Fibre Channel作为一种专用、高速网络，和iSCSI相比，提供了更高的数据传输带宽、速度和可靠性。熟练掌握一些常用Fibre channel的一些命令，可以方便我们进行原型验证、调试和开发。下面总结了笔者常用到的一些命令，就当抛砖迎玉吧。
A. FC 发起端
1. 看主机FC HBA wwpn:
cat /sys/class/fc_host/host*/port_name | sed -e s/0x// -e ‘s/../&:/g‘ -e s/:$//
2. 看对端机器FC相关设置
看wwpn:
[[email protected] rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/port_name
0x21000024ff684921
[[email protected] rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/scsi_target_id
-1
看角色：
[[email protected] rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/roles
FCP Initiator
看24位的port ID:
[[email protected] rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/port_id
0x0000e8
看发起端的IO超时设置：
[[email protected] rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/dev_loss_tmo
30
[[email protected] rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/fast_io_fail_tmo
off
3. rescan devices after FC fail-over:
[[email protected] var]# cd /sys/class/scsi_host/
[[email protected] scsi_host]# for i in `ls `; do echo "- - -" > $i/scan ; done
[[email protected] scsi_host]# lsscsi -si
[0:0:0:10] disk Leadstor swtich_vol 1.0 /dev/sdc 360014055e652dee8e232d50cbd3665c2 1.07GB
[0:0:0:20] disk Leadstor fc_failover 1.0 /dev/sdd 36001405d3b6e11ace2a8f7f6b00ba7cc 2.19TB
[1:0:0:0] disk ATA SanDisk SD7SB6S1 X355 /dev/sda SanDisk_SD7SB6S128G1001_162609801097 128GB
[2:0:0:0] disk ATA ST2000DM001-1ER1 CC62 /dev/sdb - 2.00TB
[7:0:0:3] disk Leadstor fc_vol 1.0 /dev/sde 36001405c410df1475de9e08ab3f8b9ef 1.07GB
[7:0:0:4] disk Leadstor fc_all_vol 1.0 /dev/sdf 36001405f4807a693420c2c7b98ad996b 1.07GB
[7:0:0:15] disk Leadstor fc_0801vol2 1.0 /dev/sdg 3600140546e63e0728bb357aad6a3d91a 2.14GB
[7:0:0:20] disk Leadstor fc_failover 1.0 /dev/sdh 36001405d3b6e11ace2a8f7f6b00ba7cc 2.19TB
4. 如何发起枚举FC target上的盘
在initiator 上运行下面的命令：
## step 1: extend the time-out setting for initiator
for i in `ls /sys/class/fc_host`
do
echo "Extend time out for $i"
echo 90 > /sys/class/fc_host/$i/dev_loss_tmo
done
## step 2: Trigger to discorvery and login to target
for i in `ls /sys/class/fc_host`
do
echo "Trigger $i to discovery target"
echo 1 > /sys/class/fc_host/$i/issue_lip
done
B. FC Target端
1. 看target 相关设置
[[email protected] qla2xxx]# pwd
/sys/kernel/config/target/qla2xxx
[[email protected] qla2xxx]# cat 21\:00\:00\:0e\:1e\:c2\:3e\:a0/
fabric_statistics/ tpgt_1/
[[email protected] qla2xxx]# cat 21\:00\:00\:0e\:1e\:c2\:3e\:a0/fabric_statistics/
cat: 21:00:00:0e:1e:c2:3e:a0/fabric_statistics/: Is a directory
[[email protected] qla2xxx]# cat 21\:00\:00\:0e\:1e\:c2\:3e\:a0/tpgt_1/
acls/ attrib/ auth/ enable lun/ np/ param/
[[email protected] qla2xxx]# cat 21\:00\:00\:0e\:1e\:c2\:3e\:a0/tpgt_1/enable
1
2. 解决target端默认不是target 模式的问题
基于qlogic HBA 卡，CentOS中当期默认按照initiator模式加载驱动。但在存储服务器端，它必须每次都以target模式加载。 为此需要做下面的修改：
edit : /etc/grub2.cfg
linux16 /vmlinuz-3.10.0-229.el7.x86_64+ root=/dev/mapper/centos-root ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet LANG=en_US.UTF-8 systemd.debug qla2xxx.qlini_mode="disabled"
然后运行grub2-mkconfig，最后重启机器后默认就按照target模式加载qla2xxx驱动。