---------------------------------------------------------------
Env:
Blade host ---------> 2 B40 FC-SAN
---------->2 DS8100 IBM Storage
with redundancy with more than 4 multipaths
------------------------------------------------- -------------

multipath -ll

--fc3c3(DS8100 B)

n1ds1b03 (3600507630affc3c30000000000001b03) dm-3 IBM,2107900
[size=250G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=4][active]
\_ 1:0:0:28 sdad 65:208 [active][ready]
\_ 2:0:0:28 sddh 70:240 [active][ready]
\_ 2:0:1:28 sdgp 132:80 [active][ready]
\_ 1:0:2:28 sdgq 132:96 [active][ready]

1 0 0 28
2 0 0 28
2 0 1 28
1 0 2 28

Host:Bust:Target:Lun

第一位是主机的SCSI ID(HBA)，第二位是Channel ID(BUS)，第三位是Target ID(fc3c3/1)，第四位是LUN ID。
从同一个光纤卡识别的同一个存储设备的不同的卷，只有LUN ID不同.

multipath -ll|grep -E "1:0:0|2:0:0|2:0:1|1:0:2"|awk -F ":" '{print $4}'|awk '{print $1}'|sort -nu --0-43

--fc3c1(DS8100 A)

ds3203 (3600507630affc3c10000000000003203) dm-94 IBM,2107900
[size=250G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=4][active]
\_ 1:0:1:50 sdej 128:176 [active][ready]
\_ 1:0:3:50 sdlr 68:400 [active][ready]
\_ 2:0:2:50 sdls 68:416 [active][ready]
\_ 2:0:3:50 sdnt 71:496 [active][ready]

multipath -ll|grep -E "1:0:1|1:0:3|2:0:2|2:0:3"|awk -F ":" '{print $4}'|awk '{print $1}'|sort -nu --0-51

more /proc/scsi/scsi

--add lun from fc3c3(DS8100 B) --max lun 43

echo scsi add-single-device 1 0 0 44 > /proc/scsi/scsi
echo scsi add-single-device 2 0 0 44 > /proc/scsi/scsi
echo scsi add-single-device 2 0 1 44 > /proc/scsi/scsi
echo scsi add-single-device 1 0 2 44 > /proc/scsi/scsi

echo scsi add-single-device 1 0 1 52 > /proc/scsi/scsi
echo scsi add-single-device 2 0 1 52 > /proc/scsi/scsi
echo scsi add-single-device 1 0 2 52 > /proc/scsi/scsi
echo scsi add-single-device 2 0 2 52 > /proc/scsi/scsi

--Get FC-HBA card
lspci|grep -i fibre
systool -c fc_host -v --local
systool -c fc_remote_ports -v --remote port number

--Get Lun WWID(WWN)
scsi_id -g -u -s /block/sdX

ls -lth /dev/disk/by-id       --Identify of device via udev does not change with reboot and is unique to the device
ls -lth /dev/disk/by-path     --Shows the storage WWID if exists
ls -lth /dev/disk/by-uuid     --UUID is a unique device identifier assigned to each lun and device as unique generated by Linux

ls -lth /sys/block/sd[a-z]/device

cat /proc/scsi/scsi

[root@gtdb-r2 2:0:0:1]# ls -lth /sys/class/scsi_device/
total 0
drwxr-xr-x 2 root root 0 Sep 27 11:17 0:0:0:0
drwxr-xr-x 2 root root 0 Sep 27 11:17 0:0:1:0
drwxr-xr-x 2 root root 0 Sep 27 11:17 0:1:0:0
drwxr-xr-x 2 root root 0 Sep 27 11:17 2:0:0:0
drwxr-xr-x 2 root root 0 Sep 27 11:17 2:0:0:1
drwxr-xr-x 2 root root 0 Sep 27 11:17 2:0:0:2
drwxr-xr-x 2 root root 0 Sep 27 11:17 2:0:0:3
drwxr-xr-x 2 root root 0 Sep 27 11:17 2:0:0:4
drwxr-xr-x 2 root root 0 Sep 27 11:17 2:0:0:5

ls -lth /sys/class/scsi_disk/
ls -lth /sys/class/scsi_generic

ITPub博客

Linux Get Lun & HBA & Multipath info

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