iSCSI

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硬盘接口协议

IDE是一种成熟稳定、价格便宜的并行传输接口。

SATA是一种传输速度更快、数据校验更完整的串行传输接口。

SCSI是一种用于计算机和硬盘、光驱等设备之间系统级接口的通用标准，具有系统资源占用率低、转速高、传输速度快等优点

RAID磁盘阵列

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mdadm -Cv /dev/md0 -n 3 -l 5 -x 1 /dev/sdb /dev/sdc /dev/
sdd /dev/sde
mdadm: layout defaults to left-symmetric
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 512K
mdadm: size set to 20954624K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Thu Sep 24 21:59:57 2017
     Raid Level : raid5
     Array Size : 41909248 (39.97 GiB 42.92 GB)
  Used Dev Size : 20954624 (19.98 GiB 21.46 GB)
   Raid Devices : 3
  Total Devices : 4
    Persistence : Superblock is persistent
    Update Time : Thu Sep 24 22:02:23 2017
          State : clean 
 Active Devices : 3
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 1
         Layout : left-symmetric
     Chunk Size : 512K
           Name : linuxprobe.com:0  (local to host linuxprobe.com)
           UUID : 3370f643:c10efd6a:44e91f2a:20c71f3e
         Events : 26
    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       1       8       32        1      active sync   /dev/sdc
       4       8       48        2      active sync   /dev/sdd
       3       8       64        -      spare   /dev/sde

#iSCSI服务端
yum -y install targetd targetcli
Loaded plugins: langpacks, product-id, subscription-manager
………………省略部分输出信息………………
Installing:
 targetcli noarch 2.1.fb34-1.el7 rhel 55 k
 targetd noarch 0.7.1-1.el7 rhel 48 k
Installing for dependencies:
 PyYAML x86_64 3.10-11.el7 rhel 153 k
 libyaml x86_64 0.1.4-10.el7 rhel 55 k
 lvm2-python-libs x86_64 7:2.02.105-14.el7 rhel 153 k
 pyparsing noarch 1.5.6-9.el7 rhel 94 k
 python-configshell noarch 1:1.1.fb11-3.el7 rhel 64 k
 python-kmod x86_64 0.9-4.el7 rhel 57 k
 python-rtslib noarch 2.1.fb46-1.el7 rhel 75 k
 python-setproctitle x86_64 1.1.6-5.el7 rhel 15 k
 python-urwid x86_64 1.1.1-3.el7 rhel 654 k
………………省略部分输出信息………………
Installed:
 targetcli.noarch 0:2.1.fb34-1.el7 targetd.noarch 0:0.7.1-1.el7 
Dependency Installed:
 PyYAML.x86_64 0:3.10-11.el7 
 libyaml.x86_64 0:0.1.4-10.el7 
 lvm2-python-libs.x86_64 7:2.02.105-14.el7 
 pyparsing.noarch 0:1.5.6-9.el7 
 python-configshell.noarch 1:1.1.fb11-3.el7 
 python-kmod.x86_64 0:0.9-4.el7 
 python-rtslib.noarch 0:2.1.fb46-1.el7 
 python-setproctitle.x86_64 0:1.1.6-5.el7 
 python-urwid.x86_64 0:1.1.1-3.el7 
Complete!

systemctl start targetd
systemctl enable targetd
ln -s '/usr/lib/systemd/system/targetd.service' '/etc/systemd/system/multi-user.target.wants/targetd.service'

targetcli
Warning: Could not load preferences file /root/.targetcli/prefs.bin.
targetcli shell version 2.1.fb34
Copyright 2011-2013 by Datera, Inc and others.
For help on commands, type 'help'.
/> ls
o- / ................................................................... [...]
o- backstores ........................................................ [...]
| o- block ............................................ [Storage Objects: 0]
| o- fileio ........................................... [Storage Objects: 0]
| o- pscsi ............................................ [Storage Objects: 0]
| o- ramdisk .......................................... [Storage Objects: 0]
o- iscsi ...................................................... [Targets: 0]
o- loopback ................................................... [Targets: 0
/> cd /backstores/block
/backstores/block> create disk0 /dev/md0
Created block storage object disk0 using /dev/md0.
/backstores/block> cd /
/> ls
o- / ................... ............................................... [...]
  o- backstores ........................................................ [...]
  | o- block ........................................... [Storage Objects: 1]
  | | o- disk0 .................. [/dev/md0 (40.0GiB) write-thru deactivated]
  | o- fileio .......................................... [Storage Objects: 0]
  | o- pscsi ........................................... [Storage Objects: 0]
  | o- ramdisk ......................................... [Storage Objects: 0]
  o- iscsi ..................................................... [Targets: 0]
  o- loopback .................................................. [Targets: 0]

/> cd iscsi
/iscsi> 
/iscsi> create
Created target iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80.
Created TPG 1.
/iscsi> cd iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80/
/iscsi/iqn.20....d497c356ad80> ls
o- iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80 .... [TPGs: 1]
  o- tpg1 ............................................. [no-gen-acls, no-auth]
    o- acls ........................................................ [ACLs: 0]
    o- luns ........................................................ [LUNs: 0]
    o- portals .................................................. [Portals: 0]
/iscsi/iqn.20....d497c356ad80> cd tpg1/luns
/iscsi/iqn.20...d80/tpg1/luns> create /backstores/block/disk0 
Created LUN 0.

/iscsi/iqn.20...d80/tpg1/luns> cd ..
/iscsi/iqn.20...c356ad80/tpg1> cd acls 
/iscsi/iqn.20...d80/tpg1/acls> create iqn.2003-01.org.linux-iscsi.linuxprobe.
x8664:sn.d497c356ad80:client
Created Node ACL for iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80:
client
Created mapped LUN 0.

/iscsi/iqn.20...d80/tpg1/acls> cd ..
/iscsi/iqn.20...c356ad80/tpg1> cd portals 
/iscsi/iqn.20.../tpg1/portals> create 192.168.10.10
Using default IP port 3260
Created network portal 192.168.10.10:3260.

/iscsi/iqn.20.../tpg1/portals> ls /
o- / ........................... [...]
  o- backstores................. [...]
  | o- block ................... [Storage Objects: 1]
  | | o- disk0 ................. [/dev/md0 (40.0GiB) write-thru activated]
  | o- fileio .................. [Storage Objects: 0]
  | o- pscsi ................... [Storage Objects: 0]
  | o- ramdisk ................. [Storage Objects: 0]
  o- iscsi ..................... [Targets: 1]
  | o- iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80 ... [TPGs: 1]
  |   o- tpg1 .................. [no-gen-acls, no-auth]
  |     o- acls ............................................... [ACLs: 1]
  |     | o- iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80:client
  [Mapped LUNs: 1]
  |     |   o- mapped_lun0 .......................... [lun0 block/disk0 (rw)]  
    o- luns .................... [LUNs: 1]
  |     | o- lun0 .............. [block/disk0 (/dev/md0)]
  |     o- portals ............. [Portals: 1]
  |       o- 192.168.10.10:3260  [OK]
  o- loopback .................. [Targets: 0]
/> exit
Global pref auto_save_on_exit=true
Last 10 configs saved in /etc/target/backup.
Configuration saved to /etc/target/saveconfig.json

systemctl restart targetd
firewall-cmd --permanent --add-port=3260/tcp 
success 

firewall-cmd --reload 
success

#Linux客户端
yum install iscsi-initiator-utils 
Loaded plugins: langpacks, product-id, subscription-manager 
Package iscsi-initiator-utils-6.2.0.873-21.el7.x86_64 already installed and 
latest version 
Nothing to do

vim /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80:client

systemctl restart iscsid
systemctl enable iscsid
ln -s '/usr/lib/systemd/system/iscsid.service' '/etc/systemd/system/multi-user. 
target.wants/iscsid.service'

iscsiadm -m discovery -t st -p 192.168.10.10 192.168.10.10:3260,1 iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80 -p 192.168.10.10 --login
Logging in to [iface: default, target: iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80, portal: 192.168.10.10,3260] (multiple)
Login to [iface: default, target: iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.d497c356ad80, portal: 192.168.10.10,3260] successful.

file /dev/sdb 
/dev/sdb: block special

mkfs.xfs /dev/sdb
log stripe unit (524288 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=/dev/sdb               isize=256    agcount=16, agsize=654720 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0
data     =                       bsize=4096   blocks=10475520, imaxpct=25
         =                       sunit=128    swidth=256 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal log           bsize=4096   blocks=5120, version=2
         =                       sectsz=512   sunit=8 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

mkdir /iscsi
mount /dev/sdb /iscsi
df -h
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root   18G  3.4G   15G  20% /
devtmpfs               734M     0  734M   0% /dev
tmpfs                  742M  176K  742M   1% /dev/shm
tmpfs                  742M  8.8M  734M   2% /run
tmpfs                  742M     0  742M   0% /sys/fs/cgroup
/dev/sr0               3.5G  3.5G     0 100% /media/cdrom
/dev/sda1              497M  119M  379M  24% /boot
/dev/sdb                40G   33M   40G   1% /iscsi

blkid | grep /dev/sdb
/dev/sdb: UUID="eb9cbf2f-fce8-413a-b770-8b0f243e8ad6" TYPE="xfs"

vim /etc/fstab
#
# /etc/fstab
# Created by anaconda on Wed May 4 19:26:23 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/rhel-root                     /            xfs       defaults   1 1
UUID=812b1f7c-8b5b-43da-8c06-b9999e0fe48b /boot        xfs       defaults   1 2
/dev/mapper                               /rhel-swap   swap swap defaults   0 0
/dev/cdrom                                /media/cdrom iso9660   defaults   0 0
UUID=eb9cbf2f-fce8-413a-b770-8b0f243e8ad6 /iscsi xfs defaults,_netdev       0 0

iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.linuxprobe. 
x8664:sn.d497c356ad80 -u
Logging out of session [sid: 7, target : iqn.2003-01.org.linux-iscsi.linuxprobe. 
x8664:sn.d497c356ad80, portal: 192.168.10.10,3260]
Logout of [sid: 7, target: iqn.2003-01.org.linux-iscsi.linuxprobe.x8664:sn.
d497c356ad80,portal:192.168.10.10,3260] successful.

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