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What is RAID?
What RAID policy does SURETE support?
Can I use RAID 1 and RAID 5 in SURETE concurrently?
Generally RAID systems use either the hardware RAID controller or the software-only RAID system. Which one is used by
SURETE?
While creating RAID, must the hard disk drives installed in SURETE be of the same brand and size?
Should the hard disk drives be connected onto the same IDE channel while creating a RAID device?
Can a "3-drive RAID-5" be dynamically be expanded to "4-drive RAID-5" without losing the existing data?
Will the data stored in the non-RAID drive be lost when I include this drive into a new created RAID device?
When trying to build a RAID group in SURETE, why I do not see any available hard disk drive in the "Config RAID" page?
How about the performance difference will be observed between non-RAID and RAID device?
Should more memory be installed onto SURETE when RAID groups are used?
Can I adjust the "strip size" in the RAID 0 or 5 groups of SURETE?
Is "Hot Swap" function supported by SURETE?
Is "Hot Spare" function supported by SURETE?
Can you explain "global Hot Spare" briefly?
What is the "Hot Expansion" function? On what occasions can it be used?
What will happen if there is a power loss while writing data to SURETE?
What will happen to the existing RAID groups at a restart that had a power loss in the rebuilding state?
What is RAID?
RAID stands for Redundant Array of Independent Disks, a subsystem that increases performance and/or provides fault tolerance.
For instance, when the hard disk's data is corrupted or destroyed, RAID can provide a safeguard function to protect the data's
accuracy.
What RAID policy does SURETE support?
SURETE supports three RAID policies:
RAID 0: Stripe/Span. (2 ~ 8 hard disk drives). It interleaves data across multiple disks for better performance. Safeguard
function is not provided in RAID 0.
RAID 1: Mirror. (multiplication of 2 hard disk drives). It provides 100% duplication of data into paired hard disks. This offers the
highest reliability, but doubles the storage cost.
RAID 5: Striped with Rotating Parity (3 ~ 8 hard disk drives). Data is striped across three or more drives. Parity bits are used for
fault tolerance.
Can I use RAID 1 and RAID 5 in SURETE concurrently?
Yes. SURETE provides the independent RAID group, which means you can group several different RAID group at the same time in
SURETE.
Generally RAID systems use either the hardware RAID controller or the software-only RAID system. Which one is
used by SURETE?
SURETE utilizes an innovative method of RAID management. It is a hardware and software integrated solution, using a patent-
pending technology for RAID management and access. This solution can provide more storage capacity while maintaining the
RAID performance and improving RAID functionalities.
While creating RAID, must the hard disk drives installed in SURETE be of the same brand and size?
Theoretically, the answer is negative. But for the performance concerns, the same brand drives will have the similar
characteristics; it will help to maintain the overall performance especially on exchanging data.
To have an optimized capacity of a RAID group, the similar size (or even same size) hard disk drives will be recommended. For
example, if you use one 10GB hard drive and a 60GB hard drive to create RAID 1, only 10GB will be the available storage space
instead of 60GB. If you use two 60GB hard drives to create RAID 1 group, the available storage space will be 60GB. Performance
wise, this is also a fact, the similar capacity hard drives will mostly have the identical RPM speed. If the RPM of hard drives is
different with each other, they will interfere each other and affect the overall performance a lot.
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