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HighPoint RocketRAID 2711 インストレーション・マニュアル
 
Part   1   –   W hat   i s   a   D ata   R AID?  
A   D ata   R AID   i s   s etting   u p   a   R AID   a rray   ( 0,   1 ,   5 ,   6 ,   1 0   o r   J BOD)   o n   t he   R ocketRAID   2 711   s eries  
controller.    
   
RAID   a rrays   o ffers   a dvantages   o f   p erformance   a nd   p rotection   w ith   r edundancy.
RAID   B asics?    
RAID   s tands   f or   R edundant   A rray   o f   I ndependent   D rives.   T his   m eans   t aking   m ultiple   m atching   d rives  
and   a rranging   t hem   t ogether   t o   a chieve   l arge   s torage   s pace,   s peed,   d ata   p rotection,   o r   a ny  
combination   o f   t he   t hree.   T he   R ocketRAID   2 711   s eries   c ontroller   s upports   t he   f ollowing   R AID   t ypes:  
RAID   0   " Stripe"  
Speed:   D ata   i s   a lternated   a cross   t wo   o r   m ore   d rives   t o   g ain   s peed   b y   e ssentially   d istributing   t he  
workload.
  
Protection:   N o   b uilt-­‐in   p rotection.  
Capacity:   U sable   s pace   i s   t he   c ombined   c apacity   o f   a ll   t he   d rives.  
 
RAID   1   " Mirror"  
Speed:   N o   s peed   b enefits   g ained.   
  
Protection:   O ne   d rive   c an   f ail   a nd   a ll   d ata   w ill   s till   b e   a ccessible.    
Capacity:   O ne   d rive   w orth   o f   u sable   s pace   o ut   o f   t he   t wo   t otal   d rives   u sed.  
 
JBOD   ( Independent   D rive   M odes)  
Speed:   N o   s ignificant   s peed   g ains.   
  
Protection:   N o   b uilt-­‐in   d ata   p rotection.   
  
Capacity:   I n   J BOD   m ode,   t he   c apacities   a re   c ombined.   W hen   s et   u p   a s   i ndependent   d rives,   e ach   d rive  
presents   i ts   s tated   c apacity   f or   u se.  
 
RAID   5   " Stripe   &   P rotection"  
Speed:   D ata   i s   s triped   l ike   i n   a   R AID   0 ,   s o   s ignificant   s peed   g ains   a re   s een.   
  
Protection:   U tilizes   m athematical   p arity   t o   a chieve   d ata   p rotection   w hile   t aking   u p   a   m inimum   o f  
space.   O ne   d rive   c an   f ail   a nd   a ll   d ata   w ill   s till   b e   a ccessible.  
Capacity:   A ll   b ut   o ne   d rive   w orth   o f   c apacity   i s   u sable.   M inimum   t hree   d rives   a re   n eeded   t o   c reate   a  
RAID   5   a rray.   I n   a   t hree   d rive   R AID   5   a rray,   t here   i s   t wo   d rives   w orth   o f   u sable   s pace.  
 
RAID   6   " Stripe   &   D ouble   P rotection"  
Speed:   D ata   i s   s triped   l ike   i n   a   R AID   0 ,   s o   s ignificant   s peed   g ains   a re   s een.   
  
Protection:   U tilizes   m athematical   d ual   p arity   t o   a chieve   d ata   p rotection   w hile   t aking   u p   a   m inimum  
of   s pace.   T wo   d rives   c an   f ail   a nd   a ll   d ata   w ill   s till   b e   a ccessible.