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Translating----geekpi
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How to Create and Setup LUNs using LVM in “iSCSI Target Server” on RHEL/CentOS/Fedora – Part II
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================================================================================
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LUN is a Logical Unit Number, which shared from the iSCSI Storage Server. The Physical drive of iSCSI target server shares its drive to initiator over TCP/IP network. A Collection of drives called LUNs to form a large storage as SAN (Storage Area Network). In real environment LUNs are defined in LVM, if so it can be expandable as per space requirements.
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Create LUNS using LVM in Target Server
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### Why LUNS are Used? ###
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LUNS used for storage purpose, SAN Storage’s are build with mostly Groups of LUNS to become a pool, LUNs are Chunks of a Physical disk from target server. We can use LUNS as our systems Physical Disk to install Operating systems, LUNS are used in Clusters, Virtual servers, SAN etc. The main purpose of Using LUNS in Virtual servers for OS storage purpose. LUNS performance and reliability will be according to which kind of disk we using while creating a Target storage server.
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### Requirements ###
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To know about creating a ISCSI Target Server follow the below link.
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- [Create Centralized Secure Storage using iSCSI Target – Part I][1]
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#### Master Server Setup ####
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System information’s and Network setup are same as iSCSI Target Server as shown in Part – I, As we are defining LUNs in same server.
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- Operating System – CentOS release 6.5 (Final)
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- iSCSI Target IP – 192.168.0.200
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- Ports Used : TCP 860, 3260
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- Configuration file : /etc/tgt/targets.conf
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## Creating LUNs using LVM in iSCSI Target Server ##
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First, find out the list of drives using **fdisk -l** command, this will manipulate a long list of information of every partitions on the system.
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# fdisk -l
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The above command only gives the drive information’s of base system. To get the storage device information, use the below command to get the list of storage devices.
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# fdisk -l /dev/vda && fdisk -l /dev/sda
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List Storage Drives
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**NOTE**: Here **vda** is virtual machines hard drive as I’m using virtual machine for demonstration, **/dev/sda** is added additionally for storage.
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### Step 1: Creating LVM Drive for LUNs ###
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We going to use **/dev/sda** drive for creating a LVM.
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# fdisk -l /dev/sda
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List LVM Drive
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Now let’s Partition the drive using fdisk command as shown below.
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# fdisk -cu /dev/sda
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- The option ‘**-c**‘ switch off the DOS compatible mode.
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- The option ‘**-u**‘ is used to listing partition tables, give sizes in sectors instead of cylinders.
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Choose **n** to create a New Partition.
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Command (m for help): n
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Choose **p** to create a Primary partition.
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Command action
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e extended
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p primary partition (1-4)
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Give a Partition number which we need to create.
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Partition number (1-4): 1
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As here, we are going to setup a LVM drive. So, we need to use the default settings to use full size of Drive.
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First sector (2048-37748735, default 2048):
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Using default value 2048
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Last sector, +sectors or +size{K,M,G} (2048-37748735, default 37748735):
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Using default value 37748735
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Choose the type of partition, Here we need to setup a LVM so use **8e**. Use **l** option to see the list of type.
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Command (m for help): t
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Choose which partition want to change the type.
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Selected partition 1
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Hex code (type L to list codes): 8e
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Changed system type of partition 1 to 8e (Linux LVM)
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After changing the type, check the changes by print (**p**) option to list the partition table.
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Command (m for help): p
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Disk /dev/sda: 19.3 GB, 19327352832 bytes
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255 heads, 63 sectors/track, 2349 cylinders, total 37748736 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk identifier: 0x9fae99c8
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Device Boot Start End Blocks Id System
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/dev/sda1 2048 37748735 18873344 8e Linux LVM
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Write the changes using **w** to exit from fdisk utility, Restart the system to make changes.
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For your reference, I’ve attached screen shot below that will give you a clear idea about creating LVM drive.
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Create LVM Partition
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After system reboot, list the Partition table using the following fdisk command.
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# fdisk -l /dev/sda
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Verify LVM Partition
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### Step 2: Creating Logical Volumes for LUNs ###
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Now here, we going to create Physical volume using using ‘pvcreate’ command.
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# pvcreate /dev/sda1
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Create a Volume group with name of iSCSI to identify the group.
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# vgcreate vg_iscsi /dev/sda1
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Here I’m defining 4 Logical Volumes, if so there will be 4 LUNs in our iSCSI Target server.
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# lvcreate -L 4G -n lv_iscsi vg_iscsi
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# lvcreate -L 4G -n lv_iscsi-1 vg_iscsi
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# lvcreate -L 4G -n lv_iscsi-2 vg_iscsi
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# lvcreate -L 4G -n lv_iscsi-3 vg_iscsi
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List the Physical volume, Volume group, logical volumes to confirm.
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# pvs && vgs && lvs
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# lvs
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For better understanding of the above command, for your reference I’ve included a screen grab below.
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Creating LVM Logical Volumes
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Verify LVM Logical Volumes
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### Step 3: Define LUNs in Target Server ###
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We have created Logical Volumes and ready to use with LUN, here we to define the LUNs in target configuration, if so only it will be available for client machines (Initiators).
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Open and edit Targer configuration file located at ‘/etc/tgt/targets.conf’ with your choice of editor.
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# vim /etc/tgt/targets.conf
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Append the following volume definition in target conf file. Save and close the file.
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi
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</target>
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi-1
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</target>
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi-2
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</target>
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi-3
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</target
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Configure LUNs in Target Server
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- iSCSI qualified name (iqn.2014-07.com.tecmint:tgt1).
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- Use what ever as your wish.
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- Identify using target, 1st target in this Server.
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- 4. LVM Shared for particular LUN.
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Next, reload the configuration by starting **tgd** service as shown below.
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# /etc/init.d/tgtd reload
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Reload Configuration
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Next verify the available LUNs using the following command.
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# tgtadm --mode target --op show
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List Available LUNs
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LUNs Information
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The above command will give long list of available LUNs with following information.
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- iSCSI Qualified Name
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- iSCSI is Ready to Use
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- By Default LUN 0 will be reserved for Controller
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- LUN 1, What we have Defined in the Target server
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- Here i have defined 4 GB for a single LUN
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- Online : Yes, Its ready to Use the LUN
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Here we have defined the LUNs for target server using LVM, this can be expandable and support for many features such as snapshots. Let us see how to authenticate with Target server in PART-III and mount the remote Storage locally.
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/create-luns-using-lvm-in-iscsi-target/
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作者：[Babin Lonston][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.tecmint.com/author/babinlonston/
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[1]:http://www.tecmint.com/create-centralized-secure-storage-using-iscsi-targetin-linux/
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@ -0,0 +1,232 @@
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如何在RHEL/CentOS/Fedora中使用LVM创建和设置LUN- 第二部分
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================================================================================
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LUN是逻辑单元号，它与iSCSI存储服务器共享。物理iSCSI target服务器共享它的驱动器来初始化TCP/IP网络。驱动器的集合称作LUN来幸存一个大型存储也就是SAN（Storage Area Network）。在真实环境中LUN在LVM中定义，因此它可以按需扩展。
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Create LUNS using LVM in Target Server
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### 为什么使用LUN？ ###
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LUN用于存储，SAN存储大多数有LUN的集群来组成池，LUN由几块物理驱动器组成。我们可以使用LUN作为系统物理驱动器来安装操作系统，LUN在集群、虚拟服务器、SAN中使用。在虚拟服务器中使用LUN的目的是作为系统存储。LUN的性能和可靠性根据在创建目标存储服务器时所使用的驱动器决定。
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### 需求 ###
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要了解创建iSCSI target服务器点击下面的链接。
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- [使用iSCSI target创建爱你集中话安全存储][1]
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#### 主服务器设置 ####
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系统信息和网络设置部分与已经写的iSCSI Target服务相同 - 我们在相同的服务器上定义LUN。
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- 操作系统 – CentOS release 6.5 (最终版)
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- iSCSI Target IP – 192.168.0.200
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- 使用的端口 : TCP 860, 3260
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- 配置文件 : /etc/tgt/targets.conf
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## 在iSCSI Target Server使用LVM创建LUN ##
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首先，用**fdisk -l**命令找出驱动器的列表，这会列出系统中所有分区的列表。
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# fdisk -l
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上面的命令只会给出基本系统的驱动器信息。为了个到存储设备的信息，使用下面的命令来的到存储设备的列表。
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# fdisk -l /dev/vda && fdisk -l /dev/sda
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列出存储设备
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**注意**：这里**vda**是虚拟机硬盘，因为我使用的是虚拟机来用于演示，**/dev/sda** 是额外加入的存储。
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### 第一步： 创建用于LUN的LVM ###
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我们使用**/dev/sda**驱动器来创建LVM。
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# fdisk -l /dev/sda
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列出LVM驱动器
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现在让我们如下使用fdisk命令列出驱动器分区。
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# fdisk -cu /dev/sda
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- The option ‘**-c**‘ 关闭DOS兼容模式。
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- The option ‘**-u**‘ 用于列出分区表，给出扇区而不是柱面的大小。
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使用**n**创建新的分区。
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Command (m for help): n
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使用**p**创建主分区。
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Command action
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e extended
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p primary partition (1-4)
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给我们创建的分区一个分区号。
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Partition number (1-4): 1
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到这里，我们就要设置LVM驱动器了。因此，我们需要使用默认的设置来使用整个驱动器。
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First sector (2048-37748735, default 2048):
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Using default value 2048
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Last sector, +sectors or +size{K,M,G} (2048-37748735, default 37748735):
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Using default value 37748735
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选择分区的类型，这里我们要设置LVM，因此使用**8e**。使用**l**列出所有的类型。
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Command (m for help): t
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选择想要改变类型的分区。
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Selected partition 1
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Hex code (type L to list codes): 8e
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Changed system type of partition 1 to 8e (Linux LVM)
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在改变完类型之后，通过打印（**p**）选项来列出分区表。
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Command (m for help): p
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Disk /dev/sda: 19.3 GB, 19327352832 bytes
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255 heads, 63 sectors/track, 2349 cylinders, total 37748736 sectors
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Units = sectors of 1 * 512 = 512 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
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I/O size (minimum/optimal): 512 bytes / 512 bytes
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Disk identifier: 0x9fae99c8
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Device Boot Start End Blocks Id System
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/dev/sda1 2048 37748735 18873344 8e Linux LVM
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使用**w**写入设置并退出fdisk工具，重启系统使设置生效。
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作为参考，我下面附上了截图来给你在创建LVM驱动器时一个明确的指导。
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创建LVM分区
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系统重启后，使用fdisk命令列出分区表。
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# fdisk -l /dev/sda
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验证LVM分区
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### 第二步： 为LUN创建逻辑卷 ###
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现在我们使用‘pvcreate’命令创建物理卷。
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# pvcreate /dev/sda1
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用iSCSI的名字创建卷组来区分组。
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# vgcreate vg_iscsi /dev/sda1
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这里我定义了4个逻辑卷，因此在我的iSCSI target上就会有4个LUN。
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# lvcreate -L 4G -n lv_iscsi vg_iscsi
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# lvcreate -L 4G -n lv_iscsi-1 vg_iscsi
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# lvcreate -L 4G -n lv_iscsi-2 vg_iscsi
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# lvcreate -L 4G -n lv_iscsi-3 vg_iscsi
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列出物理卷、卷组和逻辑卷确定。
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# pvs && vgs && lvs
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# lvs
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为了更好地理解上面的命令，我在下面包含了截图作为参考。
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创建LVM逻辑卷
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验证LVM逻辑卷
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### 第三步: 在Target Server中定义LUN ###
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我们已经创建了逻辑卷并准备使用LUN，现在我们在target配置中定义LUN，如果这样那么它只能用在客户机中（启动器）。
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用你选择的编辑器打开位于‘/etc/tgt/targets.conf’的target配置文件。
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# vim /etc/tgt/targets.conf
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追加下面的target配置文件中的定义。保存并关闭文件。
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi
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</target>
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi-1
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</target>
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi-2
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</target>
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<target iqn.2014-07.com.tecmint:tgt1>
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backing-store /dev/vg_iscsi/lv_iscsi-3
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</target
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在target中配置LUN
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- iSCSI 限定名 (iqn.2014-07.com.tecmint:tgt1).
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- 随你怎么使用
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- 确定使用目标， 这台服务器中的第一个目标
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- 4. LVM共享特定的LUN。
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接下来使用下面命令重载**tgd**服务配置。
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# /etc/init.d/tgtd reload
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重载配置
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接下来使用下面的命令验证可用的LUN。
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# tgtadm --mode target --op show
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列出可用LUN
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LUN信息
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The above command will give long list of available LUNs with following information.
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上面的命令会列出可用LUN的下面这些信息
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- iSCSI 限定名
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- iSCSI 准备使用
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- 默认LUN 0被控制器保留
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- LUN 1是我们定义的target服务器
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- 这里我为每个LUN都定义了4GB
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- 在线： 是的，这就是可以使用的LUN
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现在我们已经使用LVM为target服务器定义了LUN，这可扩展并且支持很多特性，如快照。我们将会在第三部分了解如何用target服务器授权，并且本地挂载远程存储。
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/create-luns-using-lvm-in-iscsi-target/
|
||||
|
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作者：[Babin Lonston][a]
|
||||
译者：[geekpi](https://github.com/geekpi)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
|
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|
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[a]:http://www.tecmint.com/author/babinlonston/
|
||||
[1]:http://www.tecmint.com/create-centralized-secure-storage-using-iscsi-targetin-linux/
|
||||
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Reference in New Issue
Block a user