Problem Solving

MediaVault 4440 User Manual

Frequently Asked Questions (FAQs)

TABLE 7-2.Frequently Asked Questions.

What is the proper placement of my

The MV 4440 can be operated in a tower configuration only.

MediaVault?

Whenever possible, do not place the unit near the floor, as it

 

will pick up more dust.

What are typical data-rate speeds?

The internal data rates per vPOD range anywhere from

 

500MB/sec to about 606MB/sec. Striping the four vPODs

 

together provides a sustained data rate of 1000MB/s.

 

 

What is striping?

Striping is a technique where different parts, called sectors, of

 

different disk drives are used alternately in sequence.

 

This is done for several possible reasons: a) Gaining

 

performance; b) Increasing reliability; or c) Increasing

 

capacity.

 

 

What is spanning/concatenation?

This is a technique where hard disk drives are used end-to-

 

end, i.e. where one fills up the data continues on to the next.

 

This is strictly done for capacity, and has no gains in either

 

speed or reliability.

 

 

What is mirroring?

Mirroring is where data, when written, is written to two differ-

 

ent disks or sets of disks -- i.e. the same copy in both places.

 

This offers reliability, at the cost of capacity and speed.

What is RAID 0?

In RAID 0, the disk drives are striped with corresponding

 

sectors of other drives, called strips, sequentially.

 

Data written goes to sector 1 of drive 1, then sector 1 of drive

 

2, and so on. RAID 0 sacrifices data protection to gain

 

capacity and performance.

 

To do RAID 0 requires a minimum of 2 disks. The MV 4440

 

has four sets of 10 2.5-inch disk drives.

 

 

What is RAID 5?

In RAID 5, the sectors of corresponding disk drives form what

 

is called a sector strip. One sector of this strip is used for

 

parity (this sector is alternated to different drives in each strip).

 

Parity is information used to read or recreate missing data in

 

the event that a drive fails.

7-4

MV 4440_Ciprico Inc.

Page 93
Image 93
Ciprico 4400 user manual Frequently Asked Questions FAQs