0+1
==Characteristics & Advantages==
RAID 0+1 is implemented as a mirrored array whose segments are RAID 0 arrays
RAID 0+1 has the same fault tolerance as RAID level 5
RAID 0+1 has the same overhead for fault-tolerance as mirroring alone
High I/O rates are achieved thanks to multiple stripe segments
Excellent solution for sites that need high performance but are not concerned with achieving maximum reliability
==Disadvantages==
RAID 0+1 is NOT to be confused with RAID 10. A single drive failure will cause the whole array to become, in essence, a RAID Level 0 array
Very expensive / High overhead
All drives must move in parallel to proper track lowering sustained performance
Very limited scalability at a very high inherent cost
10
==Characteristics & Advantages==
RAID 10 is implemented as a striped array whose segments are RAID 1 arrays
RAID 10 has the same fault tolerance as RAID level 1
RAID 10 has the same overhead for fault-tolerance as mirroring alone
High I/O rates are achieved by striping RAID 1 segments
Under certain circumstances, RAID 10 array can sustain multiple simultaneous drive failures
Excellent solution for sites that would have otherwise gone with RAID 1 but need some additional performance boost
==Disadvantages==
Very expensive / High overhead
All drives must move in parallel to proper track lowering sustained performance
Very limited scalability at a very high inherent cos
это взято
отсюда
Для тех кому интересно, рекомедую прочитать эту "paper"
"A Case for Redundant Arrays of Inexpensive Disks (RAID)", Technical Report CS-TR-057-86, Princeton, November 1986. 33 D. Patterson, G. Gibson,
and R. Katz. (неважная копия, но другой нет)
и еще много всяких бумаг лежит тут
ftp://ftp.cs.berkeley.edu/pub/raid/papers/
