0 -> ../../devices/css0/0.0.0005/0.0.fa00/host0/fc_host/host0 lrwxrwxrwx 1 root root 0 Dec 19 17:53 host1 -> ../../devices/css0/0.0.0006/0.0.fc00/host1/fc_host/host1 ``` **AC2**: Based on the output of lsscsi: ``` # lsscsi -xxgst [0:0:0:0x4001403200000000] disk fc:0x500507630703d3b30x760f00 /dev/sda /dev/sg0 214GB [0:0:0:0x4001405000000000] disk fc:0x500507630703d3b30x760f00 /dev/sdb /dev/sg1 42.9GB [0:0:1:0x4001403200000000] disk fc:0x500507630708d3b30x761000 /dev/sdc /dev/sg2 214GB [0:0:1:0x4001405000000000] disk fc:0x500507630708d3b30x761000 /dev/sdd /dev/sg3 42.9GB [1:0:0:0x4001403200000000] disk fc:0x500507630718d3b30x771000 /dev/sde /dev/sg4 214GB [1:0:0:0x4001405000000000] disk fc:0x500507630718d3b30x771000 /dev/sdf /dev/sg5 42.9GB [1:0:1:0x4001403200000000] disk fc:0x500507630713d3b30x770f00 /dev/sdg /dev/sg6 214GB [1:0:1:0x4001405000000000] disk fc:0x500507630713d3b30x770f00 /dev/sdh /dev/sg7 42.9GB ``` * verify that there are 8 SCSI block devices listed (as a result of having two adapters, two hard disks and two paths to each disk, 2^3 = 8) * verify that LUN `0x4001403200000000` corresponds to the 214GB disk, and LUN `0x4001405000000000` to the 42.9GB disk **AC3**: Based on the output of multipath -l: ``` # multipath -l 36005076307ffd3b30000000000000132 dm-0 IBM,2107900 size=200G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw `-+- policy='service-time 0' prio=0 status=enabled |- 0:0:0:1077035009 sda 8:0 active undef running |- 0:0:1:1077035009 sdc 8:32 active undef running |- 1:0:0:1077035009 sde 8:64 active undef running `- 1:0:1:1077035009 sdg 8:96 active undef running 36005076307ffd3b30000000000000150 dm-41 IBM,2107900 size=40G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw `-+- policy='service-time 0' prio=0 status=enabled |- 0:0:0:1079001089 sdb 8:16 active undef running |- 0:0:1:1079001089 sdd 8:48 active undef running |- 1:0:1:1079001089 sdh 8:112 active undef running `- 1:0:0:1079001089 sdf 8:80 active undef running ``` * verify that the multipath device with WWID `36005076307ffd3b30000000000000132` corresponds to the 200G disk and the multipath device with WWID `36005076307ffd3b30000000000000150` to the 40G disk. * verify that there are 4 block devices listed for each virtual multipath device * verify that there are four devices ## Suggestion It might help to check [this confluence article](https://confluence.suse.com/display/QYT/Mainframe+Musings%3A+Playing+around+with+FCP+and+multipath#MainframeMusings:PlayingaroundwithFCPandmultipath-Faulttoleranceinaction) for some more insight on the output of the above commands.