MicroNet PlatinumRAID Ultra320, Руководство пользователя

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PlatinumRAID Owner’s Manual
0
RAID
Level Description Min.
Drives Max.
Drives Capacity Data
Reliability
Data
Transfer Rate I/O
Request Rates
0 Also known as striping
Data distributed across multiple drives
in the array. There is no data protection 1 5 ( N )
Disks
No data
Protection Very High Very High for
Both Reads and Writes
1 Also known as mirroring
All data replicated on N
Separated disks. N is almost always 2.
This is a high availability
Solution, but due to the 100% duplica-
tion, it is also a costly solution. 2 2 1 Disk Higher than
RAID 3,5 Reads are higher
Than a single disk;
Writes similar to a single
disk
Reads are twice faster than
a single disk;
Write are similar to a single
disk.
0+1 Also known as Block-Interleaved Parity.
Data and parity information is subdi-
vided and distributed across all disk.
Parity must be the equal to the smallest
disk capacity in the array. Parity infor-
mation normally stored on a dedicated
parity disk. 3 5 ( N / 2 )
Disks Higher than
RAID 3,5 Transfer rates more similar
to RAID 1 than RAID 0 Reads are twice faster than
a single disk;
Writes are similar to a sin-
gle disk.
3 Also known as Bit-Interleaved Parity.
Data and parity information is subdi-
vided and distributed across all disk.
Parity must be the equal to the smallest
disk capacity in the array. Parity infor-
mation normally stored on a dedicated
parity disk. 3 5 ( N - 1 )
Disks Lower than RAID 1, 10
Higher than a single drive
Reads are similar to
RAID 0;
Writes are slower than a
single disk
Reads are approximately
twice as fast as a single
disk;
Writes are similar to a sin-
gle disk.
5 Also known Block-Interleaved
Distributed Parity.
Data and parity information is subdi-
vided and distributed across all disk.
Parity must be the equal to the smallest
disk capacity in the array. Parity infor-
mation normally stored on a dedicated
parity disk.
3 5 ( N - 1 )
Disks Lower than RAID 1, 10
Higher than a single drive
Reads are similar to
RAID 0;
Writes are slower than a
single disk
Reads are similar to
RAID 0;
Writes are slower than a
single disk.
Appendix B: RAID Level Comparison Table
B-RAID Level Comparison Table