实战Fibre Channel之六: 发起端和目的端常用命令

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:

[root@localhost rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/port_name

0x21000024ff684921

[root@localhost rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/scsi_target_id

-1

看角色：

[root@localhost rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/roles

FCP Initiator

看24位的port ID:

[root@localhost 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：

[root@localhost rport-12:0-0]# cat /sys/class/fc_remote_ports/rport-12\:0-0/dev_loss_tmo

30

[root@localhost 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:

[root@localhost var]# cd /sys/class/scsi_host/

[root@localhost scsi_host]# for i in `ls `; do echo "- - -" > $i/scan ; done

[root@localhost 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

[root@localhost qla2xxx]# pwd

/sys/kernel/config/target/qla2xxx

[root@localhost qla2xxx]# cat 21\:00\:00\:0e\:1e\:c2\:3e\:a0/

fabric_statistics/ tpgt_1/

[root@localhost 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

[root@localhost qla2xxx]# cat 21\:00\:00\:0e\:1e\:c2\:3e\:a0/tpgt_1/

acls/   attrib/ auth/   enable  lun/    np/     param/

[root@localhost 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。