Marco 10-1

#！ /bin/bash

#

Cat <<eof

d| D) Show disk usages

m| M) Show memory usages

s| S) Show swap usages

*) quit

Eof

Read-p "Your Choice:" Choice

while [$CHOICE! = ' quit '];d o

Case $CHOICE in

d| D

echo "Disk usage:"

DF-PH;;

m| M

echo "Memory usage:"

Free-m |grep "Mem";;

s| S

echo "Swap usage:"

Free-m |grep "Swap";;

*)

echo "Unknown ..."

Exit 9;;

Esac

Read-p "Again, Yourchoice:" CHOICE

Done

Raid:

Level: only means the disk organization is different, there is no subordinate points

0: Strip

Performance improvement: Read/write

Redundancy capability (fault tolerance): none

Space utilization: NS

At least two plates.

1. Mirror

Performance: Write feature down, read performance improvement

Redundancy capability: Available

Space utilization: 1/2

At least 2 pieces of disk

5.

Improved reading and writing skills

Yes

(n-1)/n

At least 3 pieces of disk

10.

Improved reading and writing skills

Yes

1/2

At least 4 plates required

01.

Improved reading and writing skills

Yes

1/2

At least 4 plates required

30h

Improved reading and writing skills

Yes

(n-2)/n

At least 6 plates required

Jbod

No

No

1

At least 2 plates required

Marco 10-1