1. Primary & Secondary
Storage Technologies:
R.A.I.D & S.A.N
Presented by: Eissa Abdullah AL-
Owayied
Instructor: Muhammad AL-Jawarneh

2. Types of Storage.
There are 5 types of storage, we will
focus on these 2:
 Primary Storage
 Secondary Storage

3. What Is Primary Storage?.
Component in the computer that stores
information for a short time.
Also, It’s the only one directly accessible to the
CPU.
e.g.: SAN, Processor Cache & Register, Floppy
disks, RAM.

4. What Is Secondary Storage?.
All data storage that is not currently in a
computer's primary storage or memory.
An additional synonym is external
storage.
e.g.: RAID, Flash Memory (USB Flash
Drives), Floppy disks, Magnetic Tape

5. We Will focus more on these following
storage devices:
 R.A.I.D
 S.A.N

6. What is R.A.I.D?.
R.A.I.D is an acronym for “Redundant
Array of Inexpensive Disk”.
‫المستقلة‬ ‫لألقراص‬ ‫التعدد‬ ‫مصفوفة‬
R.A.I.D is a Secondary Storage device.
It Turns multiple “Physical” Hard
Drives, into single “Logical” Drive.

7. Logical
Physical

8. What you see
What is really
there

9. Anything else?...
R.A.I.D Can do a lot of good things, but
also has a lot of problems.
There are many types of R.A.I.D,
Starting from “R.A.I.D 0”, ending
somewhere between “R.A.I.D 10-14”.

10. Types of R.A.I.D
As been said recently. There are many
types of R.A.I.D, but we will focus on
what mostly used and what you
normally see in the present day:
 R.A.I.D 0
 R.A.I.D 1
 R.A.I.D 5

11. What is R.A.I.D “0”?.
Also known as “Disk Striping”.
It allows to combine multiple Hard
Drives of same size, into one
extremely big disk, between 2-32.

12. +++256 MB256 MB 256 MB 256 MB
1024 GB

13. Recording and Reading an Image:
Striping

14. What is Good?.
 It makes Hard Drive easy to pullout
information, and record it.
What is Bad?.
 If one Hard Drive fails, All data lost or
destroyed .
(No Redundancy)

15. What is R.A.I.D “1”?.
Also known as “Disk Mirroring”.
It makes 2 Hard Drive mirror images.
What on the first Hard Drive, is on the
second Hard Drive.

16. Recording an Image:
Disk 1
Disk 2

17. What is Good?.
 If one Hard Drive fails, your computer/server stays
up and running.
 We can replace the failed Hard drive with new one
and it mirror the new Hard Drive and digitally
“Rebuilding Array”.
(Hot Swappable)
What is Bad?.
 There’s no extra space giv
-en, it only does mirroring.
 It has normal Hard Drive speed, sometimes faster,
sometimes slower.

18. What is Good?.
 If one Hard Drive fails, your computer/server stays
up and running.
 We can replace the failed Hard drive with new one
and it mirror the new Hard Drive and digitally
“Rebuilding Array”.
(Hot Swappable)
What is Bad?.
 There’s no extra space giv
-en, it only does mirroring.
 It has normal Hard Drive speed, sometimes faster,
sometimes slower.

19. What is R.A.I.D “5”?.
Also known as “Disk Striping with parity”.
Same as R.A.I.D, but it uses additional
Hard Disk for redundancy.
It duplicate data for all Hard Drives,
between 3-32.

20. Recording and Reading an Image:
Striping
with parity
Duplicated
data

21. What is Good?.
 If one Hard Drive fails, your computer/server stays
up and running.
 We can replace the failed Hard drive with new one
and it mirror the new Hard Drive and digitally
“Rebuilding Array”.
(Hot Swappable)
What is may be Bad?.
 Not all the Hard Disk size are usable, because it uses
one Hard Disk for redundancy.

22. S.A.N
(Storage Area Network)

23. What is S.A.N?.
 S.A.N is a acronym for “Storage Area
Network”.
‫التخزين‬ ‫شبكة‬
 S.A.N is a Primary Storage dedicated
network of boxes to store data. It
stores data for your infrastructure.