ISCSI LINUX（RHEL）的搭建與配置

實驗機器
服務器端：192.168.1.33(virtual)
XP客戶端: 192.168.1.35
RHEL6客戶端：192.168.1.45 (virtual)

----------

服務器端：

一、給33機器添加一塊硬盤。(普通的文件（file）、邏輯卷（LVM）、物理硬盤分區（partition）)

[root@virt ~]# fdisk -l | grep sdb
Disk /dev/sdb: 5368 MB, 5368709120 bytes

二、安裝iscsi服務器端。

yum install scsi-target-utils

三、編輯iscsi

<target bd.kl>
backing-store /dev/sdb #後加入的硬盤
initiator-address 192.168.1.45 #指定IP
initiator-address 192.168.1.35 #指定IP
</target>

四、檢查是否加載成功

[root@virt ~]# tgt-admin --show
Target 1: bd.kl
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags:
    Account information:
    ACL information:
        192.168.1.45
        192.168.1.35

這服務端就開啓了~

----------

客戶端：

一、掃描 iscsiadm -m discovery -t st -p 192.168.1.33

[root@ns ~ 17:29 #18]# iscsiadm  -m  discovery  -t  sendtargets  \
-p 192.168.1.33

192.168.1.33:3260,1 bd.kl

二、鏈接 iscsiadm -m node -T bd.kl -p 192.168.1.33

[root@ns ~ 20:02 #20]#  iscsiadm -m node -T bd.kl -p 192.168.1.33 -l
Logging in to [iface: default, target: bd.kl, portal: 192.168.1.33,3260] (multiple)
Login to [iface: default, target: bd.kl, portal: 192.168.1.33,3260] successful.

三、已經掛載上，用fdisk查看

[root@ns ~ 20:03 #21]# fdisk -l


   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        2611    20970496   83  Linux

Disk /dev/sdb: 5368 MB, 5368709120 bytes
166 heads, 62 sectors/track, 1018 cylinders
Units = cylinders of 10292 * 512 = 5269504 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x47ef00d7

   Device Boot      Start         End      Blocks   Id  System

或者用驅動查看

[root@ns ~ 20:04 #22]# dmesg|tail
scsi 6:0:0:0: RAID              IET      Controller       0001 PQ: 0 ANSI: 5
scsi 6:0:0:0: Attached scsi generic sg2 type 12
scsi 6:0:0:1: Direct-Access     IET      VIRTUAL-DISK     0001 PQ: 0 ANSI: 5
sd 6:0:0:1: Attached scsi generic sg3 type 0
sd 6:0:0:1: [sdb] 10485760 512-byte logical blocks: (5.36 GB/5.00 GiB)
sd 6:0:0:1: [sdb] Write Protect is off
sd 6:0:0:1: [sdb] Mode Sense: 49 00 00 08
sd 6:0:0:1: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 sdb:
sd 6:0:0:1: [sdb] Attached SCSI disk

很清晰是SCSI硬盤。

四、開始掛載

fdisk分區。。。fdisk /dev/sdb -> p -> n -> -> w -> q

分完了，看一下

[root@ns ~ 20:09 #27]# fdisk /dev/sdb -l

Disk /dev/sdb: 5368 MB, 5368709120 bytes
166 heads, 62 sectors/track, 1018 cylinders
Units = cylinders of 10292 * 512 = 5269504 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x47ef00d7

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        1018     5238597   83  Linux

[root@ns ~ 20:11 #30]# mkdir -p /Volume/sdb

[root@ns ~ 20:12 #32]# mkfs.ext4 /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
文件系統標籤=
操做系統:Linux
塊大小=4096 (log=2)
分塊大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
327680 inodes, 1309649 blocks
65482 blocks (5.00%) reserved for the super user
第一個數據塊=0
Maximum filesystem blocks=1342177280
40 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


正在寫入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成


This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

[root@ns ~ 20:11 #31]# vi /etc/fstab
/dev/sdb1               /Volume/sdb             ext4    defaults        0 0

掛載最後一步

[root@ns ~ 20:13 #33]# mount -a

成功。

五、卸載SCSI硬盤，若是不卸載開機會啓動不了。

[root@ns ~ 20:13 #34]# iscsiadm -m node -T bd.kl -p 192.168.1.33 --logout
Logging out of session [sid: 4, target: bd.kl, portal: 192.168.1.33,3260]
Logout of [sid: 4, target: bd.kl, portal: 192.168.1.33,3260] successful.

若是真的沒卸載重啓啓動不起來，那麼

進入單用戶模式

[root@virt ~]# chkconfig | grep iscsi
iscsi           0:off   1:off   2:off   3:on    4:on    5:on    6:off
iscsid          0:off   1:off   2:off   3:on    4:on    5:on    6:off

[root@virt ~]# chkconfig --level 345 iscsi off
[root@virt ~]# chkconfig --level 345 iscsid off

而後進去了再掛載。

OVER.

客戶端爲WINDOWS

一、下載

在http://www.microsoft.com/en-us/download/details.aspx?id=18986下載

Microsoft iSCSI Software Initiator

安裝後

完成。

若是沒有識別的話去設備管理刪掉問好的那個SCSI。直接點卸載或刪除。

----------------------

下邊寫一下部分註釋的配置文件。

ISCSI-SERVER

/etc/tgt/targets.conf


# This is a sample config file for tgt-admin.
# The files ending with '.conf' in this directory will be included.
#
# The "#" symbol disables the processing of a line.

#只有一個邏輯單元的簡單例子，默認容許全部的initiators發起訪問。
# Sample target with one LUN only. Defaults to allow access for all initiators:


#<target iqn.2008-09.com.example:server.target1>
#    backing-store /dev/LVM/somedevice
#</target>

與上面的相同，可是使用direct-store替代backing-srore
# Similar, but we use "direct-store" instead of "backing-store".
# "direct-store" reads drive parameters with sg_inq command and sets them to
//direct-store 讀取設備sg_inq參數
# the target.
# Parameters fatched with sg_inq are:
# - Vendor identification
# - Product identification
# - Product revision level
# - Unit serial number (if present)
# We also specify "incominguser".


一個指定了incominguser的例子
#<target iqn.2008-09.com.example:server.target2>
#    direct-store /dev/sdd
#    incominguser someuser secretpass12
#</target>

一個含有多個邏輯單元的例子，禁止了write-cache(tgtd 默認容許write-cache),設備供應商設置爲"MyVendor"
# An example with multiple LUNs, disabled write-cache (tgtd enables write-cache
# by default) and vendor identification set to "MyVendor"

#<target iqn.2008-09.com.example:server.target3>
#    backing-store /dev/LVM/somedevice1 # Becomes LUN 1
#    backing-store /dev/LVM/somedevice2 # Becomes LUN 2
#    backing-store /dev/LVM/somedevice3 # Becomes LUN 3
#    write-cache off
#    vendor_id MyCompany Inc.
#</target>

與上相同，但咱們從磁盤自己讀取vendor_id, product_id, product_rev 和scsi_sn
# Similar to the one above, but we fetch vendor_id, product_id, product_rev and
# scsi_sn from the disks.
# Vendor identification (vendor_id) is replaced in all disks by "MyVendor"
其中vendor_id參數被設置的MyCompany Inc替代磁盤原有的參數。

#<target iqn.2008-09.com.example:server.target4>
#    direct-store /dev/sdb	# Becomes LUN 1
#    direct-store /dev/sdc	# Becomes LUN 2
#    direct-store /dev/sdd	# Becomes LUN 3
#    write-cache off
#    vendor_id MyCompany Inc.
#</target>


# Note that "first-device-first-lun numbering" will work only for simple
# scenarios above, where _only_ direct-store _or_ backing-store is used.
# If you mix backing-store and direct-store, then all backing-store entries
# are processed before direct-store-entries.

值得注意第一個LUN設備，即爲LUN0，這種狀況只適合以上簡單的情景。即只有 direct-store，或backing-store時。
若是要向如下這種混用，backing-store參數的邏輯單元號要在direct-store前面。

#<target iqn.2008-09.com.example:server.target4>
#    direct-store /dev/sdb	# Becomes LUN 3
#    backing-store /dev/sdc	# Becomes LUN 1
#    direct-store /dev/sdd	# Becomes LUN 4
#    backing-store /dev/sde	# Becomes LUN 2
#</target>


# Even more complicated example - each device has different parameters.
甚至更復雜混亂的例子-每一個設備都有不一樣的參數
# You can use indentation to make the config file more readable.
能夠使用縮格讓配置文件讀起來更方便些。
# Note that LUNs will be assigned more or less randomly here (and still
# backing-store get LUNs assigned before drect-store).
注意在這裏邏輯單元會被或多或少地隨意地分配號碼，但即使這樣backing-store的邏輯單元號仍然在drect-store以前。
# You can specify multiple mode_page parameters (they are commented out
# in this example).
你能夠指定複雜的mode_page參數，在例子中被註釋出來。
# Note that some parameters (write-cache, scsi_sn) were specified "globally".
注意一些參數（如：write-cache,scsi_sn）具備全局參數的特性。
# "Global" parameters will be applied to all LUNs; they can be overwritten
# "locally", per LUN.
全局參數被視爲適用所用的邏輯單元，他們能夠被每一個邏輯單元局部的配置文件所替代
# If lun is not specified, it will be allocated automatically (first available).
若是邏輯單元號碼沒有被指定，他將會被自動指定。


#<target iqn.2008-09.com.example:server.target5>

#    <direct-store /dev/sdd>
#	vendor_id VENDOR1
#	removable 1
#	device-type cd
#	lun 1
#    </direct-store>

#    <direct-store /dev/sda>
#	vendor_id VENDOR2
#	lun 2
#    </direct-store>

#    <backing-store /dev/sdb1>
#	vendor_id back1
#	scsi_sn SERIAL
#	write-cache on
	# lun 3		# lun is commented out - will be allocated automatically//lun 3被註釋上了，他將會被自動指定
#   </backing-store>

#    <backing-store /dev/sdd1>
#	vendor_id back2
	#mode_page 8:0:18:0x10:0:0xff....
	#mode_page 8:0:18:0x10:0:0xff....
	#bs-type aio
#	lun 15
#    </backing-store>

# Some more parameters which can be specified locally or globally:
更多的可被用於局部的和全局的參數以下：
    #scsi_id ...
    #scsi_sn ...
    #vendor_id ...
    #product_id ...
    #product_rev ...
    #sense_format ...
    #removable ...
    #online ...
    #path ...
    #mode_page 8:0:18:0x10:0:0xff....
    #mode_page 8:0:18:0x10:0:0xff....
    #device-type ...
    #bs-type ...	# backing store type - default rdwr, can be aio, mmap, etc...
    #allow-in-use yes	# if specified globally, can't be overwritten locally

#    write-cache off
#    scsi_sn multipath-10

# Parameters below are only global. They can't be configured per LUN.
以下的參數只能用於全局參數，而不能被用於局部
# Only allow connections from 192.168.100.1 and 192.168.200.5
只容許從192.168.100.1和192.168.200.5進行鏈接
#    initiator-address 192.168.100.1
#    initiator-address 192.168.200.5

    # Tuning parameters (global, per target)
    #MaxRecvDataSegmentLength 8192
    #MaxXmitDataSegmentLength 8192
    #HeaderDigest None
    #DataDigest None
    #InitialR2T Yes
    #MaxOutstandingR2T 1
    #ImmediateData Yes
    #FirstBurstLength 65536
    #MaxBurstLength 262144
    #DataPDUInOrder Yes
    #DataSequenceInOrder Yes
    #ErrorRecoveryLevel 0
    #IFMarker No
    #OFMarker No
    #DefaultTime2Wait 2
    #DefaultTime2Retain 20
    #OFMarkInt Reject
    #IFMarkInt Reject
    #MaxConnections 1

# Allowed incoming users
容許訪問的用戶
#    incominguser user1 secretpass12
#    incominguser user2 secretpass23

    # Outgoing user
#    outgoinguser userA secretpassA

#</target>


# The device will have lun 1 unless you specify something else
#<target iqn.2008-09.com.example:server.target6>
#    backing-store /dev/LVM/somedevice
#    lun 10
#</target>


# Devices which are in use (by system: mounted, for swap, part of RAID, or by
# userspace: dd, by tgtd for another target etc.) can't be used, unless you use
# --force flag or add 'allow-in-use yes' option
被使用中的設備（系統佔用：掛載，使用中的交換分區，RAID的一部分，或用戶空間：
dd, 或被其餘的目標所使用）是不能被使用的，除非使用--force 或者添加allow-in-use yes參數

#<target iqn.2008-09.com.example:server.target7>
#    backing-store /dev/LVM/somedevice
#    allow-in-use yes
#</target>

#<target iqn.2008-09.com.example:server.target8>
#    <backing-store /dev/LVM/somedevice>
#	 scsi_sn serial1
#    </backing-store>

#    <backing-store /dev/LVM/somedevice2>
#	 scsi_sn serial2
#    </backing-store>

#    allow-in-use yes
#</target>

# Not supported configurations, and therefore, commented out:
不支持的配置方式，所以被註釋上了。

#<target iqn.2008-09.com.example:server.target9>
#    backing-store /dev/LVM/somedevice1
#    backing-store /dev/LVM/somedevice2
#    lun 10
#    lun 11
#</target>

#<target iqn.2008-09.com.example:server.target10>
#    <direct-store /dev/sdd>
#	 vendor_id VENDOR1
#    </direct-store>
#
#    direct-store /dev/sdc
#</target>

# This one will break the parser:
這個會中斷解析
#<target iqn.2008-09.com.example:server.target11>
#    <direct-store /dev/sdd>
#	 vendor_id VENDOR1
#    </direct-store>
#
#    direct-store /dev/sdc
#
#    <direct-store /dev/sdd>
#	 vendor_id VENDOR1
#    </direct-store>
#</target>