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Hydra LAN
3.6.2 RAID Setting
In this section you can manage the RAID array and set up your drives. The Hydra LAN
supports JBOD, RAID 0, RAID 1 and RAID 5. Except for JBOD, hard drives of identical
capacities are recommended.
• RAID 0: Striping is used where speed is the primary objective but this system is not
redundant. The fragments are written to their respective disks simultaneously on the
same sector. RAID 0 does not implement error checking so any error is unrecoverable.
More disks in the array means higher bandwidth, but greater risk of data loss.since data
is written without any form of parity data-checking.
• RAID 1: This mode is available when only 2 drives are installed. A RAID 1 array creates
an exact copy (or mirror) of a set of data on the second drive. This is useful when
reliability and backup are more important than storage space. The available capacity to
the user will only be as large as a single drive but when one of the hard drives fails, it
can be replaced and the data rebuilt.
• RAID 5: This mode is available when 3 or 4 drives are installed. Distributed parity
requires all drives but one to be present to operate. Drive failure requires replacement,
but the array is not destroyed by a single drive failure. The array will have data loss in
the event of a second drive failure and is vulnerable until the data that was on the failed
drive is rebuilt onto a replacement drive. Use this when reliability is most important.
• JBOD: Spanning is used to combine two or more hard drives of different capacities and
create one large volume. JBOD does not provide data redundancy.
Note: Creating the RAID system will take a while, depending on the drive capacity. Do not
turn off the power or interrupt the system in any other way during this process! We
recommend using the EXT2 file system for optimum performance and functionality.
Note: Changing the RAID setup will require you to re-format the drives. Make sure you
backup all data before doing so!
Page 29 / Chapter 3 - Web Configuration
User Guide
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