SCSI共享磁盘

服务器端：

[root@scsi ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32212254720 bytes

255 heads, 63 sectors/track, 3916 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0001a6d8

Device Boot Start End Blocks Id System

/dev/sda1 1 383 3072000 82 Linux swap / Solaris

Partition 1 does not end on cylinder boundary.

/dev/sda2 * 383 3917 28384256 83 Linux

Disk /dev/sdb: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0003b191

Device Boot Start End Blocks Id System

Disk /dev/sdc: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00060b5d

Device Boot Start End Blocks Id System

[root@scsi ~]# rpm -qa|grep scsi

iscsi-initiator-utils-6.2.0.873-10.el6.x86_64

scsi-target-utils-1.0.24-10.el6.x86_64

[root@scsi ~]# vim /etc/tgt/targets.conf

backing-store /dev/sdb

</target>

[root@scsi ~]# service tgtd status

tgtd is stopped

[root@scsi ~]# service tgtd start

Starting SCSI target daemon: [ OK ]

[root@scsi ~]# chkconfig tgtd on

[root@scsi ~]# service tgtd status

tgtd (pid 6255 6253) is running...

客户端：

[root@shidongye ~]# rpm -qa|grep scsi

lsscsi-0.23-2.el6.x86_64

iscsi-initiator-utils-6.2.0.873-10.el6.x86_64

scsi-target-utils-1.0.24-10.el6.x86_64

[root@shidongye ~]# is

isadump iscsiadm iscsistart isdnconf isdnrate isnsd isodebug isoinfo isosize isql

isaset iscsid iscsiuio isdnctrl isdnrep isnsdd isodump iso-info isovfy

isc-hmac-fixup iscsi-iname isdnbill isdnlog isnsadm isnssetup isohybrid iso-read ispellaff2myspell

[root@shidongye ~]# iscsiadm --mode discoverydb --type sendtargets --portal 192.168.100.77 --discover

192.168.100.77:3260,1 iqn.2008-09.com.example:server.target1

[root@shidongye ~]# iscsiadm --mode node --targetname iqn.2008-09.com.example:server.target1 --portal 192.168.100.77:3260 --login

Logging in to [iface: default, target: iqn.2008-09.com.example:server.target1, portal: 192.168.100.77,3260] (multiple)

[root@shidongye ~]# fdisk -l

Disk /dev/sda: 214.7 GB, 214748364800 bytes

255 heads, 63 sectors/track, 26108 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000e850e

Device Boot Start End Blocks Id System

/dev/sda1 1 2611 20971520 82 Linux swap / Solaris

/dev/sda2 * 2611 26109 188742656 83 Linux

Disk /dev/sdb: 21.5 GB, 21474836480 bytes

64 heads, 32 sectors/track, 20480 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0003b191

Device Boot Start End Blocks Id System

现在可以使用共享磁盘了，但是对于共享磁盘使用需要借助集群文件系统才能发挥功效，否则会造成主机更新不一致问题。