HP MSA2312sa HP StorageWorks 2000 G2 Modular Smart Array reference guide (5009 - Page 24

RAID level, Expansion capability, Maximum disks, level, disks, Description, Strengths, Weaknesses

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Table 5 RAID level comparison (continued) RAID level 5 6 10 (1+0) 50 (5+0) Min. Description disks 3 Block-level data striping with distributed parity 4 Block-level data striping with double distributed parity 4 Stripes data across multiple RAID-1 sub-vdisks 6 Stripes data across multiple RAID-5 sub-vdisks Strengths Weaknesses Best cost/performance for transaction-oriented networks; very high performance and data protection; supports multiple simultaneous reads and writes; can also be optimized for large, sequential requests Write performance is slower than RAID 0 or RAID 1 Best suited for large sequential workloads; non-sequential read and sequential read/write performance is comparable to RAID 5 Higher redundancy cost than RAID 5 because the parity overhead is twice that of RAID 5; not well-suited for transaction-oriented network applications; non-sequential write performance is slower than RAID 5 Highest performance and data protection (can tolerate multiple disk failures) High redundancy cost overhead: because all data is duplicated, twice the storage capacity is required; requires minimum of four disks Better random read and write performance and data protection than RAID 5; supports more disks than RAID 5 Lower storage capacity than RAID 5 Table 6 Vdisk expansion by RAID level RAID level Expansion capability Maximum disks NRAID Cannot expand. 1 0, 3, 5, 6 You can add 1-4 disks at a time. 16 1 Cannot expand. 2 10 You can add 2 or 4 disks at a time. 16 50 You can add one sub-vdisk at a time. The added sub-vdisk must contain the same 32 number of disks as each of the existing sub-vdisks. 24 Getting started

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24
Getting started
5
3
Block-level data striping
with distributed parity
Best cost/performance for
transaction-oriented networks;
very high performance and data
protection; supports multiple
simultaneous reads and writes;
can also be optimized for large,
sequential requests
Write performance is slower than
RAID 0 or RAID 1
6
4
Block-level data striping
with double distributed
parity
Best suited for large sequential
workloads; non-sequential read
and sequential read/write
performance is comparable to
RAID 5
Higher redundancy cost than
RAID 5 because the parity
overhead is twice that of RAID 5;
not well-suited for
transaction-oriented network
applications; non-sequential write
performance is slower than RAID
5
10
(1+0)
4
Stripes data across
multiple RAID-1
sub-vdisks
Highest performance and data
protection (can tolerate multiple
disk failures)
High redundancy cost overhead:
because all data is duplicated,
twice the storage capacity is
required; requires minimum of four
disks
50
(5+0)
6
Stripes data across
multiple RAID-5
sub-vdisks
Better random read and write
performance and data protection
than RAID 5; supports more disks
than RAID 5
Lower storage capacity than RAID
5
Table 6
Vdisk expansion by RAID level
RAID level
Expansion capability
Maximum disks
NRAID
Cannot expand.
1
0, 3, 5, 6
You can add 1–4 disks at a time.
16
1
Cannot expand.
2
10
You can add 2 or 4 disks at a time.
16
50
You can add one sub-vdisk at a time. The added sub-vdisk must contain the same
number of disks as each of the existing sub-vdisks.
32
Table 5
RAID level comparison (continued)
RAID
level
Min.
disks
Description
Strengths
Weaknesses