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en:services:storage_services:backup:tsm:admin:fc_stuff [2019/04/03 15:20] – bnachtwen:services:storage_services:backup:tsm:admin:fc_stuff [2023/02/03 08:46] – [SLES] bnachtw
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 +====== some useful commands around fibre channel ======
 +===== WWN & Co =====
 +==== get the wwn from the adapers ====
  
 +=== using systool ===
 +according to [[https://www.thegeekdiary.com/how-to-identify-the-hba-cardsports-and-wwn-in-rheloel/| The Geek Diary]]
 +  * To check the available HBA ports :
 +<code>
 +# systool -c fc_host
 +Class = "fc_host"
 +
 +  Class Device = "host2"
 +    Device = "host2"
 +
 +  Class Device = "host3"
 +    Device = "host3"
 +</code>
 +
 +  * To find the WWNs for the HBA ports :
 +<code>
 +# systool -c fc_host -v | grep port_name
 +    port_name           = "0x500143802426baf4"
 +    port_name           = "0x500143802426baf6"
 +</code>
 +  * To check the state of the HBA ports (online/offline) :
 +<code>
 +# systool -c fc_host -v | grep port_state
 +    port_state          = "Online"
 +    port_state          = "Online"
 +</code>
 +===== multipathing =====
 +==== paths & devices ====
 +==== multipathd commands ====
 +multipathd is not only the the multipath daemon itself, but also a useful command for analysing the SAN:
 +<code>
 +# multipathd --help
 +</code>
 +FIXME
 +
 +===== Rescaning the SCSI bus =====
 +ordinarily you just use the ''rescan-scsi.sh'' command.
 +thus, this only reads the configuration again, but does not reinitialize the HBA.
 +
 +this can be done by:
 +<code>
 +# echo "1" > /sys/class/fc_host/host<X>/issue_lip
 +</code>
 +replacing '<X'>  with the number of the HBA.
 +
 +==== manual switch off/on of HBA ====
 +thanks to [[https://www.veritas.com/support/en_US/article.100050716|Veritas]]
 +
 +* To list available HBA ports, type:
 +<code>
 +# ls -l /sys/class/fc_host
 +total 0
 +lrwxrwxrwx. 1 root root 0 Jun 24 13:52 host28 -> ../../devices/pci0000:80/0000:80:02.0/0000:81:00.0/host28/fc_host/host28
 +lrwxrwxrwx. 1 root root 0 Jun 24 14:15 host29 -> ../../devices/pci0000:80/0000:80:02.0/0000:81:00.1/host29/fc_host/host29
 +</code>
 + 
 +The ''lspci'' command can be used to display the available Fibre Channel  (FC) Adapters:
 +
 +<code>
 +# lspci | grep Fibre
 +81:00.0 Fibre Channel: QLogic Corp. ISP8324-based 16Gb Fibre Channel to PCI Express Adapter (rev 02)
 +81:00.1 Fibre Channel: QLogic Corp. ISP8324-based 16Gb Fibre Channel to PCI Express Adapter (rev 02)
 +</code>
 +
 +The Fibre Channel (FC) HBA port access on RedHat can be temporarily disabled using the unbind string against the pci-device-id bus address.
 + 
 +Syntax:
 +
 +<code>
 +# echo "PCI-DEVICE-ID" > /sys/bus/pci/drivers/qla2xxx/unbind
 +</code> 
 +
 +To disconnect access for a specific PCI device (81:00:0), the sample syntax would be as follows:
 +
 +<code>
 +# echo "0000:81:00.0" > /sys/bus/pci/drivers/qla2xxx/unbind
 +</code>
 +
 +To display the filename & associated WWN details for all FC HBA controllers:
 +<code>
 +# awk '{print substr(FILENAME, $0)" \"" $0"\" "}'   /sys/class/fc_host/host*/port_name
 +/sys/class/fc_host/host28/port_name "0x2001000e1ec2f9ca"
 +/sys/class/fc_host/host29/port_name "0x2001000e1ec2f9cb"
 +</code>
 +
 +To display the filename & HBA port status:
 +<code>
 +# awk '{print substr(FILENAME, $0)" \"" $0"\" "}'   /sys/class/fc_host/host*/port_state
 +/sys/class/fc_host/host28/port_state "Online"
 +/sys/class/fc_host/host29/port_state "Online"
 +</code>