What is ISCSI? And why is it mentioned in NAS all the time

What is ISCSI? And why is it mentioned in NAS all the time



What is Internet Small Computer Systems and why has iSCSI Interface

In computing, iSCSI (/aɪˈskʌzi/ (About this sound listen) eye-SKUZ-ee) is an acronym for Internet Small Computer Systems Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities. It provides block-level access to storage devices by carrying SCSI commands over a TCP/IP network. iSCSI is used to facilitate data transfers over intranets and to manage storage over long distances. It can be used to transmit data over local area networks (LANs), wide area networks (WANs), or the Internet and can enable location-independent data storage and retrieval.

The protocol allows clients (called initiators) to send SCSI commands (CDBs) to storage devices (targets) on remote servers. It is a storage area network (SAN) protocol, allowing organizations to consolidate storage into storage arrays while providing clients (such as database and web servers) with the illusion of locally attached SCSI disks.[1] It mainly competes with Fibre Channel, but unlike traditional Fibre Channel which usually requires dedicated cabling,[a] iSCSI can be run over long distances using existing network infrastructure.[2] iSCSI was pioneered by IBM and Cisco in 1998 and submitted as a draft standard in March 2000.

Did you enjoy the video? Find it helpful? Want to hear more? Of course you want to…you’re only human! Why not subscribe to save you searching next time

Are you interested in all things data storage. Perhaps you are a Mac users and want to know if this NAS, DAS, Cable or Drive will work for you? That is where SPAN and Robbie can help. For over 20 years SPAN has been helping companies and individuals worldwide with their digital archive and storage needs. Alongside that Robbie (Robert Andrews if you want to be delightfully formal) has been spending the last few years keeping you up to date on all things data and won’t shut up about it!

If you are as interested in data as we are, then you can find us in a number of ways. SPAN can be reached here SPAN – However if you want to be kept up to date with new releases, news and keep your finger on the pulse of data storage, follow us below.

Find us on

Follow us on our SPAN Twitter –
Or follow and speak with Robbie directly on his Twitter –

Still not enough? Then why not visit and subscribe to our blog. Upddated regularly it gives you an far wordier version than SPANTV as well as provide you with hints and tips on how to make the most of your hardware here

Don’t forget to visit them on Facebook to entry prize draws, giveaways and competitions, as well as hear about the latest news, NAS releases & offers –

26 thoughts on “What is ISCSI? And why is it mentioned in NAS all the time

  1. Hi. I want to make sure I am understanding the benefits of this for a particular situation. I am creating an environment in which I will want a Server 2016 system on a VM on a Synology RS3617RPxs unit. This server 2016 system will be accessed by 30 or so workstations for the accounting software that will be installed on it. In that situation am I to understand that the VM machine would perform better if installed on an ISCSI LUN instance?
    Thank you.

  2. Thank you!! Phew.. So much better than my teacher explains it. I'm basically learning yrom youtube cause my teacher isn't very good at teaching… at all. He's from microsoft which might explain it.

  3. Brings back memories of using my Mac Plus with an external chain of scsi devices (10 mb hdd!) and a termination plug.

  4. With iSSCI it's also important to know the storage (target) on the NAS or SAN storage server isn't the drive itself it's a file on the drive. That's probably why it's referred to as a target not a drive. You can have multiple targets on the same drive.

  5. Hello all

    I would like to use my Synology as a storage extension for our VMware-based server (esxi).
    I can connect the server to Synology via ISCI.
    The server creates a file (VMFS?) nn the Synology as its file system.

    My question is:
    Will the SSD cache boost the system at this constellation?

    Thanks for an answer.

  6. so this may be the solution i am looking for. i want to download virtual box on my ds918+ and all the vm data on it and run it from my macbook pro because my mac only has 100gb and i need more then that. is this possible via this option?

  7. Hello This is Rakib Hossen.
    I Create A iscsi target On a supermicro Storage server . Storage Size is 60TB after Raid 6.
    * When I create a iscsi volume for iscsi target that says the size of the volume must be 8MB to 16 TB . Why that. ( however I solve that to extend virtual disk)
    * After I create iscsi target I give access two client, one Client-1 , Client-2, via iqn. I successfully connect and mount volume booth client There is no issue to connect. ( Booth client and server is windows server 2012-R2 licence version )
    But when I update or create file or folder on the mounted volume from client -1 it transfer done but when I see same volume from client -2 there is empty, there is no file or folder. Then I tried to send some file of folder from client -2 it's transfer fine, but I can't see those file from client-1 that I send from client -2, Still see old file that was I sen from Client-1
    What is the problem please help me

Leave a Reply

Your email address will not be published. Required fields are marked *