Imran: Hey, folks, in this video,
we are going to talk about computer storage.
We all know computer storage is used
to store your computer data or information.
Based on my experience, I think there
are four different type of storages in IT.
Number one is the local storage.
It's local storage that is inside
of your computer or your PC.
For example, RAM, which is also referred to as memory,
Hard disk drive, solid state drive, or cache,
or anything like that that is sitting on your motherboard
or attached directly to or with your computer's motherboard
is considered local storage.
Then we have DAS, which stands for Direct Attached Storage,
and example of direct attached storage is CD/DVD,
which is sometimes people can also categorize CD/DVD
as local storage.
Also, USB flash drive.
All you have to do is stick that flash drive
straight into the USB slot on your computer,
and it will detect right away,
so that is direct attached storage.
External disks.
So if you buy an external disk from anywhere,
and you could attach it through a SCSI cable,
or you could attach it to a USB cable,
that is considered as a direct attached storage.
The next two one we are going to talk about
are actually considered more of a corporate level
computer storage.
The first one is SAN, and the second one is NAS.
So let's talk about SAN first.
SAN stands for Storage Area Network,
storage attached through iSCSI or fiber cable,
so your computer is attached to this type of storage
through iSCSI cables or fiber cables.
So how your computer detects that storage?
Well, your computer has to have the SAN adapters,
which is the SAN cards,
which is also called or referred to as HBAs
that are installed on top of your motherboard
as a physical card.
Then you attach that fiber cable directly to those cards,
and then you install the driver,
and then you go and discover that storage,
and that storage is shown to you on a different numbers,
which they call it the WWN number.
Then comes to the NAS, which stands
for Network-Attached Storage.
Network-attached storage is storage
that is attached to a computer or network,
more specifically, TCP/IP.
Example of the network-attached storage
are like Samba, NFS,
so any type of storage that you can access
through an IP address is considered NAS,
whether that storage has one drive or 10 drives,
it is given an IP address.
Just like any computer would have an IP address,
just like that, a storage would be given an IP address,
and then you will attach to that storage
by going through its IP address,
and that storage is called NAS.