Fantec SQ-35RU3e User Manual
11
RAID 10/1 (mirroring):
If only two HDDs are present in slots 1 and 2, or 3 and 4 during setting RAID10 mode, then the
device creates one RAID1 from both HDDs.
RAID1 mode automatically creates a copy of all data and prevents data loss due to defect of a single
HDD.
Every data transfer is affected on both drives, which makes RAID1 mode the safest for critical data,
which under no circumstances are to be lost.
The actual useable storage capacity is half of the capacity of both HDDs combined (for identical
HDDs) or the capacity of the smaller HDD (for different HDDs).
If one HDD fails the functioning HDD is still useable, but the data are in a critical state until the
defective HDD is replaced.
After inserting the new HDD automatically a backup of all data on the sound HDD is affected and
redundancy is restored. During restoration the HDD is still useable, but the risk of complete data loss
is increased, since data redundancy is not yet completed.
Generally HDD access from PC during restoration is prioritized. However, this access increases the
restoration time and limits performance up to the time when restoration is completed.