EX-3455 Backup System SATA2 RAID 0/1
Seite 6
3.3 Einbau in einen PCI-Express Slot
Um die EX-3455 in einen PCI-Express-Bus einzubauen müssen sie vorher die Platine mit den vier
Schrauben aus dem 3.5“ Einschub entfernen.
Lösen sie die vier Schrauben
Befestigen sie jetzt mit zwei Schrauben den mitgelieferten Bügel (Normale Höhe oder Low Profile).
Befestigung der Schrauben
Setzen sie jetzt die EX-3455 in einen freien PCI-Express-Slot ein. Das Power Kabel muss jetzt
nicht mehr an das PC-Netzteil angeschlossen werden. Der benötigte Strom wird über den PCI-
Express Slot geliefert.
EX-3455
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Backup System SATA2 RAID 0/1 EX-3455
Seite 19
5. Information about the RAID Mode
5.1 Striping Mode (RAID 0)
RAID0 (block-level striping without parity or mirroring) provides improved
performance and additional storage but no redundancy or fault tolerance
(making it not true RAID, according to the acronym's definition). However,
because of the similarities to RAID (especially the need for a controller to
distribute data across multiple disks), simple stripe sets are normally
referred to as RAID 0. Any disk failure destroys the array, and the likeli-
hood of failure increases with more disks in the array (at a minimum,
catastrophic data loss is twice as likely compared to single drives without
RAID). A single disk failure destroys the entire array because when data
is written to a RAID 0 volume, the data is broken into fragments called
blocks. The number of blocks is dictated by the stripe size, which is a
configuration parameter of the array. The blocks are written to their re-
spective disks simultaneously on the same sector. This allows smaller
sections of the entire chunk of data to be read off the drive in parallel,
increasing bandwidth. RAID 0 does not implement error checking, so any error is uncorrectable.
More disks in the array means higher bandwidth, but greater risk of data loss
5.2 Mirroring (RAID 1)
In RAID1 (mirroring without parity or striping), data is written identically to
multiple disks (a "mirrored set"). Although many implementations create
sets of 2 disks, sets may contain 3 or more disks. Array provides fault
tolerance from disk errors or failures and continues to operate as long as
at least one drive in the mirrored set is functioning. Increased read per-
formance occurs when using a multi-threaded operating system that sup-
ports split seeks, as well as a very small performance reduction when
writing. Using RAID 1 with a separate controller for each disk is sometimes
calledduplexing.
1 2 3 4
ON
1 2 3 4
ON
Switch
Pin#
Switch
Positions
Description
1,2,3
RAID 0 Mode (RAID 0 LED is on)
M0 and M1 are set in the RAID 0 (striping) mode, please note both M0
and M1 will be treated as blank disks, all data on the disks will be
erased to generate a new RAID 0 disk array.
EZ-RAID 1 Mode (EZ-RAID 1 LED is on), Factory Default
M0 (Source Drive) and M1 (Destination Drive) are set in the RAID 1
(mirroring) mode, and the M0 data will be copied (in sector level) to M1
automatically. Since the M1 disk will be overwritten by the M0 disk,
please make sure the connection of M0 and M1 is correct.
(10 paginas)
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