User manual

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Web Configuration
RAID 5:
RAID 5 (Striping with distributed parity)
combines three or more disks in a way
that protects data against loss of any
one disk. The storage capacity of the
array is reduced by one disk. The
PowerBay NAS array implements
RAID 5 in one of two ways:
1) Select “RAID 5” to build a 4-disk
array. Available capacity will be equal
to that of three disk cartridges.
2) Select “RAID 5 with Spare” to build
a 3-disk array. The fourth disk is used
as a spare. The spare drive will auto-
matically rebuild to complete a healthy
3-disk array whenever a failure of one
of the other three drives is detected.
Available capacity is equal to that of
two disk cartridges.
RAID 6:
RAID 6 (Striping with distributed dual parity) combines all four disks in a way that
protects data against loss of any two disks. In the event of a
single disk failure, the use of dual parity allows for time to rebuild the array safely
without the data being at risk if an additional drive fails before
the rebuild is complete. Available capacity is equal to that of two disk cartridges.
Array Mirroring to eSATA Drive
The full data of the PowerBay NAS array can be continuously copied to an attached
eSATA drive. If a catastrophic failure of the NAS array occurs, the full data can be
restored from the eSATA drive once the NAS array has been repaired or replaced.
Array mirroring to eSATA is supported only in RAID modes 0, 5, and 6 and is NOT
supported in RAID 1 with Spare or in RAID 5 with Spare. The capacity of the eSATA
drive must be at least as large as the capacity of the NAS array.
If you want to use this function, please enable it during the first time you configure
the array.
When the mirror function is in use, the Disk Configuration page will show the sta-
tus of the mirror system and will present action buttons to temporarily disable the
mirror function (“Unmirror” Button) and to restore data from the eSATA drive to the
NAS (“Restore” Button).
Product
Overview
Installation
Web
Configuration
Knowledge
Base