iSCSI Subsystem Frequently Asked Questions

Q1. I successfully created a RAID volume above 2TB in capacity from the Management GUI. Why is it not detected?
A. Logical volumes above 2TB can be created from the Management GUI, but certain operating systems such as Windows XP 32-bit have a 2TB limitation. You will only be able to make use of a RAID set above 2TB if you have Windows Server 2003 SP1 or later, Windows XP 64-bit, Windows Vista, Windows 7. These versions give you the option to create GPT disks (GUID Partition Table) to a theoretical 256TB of partition capacity. More information about GPT disks can the found here.


Q2. I successfully created a RAID volume above 2TB but Disk Management shows a volume set up as multiple 2TB partitions.

A. In the operating systems supporting over 2TB, the default type of disks configured would be basic disks (MBR disks), which are limited to 2TB volume capacity. If basic disks are ed in the newer operating systems, Disk Management will automatically split up the volumes into 2TB partitions. Just GPT when the disk is initializing to create volumes over 2TB. Please keep in mind that GPT disks will only work on Windows Server 2003 SP1 or Windows 64-bit, Windows Vista, Windows 7, and are not compatible with older operating systems.


Q3. What is the maximum number of SATA drives capable of being installed inside the Storage Rack, Storage Tower, Storage Tower II after the iSCSI Subsystem has been installed?

A. Below is a chart which lists the maximum number of supported drives for each external storage unit after installation of the iSCSI Subsystem along with the required hardware needed to accommodate all the drives.

Storage Unit 3.5" SATA hard drives 2.5" SATA hard drives
Storage Tower
(3 5.25" drive bays
5
(1x Disk Array 5SA)
12
(3x 2.5" Disk Array 4SA)
Storage Tower II
(1 5.25" drive bay
1
(any Drive Cartridge System or Mobile Rack)
4
(1x 2.5" Disk Array 4SA)
Storage Rack
(8 5.25" drive bays)
13
(2x Disk Array 5SA, 1x Disk Array 3SA)
32
(8x 2.5" Disk Array 4SA)


Q4. Where can i find software iSCSI Initiators for my operating system?

A. See below for more information.

Windows
Windows Vista, Windows 7 has a built in iSCSI initiator and therefore does not need to install any madditional software. Select the iSCSI Initiator and begin configuration. For older Windows operating systems such as Windows XP, you will need to download and install the Microsoft iSCSI Initiator available for free download from Microsoft.
Download information and installation instructions for Windows

Ubuntu Linux
You need to install open-iscsi package for high performance, transport independent iSCSI implementation under Ubuntu Linux. This package is also known as the Linux Open-iSCSI Initiator. Tested on Ubuntu kernel 2.6.24-21. The package "open-iscsi" is not available in Edgy but in Feisty, Gutsy and Hardy.
Download information and installation instructions for Ubuntu

Solaris
The Solaris iSCSI initiator is part of the kernel on Solaris 10 SunOS 5.10 Generic 118855-14 i86pc i386 i86pc. You need to enable the service to be able to connect to an iSCSI target like the ISC8P2G iSCSI subsystem.
Download information and installation instructions for Solaris

Mint 5
You need to install open-iscsi package for high performance, transport independent iSCSI implementation under Mint 5 Linux. This package is also known as the Linux Open-iSCSI Initiator. Tested on Mint 5 kernel 2.6.24-16. All IP addresses are for illustration purposes only.
Download information and installation instructions for Mint

Mac OS X
There are several free and commercial iSCSI Initiators available developed for Mac OS X. Mac iSCSI Initiator 1 and Mac iSCSI Initiator 2.



Q5. What are the features of all the different types of RAID sets able to be created by the iSCSI Subsystem?

A. See below for more information.

RAID Level Description Number of Drives Needed
RAID 0 Disk striping RAID 0 needs at least two hard drives
RAID 1 Disk mirroring over two disks RAID 1 needs at least two hard drives
N-way mirror Extension to RAID 1 level It has N copies of the disk
RAID 3 Striping with parity on the dedicated disk RAID 3 needs at least three hard drives
RAID 5 Striping with interspersed parity over the member disks RAID 5 needs at least three hard drives
RAID 6 2-dimensional parity protection over the member disks RAID 6 needs at least four hard drives
RAID 0+1 Mirroring of the member RAID 0 volumes RAID 0+1 needs at least four hard drives
RAID 10 Striping over the member RAID 0 volumes RAID 10 needs at least four hard drives
RAID 30 Striping over the member RAID 3 volumes RAID 30 needs at least six hard drives
RAID 50 Striping over the member RAID 5 volumes RAID 50 needs at least six hard drives
RAID 60 Striping over the member RAID 6 volumes RAID 60 needs at least eight hard drives
JBOD The abbreviation of &ldquoJust a Bunch Of Disks&rdquo JBOD needs at least one hard drive


Q6. How to setup CHAP authentication and host control access list in ISC8P2G iSCSI subsystem?

A. Download the instructions on setting up the CHAP Authentication and host control accress list

 

Q7. Is there any documentation to describe how to analyze the event logs generated by the iSCSI subsystem?
A. Click here to view or download. The Event log records the information about the iSCSI sub-system. This document will describe how to analyze the event log and provide insight on how to deal with the errors displayed on the log.