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WWN FC 光纖通道的定址

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    WWN 為World Wide Name 縮寫
    如同網卡有 MAC Address(48bits) 作為辨識方式.光纖也是有類似的定址 WWN,World Wide Name:FC 光纖通道的定址 (64 bits),這個光纖通道的 WWN 也像是 MAC 一樣每一個出貨的 HBA(Host Bus Adapter) 都有他獨一無二的 WWN .屬於硬體的一部份.  如果要更改WWN,必需準備其專用燒錄程式

    WWN 還細分了 WWNN:World Wide Node Name / WWPN:World Wide Port Name 使用上有點不同.

    1. WWNN 以FC 控制器上ASIC (不是調變IC )為依歸,如果卡上控制器為 1個,那WWNN 只會有一個.
        現行Qlogic FC  1,2,4 port 為單ASIC 控制器為主. 就為一個WWNN
                   
    2.
    當你的光纖 HBA 每個 port 對應一個 WWPN
              FC  Dual  Port . 2個WWNN
                     Quad Port . 4個WWNN


    3.通常會在 Fiber switch 上使用到 cone ,trunk 等功能時 會看到針對 WWPN WWNN 來設定.

    參考
    http://space.doit.com.cn/35700/viewspace-4367.html

    Linux 下要看 WWNN / WWPN 可以查看檔案  /proc/scsi/qla2xxx/ (thx  補:這應該是限定QLogic Card看法)
     

    [[email protected] ~]# ls -l /proc/scsi/qla2xxx/
    total 0
    -rw-r--r-- 1 root root 0 Mar 11 19:04 4
    -rw-r--r-- 1 root root 0 Mar 11 19:04 5

    [[email protected] ~]# cat /proc/scsi/qla2xxx/4
    QLogic PCI to Fibre Channel Host Adapter for xxxxxxxx:
            Firmware version 4.04.00 [IP] [84XX] , Driver version 8.02.14.01-fo
    BIOS version 0.00
    FCODE version 0.00
    EFI version 0.00
    Flash FW version 0.00.00 0000
    ISP: ISP6432
    Request Queue = 0x179500000, Response Queue = 0x17a800000
    Request Queue count = 4096, Response Queue count = 512
    Total number of active commands = 0
    Total number of interrupts = 4002
        Device queue depth = 0x20
    Number of free request entries = 3596
    Number of mailbox timeouts = 0
    Number of ISP aborts = 0
    Number of loop resyncs = 0
    Number of retries for empty slots = 0
    Number of reqs in pending_q= 0, retry_q= 0, done_q= 0, scsi_retry_q= 0
    Number of reqs in failover_q= 0
    Host adapter:loop state = <READY>, flags = 0x5a13
    Dpc flags = 0x4080000
    MBX flags = 0x0
    Link down Timeout = 030
    Port down retry = 030
    Login retry count = 030
    Commands retried with dropped frame(s) = 0
    Product ID = 0000 0000 0000 0000

    SCSI Device Information:
    scsi-qla0-adapter-node=9005962432112233;
    #就是 WWNN
    scsi-qla0-adapter-port=9005962432112233;

    #就是 WWPN
    scsi-qla0-target-0=2200000c50c22881;
    scsi-qla0-target-1=2200000c50c237f6;
    scsi-qla0-target-2=2200000c50c22acf;
    scsi-qla0-target-3=2200000c50c22d14;
    scsi-qla0-target-4=2200000c50c23157;

    FC Port Information:
    scsi-qla0-port-0=2000000c50c22881:2200000c50c22881:0000e0:0;
    scsi-qla0-port-1=2000000c50c237f6:2200000c50c237f6:0000dc:1;
    scsi-qla0-port-2=2000000c50c22acf:2200000c50c22acf:0000da:2;
    scsi-qla0-port-3=2000000c50c22d14:2200000c50c22d14:0000d9:3;
    scsi-qla0-port-4=2000000c50c23157:2200000c50c23157:0000d6:4;

    SCSI LUN Information:
    (Id:Lun)  * - indicates lun is not registered with the OS.
    ( 0: 0): Total reqs 84, Pending reqs 0, flags 0x2, Dflags 0x0, 0:0:00 00
    ( 1: 0): Total reqs 82, Pending reqs 0, flags 0x2, Dflags 0x0, 0:0:01 00
    ( 2: 0): Total reqs 84, Pending reqs 0, flags 0x2, Dflags 0x0, 0:0:02 00
    ( 3: 0): Total reqs 84, Pending reqs 0, flags 0x2, Dflags 0x0, 0:0:03 00
    ( 4: 0): Total reqs 84, Pending reqs 0, flags 0x2, Dflags 0x0, 0:0:04 00

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