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如何通过 Linux 访问 ReadyNAS 的 iSCSI Target

NETGEAR ReadyNAS是统一存储设备,可以同时提供NAS共享和ISCSI访问方式。如果我们的主机是Linux系统,那应该如何通过Linux主机连接ReadyNAS存储设备的iSCSI Target呢?

首先在ReadyNAS设备上应该已经建立了LUN和LUN Group,并且将LUN指派到LUN Group中,这个LUN Group就是我们要访问的iSCSI Target。这个建立过程不再赘述,我们主要看一下Linux主机上的连接操作。基本步骤如下:

  1. 使用root身份进入Linux系统,并且启动Linux的iSCSI服务。以Centos和Red Hat为例:
    [root@localhost ~]# service iscsi start
    [root@localhost ~]# service iscsid start
    [root@localhost ~]# chkconfig iscsi on
    [root@localhost ~]# chkconfig iscsid on
    上述命令的目的是启动iSCSI服务并且设置为自动启动。
  2. 发现ReadyNAS上的iSCSI Target。运行以下命令可以发现目标的iqn:
    [root@localhost ~]#iscsiadm -m discovery -t st -p 10.45.1.50:3260
    10.45.1.50:3260,1 iqn.1994-11.com.netgear:nas-34-ea-30:f4d861d5:group1
  3. 记下来进行连接操作,命令示例如下:
    [root@localhost ~]# iscsiadm -m node -T iqn.1994-11.com.netgear:nas-34-ea-30:f4d861d5:group1 -p 10.45.1.50:3260 -l
    Logging in to [iface: default, target: iqn.1994-11.com.netgear:nas-34-ea-30:f4d861d5:group1, portal: 10.45.1.50,3260] (multiple)
    Login to [iface: default, target: iqn.1994-11.com.netgear:nas-34-ea-30:f4d861d5:group1, portal: 10.45.1.50,3260] successful.
  4. 连接操作完成后,Linux主机上会看到增加了一块磁盘,可以使用fdisk命令查看磁盘,并对磁盘进行分区操作,然后再使用mkfs命令建立文件系统并mount到Linux系统中。

后续命令及输出信息供大家参考,具体情况以实际设备情况为准。

查看磁盘信息:

[root@localhost ~]# fdisk -l
Disk /dev/sdc: 107.4 GB, 107374182912 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 4194304 bytes
Disk identifier: 0x00000000

分区操作:

[root@localhost ~]# fdisk /dev/sdc
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x10e41df7.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
                     switch off the mode (command 'c') and change display units to
                     sectors (command 'u').
Command (m for help): n
Command action
    e extended
    p primary partition (1-4)

p

Partition number (1-4): 1
First cylinder (1-13054, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054):
Using default value 13054
Command (m for help): p
Disk /dev/sdc: 107.4 GB, 107374182912 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 4194304 bytes
Disk identifier: 0x10e41df7
Device Boot Start End Blocks Id System
/dev/sdc1 1 13054 104856223+ 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.

建立文件系统:

[root@localhost ~]# mkfs.ext4 /dev/sdc1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=1024 blocks
6553600 inodes, 26214055 blocks
1310702 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
800 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
            32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
            4096000, 7962624, 11239424, 20480000, 23887872
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:
done
This filesystem will be automatically checked every 30 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

挂载磁盘:

[root@localhost ~]# mkdir /iscsi
[root@localhost ~]# mount /dev/sdc1 /iscsi