OpenWrt iSCSI-将路由器空闲存储挂载为本地硬盘
iSCSI 允许在块级别共享块设备（例如硬盘），本质上将分区和文件系统的完全控制权交给连接到该设备的客户端。
由于其设计限制，同一时间仅允许一个客户端连接。iSCSI 主要用于为缺乏高级存储功能（如 RAID）的商业应用和设备提供网络存储。
- 映射为本地磁盘，可用于安装软件
- 一次仅允许一个客户端连接
- 传输速率取决于路由器硬盘性能和内网带宽
步骤
依赖安装
# 更新软件源
opkg update
# 安装tgt
opkg install tgt
# 安装kmod-scisi-core
opkg install kmod-scsi-core
# 安装cfdisk
opkg install cfdisk配置iSCSI
配置要挂载的磁盘
# 查看分区信息
cfdisk如需重新划分分区，查看分区创建教程
分区创建教程配置完成后，分区信息如下： 
编辑tgt配置
例如要将设备地址为/dev/sda5，大小为174.6GB的磁盘配置为iSCSI设备，则需将设备地址/dev/sda5写入tgt配置文件中
# 编辑tgt配置
vim /etc/config/tgt配置目标1
config target 1
option name 'openwrtiscsit1' # 改为便于识别的名称即可
# list allow_name 'iqn.1994-05.org.example:fedcba987654'
# list allow_address '192.168.2.128/27'配置目标磁盘
config lun 1_1
option device /dev/sda5 # 将硬件地址填写为/dev/sda5
#config lun 2_2
# option device /dev/sdc 配置认证信息
config account
list target 1
# list target 2
option user "openwrt"
option password "123456" wq保存并退出
重启tgt服务
service tgt restart完整配置文件如下：
config options 'tgt'
# iothreads limits number of worker threads per rdwr target, default is 16
# which seems to be too much for an avarage router
option iothreads '2'
# option nop_count '3'
# option nop_interval '1'
# option logging '0'
# list portal '[::1]'
# list portal '127.0.0.1:3261'
# list portal '0.0.0.0:3262'
# list portal '[::]:3263'
config target 1
option name 'openwrtiscsit1'
# list allow_name 'iqn.1994-05.org.example:fedcba987654'
# list allow_address '192.168.2.128/27'
#config target 2
# option name 'iqn.2012-06.org.openwrt:t2'
# all options are set to default, except for the device
# lun "name" is constructed as TGTID_LUN
#config lun 1_1
# option 'device' '/dev/sda'
# type of scsi device. available options: disk, cd, pt (sg passthrough)
# option 'type' 'disk'
# backing store access method: rdwr (read-write), aio (async IO), sg (for pt type only, device must
# option 'bstype' 'aio'
# set sync and/or direct flags when opening device, affect only rdwr
# option 'sync' '0'
# option 'direct' '0'
# block size for lun, default is 512
# option 'blocksize' 4096
# override SCSI mode page, see tgtadm man page for details
# option 'mode_page' 'string'
# vendor, product, revision, SCSI ID and SCSI Serial number
# option 'vendor_id' 'string'
# option 'product_id' 'string'
# option 'product_rev' 'string'
# option 'scsi_id' 'string'
# option 'scsi_sn' 'string'
# refuse write attempts. applies only to disk type
# option 'readonly' '0'
# Disk devices default to non-removable, cd - to removable
# option 'removable' '0'
# 0 = Classic sense format, 1 = Support descriptor format.
# option 'sense_format' '0'
# Rotaion rate: 0: not reported, 1: non-rotational medium (SSD), 2-1024: reserverd, 1025+: "Nominal
# option 'rotation_rate' '0'
# A thin-provisioned LUN is represented as a sparse file.
# When initiators use the SCSI UNMAP command TGTD will release the affected areas back to the files
# This option applies to the disk type and rdwr bstype
# option 'thin_provisioning' '1'
config lun 1_1
option device /dev/sda5
#config lun 2_2
# option device /dev/sdc
config account
list target 1
# list target 2
option user "openwrt"
option password "123456"
#config account
# option target 2
# option user "user2"
# option password "pwd2"
# option outgoing 1Windows端配置iSCSI
Win + S 搜索 iSCSI
输入连接目标
配置用户名、密码
点击连接->高级->启用CHAP登录->名称处输入用户名、目标机密输入密码->确定
使用磁盘管理器初始化磁盘，并新建简单卷即可