2008年（8065）
分类： 服务器与存储
2008-05-09 12:41:00
实战系统版本：
[root@trade /]# cat /etc/redhat-release
Red Hat Enterprise AS release 3 (Taroon Update 7)
据资料介绍，redhat linux as3 从Update 4的版本开始，开始内置支持iscsi，集成iscsi-initiator。
[root@trade /]# rpm -qa|grep iscsi
iscsi-initiator-utils-3.6.3-3
step1：生成iSCSI
[root@trade /]# iscsi-iname
iqn.1987-05.com.cisco:01.d7e04ce46ca5
step2:配置/etc/iscsi.conf，里面参数可以很多，但是最简单就是：
#DiscoveryAddress=
DiscoveryAddress=172.16.35.228
TargetName=iqn.1987-05.com.cisco:test2
step3：诊断、连接netapp
[root@trade /]#/etc/init.d/iscsi start ，如果长期使用，还需要用setup命令，把iscsi服务设置成开机自动启动。
Checking iscsi config: [ OK ]
Loading iscsi driver: [ OK ]
Starting iscsid: [ OK ]
还可以用dmesg命令观察lun的连接情况，确定lun的设备名。
#dmesg
iSCSI: 3.6.1 (22-Sep-2004) built for 2.4.21-27.ELsmp
iSCSI: will translate deferred sense to current sense on disk command responses
iSCSI: control device major number 254
iSCSI: allocating task cache iscsi_0000729382 with reaping disabled
iSCSI: detected HBA f6aed100, host #2
scsi2 : iSCSI 3.6.1 (22-Sep-2004)
iSCSI: bus 0 target 0 = iqn.1992-08.com.netapp:sn.84192734
iSCSI: bus 0 target 0 portal 0 = address 172.16.35.228 port 3260 group 1
iSCSI: bus 0 target 0 trying to establish session c3ae8000 to portal 0, address 172.16.35.228 port 3260 group 1
iSCSI: bus 0 target 0 established session c3ae8000 #1, portal 0, address 172.16.35.228 port 3260 group 1
scsi singledevice 2 0 0 1
Vendor: NETAPP Model: LUN Rev: 0.2
Type: Direct-Access ANSI SCSI revision: 04
Attached scsi disk sdb at scsi2, channel 0, id 0, lun 1
iSCSI: session c3ae8000 recv_cmd f693aa00, cdb 0x0, status 0x2, response 0x0, senselen 18, key 06, ASC/ASCQ 29/00,
itt 3 task f6906f74 to (2 0 0 1), iqn.1992-08.com.netapp:sn.84192734
iSCSI: Sense f0000600 0000000a 00000000 29000000 0000
SCSI device sdb: 20971520 512-byte hdwr sectors (10737 MB)
sdb: unknown partition table
查看设备信息
此时可以使用iscsi-ls等命令查看相关Lun信息
# iscsi-ls
****************************************************************************
SFNet iSCSI Driver Version ...4:0.1.11(12-Jan-2005)
****************************************************************************
TARGET NAME : iqn.1992-08.com.netapp:sn.84192734
TARGET ALIAS :
HOST ID : 0
BUS ID : 0
TARGET ID : 0
TARGET ADDRESS : 172.16.35.228:3260,1
SESSION STATUS : ESTABLISHED AT Tue Nov 8 15:43:38 CST 2005
SESSION ID : ISID 00023d000001 TSIH 101
****************************************************************************
step4：格式化设备待用
# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 20480.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): p
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
64 heads, 32 sectors/track, 20480 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-20480, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-20480, default 20480): +4096M
Command (m for help): p
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
64 heads, 32 sectors/track, 20480 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 3907 4000752 83
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (3908-20480, default 3908):
Using default value 3908
Last cylinder or +size or +sizeM or +sizeK (3908-20480, default 20480):
Using default value 20480
Command (m for help): p
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
64 heads, 32 sectors/track, 20480 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 3907 4000752 83
/dev/sdb2 3908 20480 16970752 83
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# cd /
# mkdir netdisk 建立mount点
# mkfs /dev/sdb1
mke2fs 1.32 (09-Nov-2002)
Filesystem label=
OS type:
Block size=4096 (log=2)
Fragment size=4096 (log=2)
500960 inodes, 1000188 blocks
50009 blocks (5.00%) reserved for the super user
First data block=0
31 block groups
32768 blocks per group, 32768 fragments per group
16160 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
# mount /dev/sdb1 /netdisk
# df -k /netdisk
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdb1 3937820 20 3737764 1% /data1
