从同一台阵列映射4个LUN，FC组网，并配置为MPIO设备，查看4个磁盘的属性，发现每个盘的scsi_id、ww_name、node_name分别都是相等的，只有lun_id不一样。如下所示：
-bash-3.00# lsattr -El updisk0
PCM PCM/friend/UPpcm Path Control Module False
PR_key_value none Persistant Reserve Key Value True
algorithm fail_over Algorithm True
clr_q no Device CLEARS its Queue on error True
device_mode 0 Reserve Policy True
dist_err_pcnt 0 Distributed Error Percentage True
dist_tw_width 50 Distributed Error Sample Time True
dvc_support Device Support False
hcheck_cmd test_unit_rdy Health Check Command True
hcheck_interval 30 Health Check Interval True
hcheck_mode nonactive Health Check Mode True
location Location Label True
lun_id 0x0 Logical Unit Number ID False
lun_reset_spt yes LUN Level Reset True
max_transfer 0x40000 Maximum TRANSFER Size True
node_name 0x2100001882552bcf FC Node Name False
pvid 0001f090e6d9977f0000000000000000 Physical volume identifier False
q_err yes Use QERR bit True
q_type simple Queuing TYPE True
queue_depth 5 Queue DEPTH True
reassign_to 120 REASSIGN time out value True
reserve_policy no_reserve Reserve Policy True
rw_timeout 30 READ/WRITE time out value True
scsi_id 0x202e0 SCSI ID False
start_timeout 60 START unit time out value True
ww_name 0x2208001882552bcf FC World Wide Name False
问题：scsi_id、ww_name、node_name分别代表什么含义？为什么4个盘的这3个属性会相等？
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