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Problem Solving MediaVault 4440 User Manual
7-4
MV 4440_Ciprico Inc.
Frequently Asked Questions (FAQs)
TABLE 7-2. Frequently Asked Questions.
What is the proper placement of my
MediaVault?
The MV 4440 can be operated in a tower configuration only.
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.