Hardware Installation
PixelStor 5000 User Manual
Rev. 1, May 2013
performance and the best fault-tolerance in a multi-user system. 100% redundancy of
data means no rebuild is necessary in case of a disk failure, just a copy to the
replacement disk. Also, under certain circumstances, RAID 1 can sustain multiple
simultaneous drive failures.
Cons - highest disk overhead of all RAID types (100%).
Ideal applications - those that require very high availability.
RAID 5 - Distributed Parity - RAID-5 stores parity information but not redundant data.
The parity information can be used to reconstruct data. RAID-5 requires at least three
disks for the array.
Pros - This is the best combination of performance and cost.
Cons – Disk failure has some impact on throughput.
Ideal Applications - this is the most versatile RAID level and is applicable to a broad
range of applications. It is best for multi-user systems in which performance is not
critical or applications that require few write operations.
RAID 6 – Block-level striping with dual distributed parity – Like RAID 5, RAID 6 stripes
data and parity across an array of drives with the additional capability to calculate two
sets of data parity for each volume of data. Requires at least 4 disks for the array.
Pros - Extremely high data fault tolerance. Provides protection against double disk
failures and failures while a single disk is rebuilding while other RAID levels can handle
at most one fault.
Cons – RAID 6 performance can be slightly worse than RAID 5 in terms of writes due to
the added overhead of more parity calculations. RAID 6 is inefficient when used with a
small number of drives due to need for 2 parity drives.
Ideal Applications – Complex, higher capacity SATA arrays (12-24 drives) where higher
availability is critical.
RAID 10 - Combination of mirroring and striping - This type offers an array of stripes in
which each stripe is a RAID-1 array of drives.
Pros -This offers higher performance than RAID-1
Cons- but at much higher cost.
Ideal Applications- those requiring high performance and fault tolerance.
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