Скачать или смотреть Part47 Using iSCSI as a High Speed Shared Data Source

When a deployment after Imaging needs to copy a large amount Application Data, you could use SMB file share, VHD or iSCSI. iSCSI is much the quickest (block vs file based transfers).

Test in the lab shows SMB 4mins 50 secs, iSCSI 10 secs - 30x faster

This video describes the setup of an iSCSI target on Linux and a WIndows Initiator.

00:00 SMB File Copy - took 4mins 50 sec

01:46 iSCSI file copy - took 10 secs

02:13 Setup iSCSI Target - install tgt
This is on a Linux system. Other targets are available!
sudo apt-get install tgt

02:40 Create a Backing Store file
user1@RedDev1:~$ sudo dd if=/dev/zero of=iSCSI/windows1.img bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB, 10 GiB) copied, 185.568 s, 57.9 MB/s
user1@RedDev1:~$

03:51 Create targets.conf
Create / Edit /etc/tgt/conf.d/targets.conf with blocksize 4096. Default is 512 bytes
XML with angled brackets not allowed in YouTube. [CHANGEME1] less than, [CHANGEME2] greater
[CHANGEME2]target iqn.2008-09.com.example:server.target3[CHANGEME1]
[CHANGEME2]backing-store /home/user1/iSCSI/windows1.img[CHANGEME1]
block-size 4096
[CHANGEME2]/backing-store[CHANGEME1]
[CHANGEME2]/target[CHANGEME1]
The backing store could be another device such as /dev/sdb

04:20 Restart tgt with new targets.conf
user1@RedDev1:~$ sudo service tgt restart
user1@RedDev1:~$ sudo service tgt status

05:04 iSCSI Initiator on Windows

05:21 Use Disk Manager to Initialize and Format the iSCSI Disk

06:43 Conclusions, block size matters. Multiple Initiators (Clients) are not a problem when app data is read only