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Table 3. HP MSA 1040/2040 RAID levels (Continued)

RAID

level

inimum

disks

Allowable

disks

Description Strengths Weaknesses

6 4 16 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; protects

against dual disk failure

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

(1+0)

4 16

Stripes data

across

multiple

RAID 1 sub-

Disk

Groups

Highest performance and

data

protection (protects

against

multiple disk failures)

High redundancy cost

overhead:

because all

data is duplicated, twice

the

storage capacity is

required; requires

minimum of four disks

(5+0)

6 32 Stripes data

across

multiple

RAID

5 sub-Disk

Groups

Better random read and write

performance and data protection

than RAID 5; supports more disks

than RAID 5; protects against

multiple disk failures

Lower storage capacity

than RAID 5

Note

RAID types NRAID, RAID 0 and RAID 3 can only be created using the Command Line Interface (CLI) and are not available in the

SMU. When using Virtual Storage, only non-fault tolerant RAID types can be used in the Performance, Standard, and Archive

and Tiers. NRAID and RAID 0 are used with Read Cache as the data in the Read Cache SSDs is duplicated on either the

Standard or Archive Tier.

Volume mapping

For increased performance, access the volumes from the ports on the controller that owns the Disk Group, which would be

the preferred path. Accessing the volume on the non-preferred path results in a slight performance degradation.

Optimum performance with MPIO can be achieved with volumes mapped to multiple paths on both controllers. When the

appropriate MPIO drivers are installed on the host, only the preferred (optimized) paths will be used. The non-optimized

paths will be reserved for failover.

Best practices for SSDs

SSDs are supported in the MSA 2040 system only. The performance capabilities of SSDs are a great alternative to traditional

spinning hard disk drives (HDD) in highly random workloads. SSDs cost more in terms of dollars per GB throughput than

spinning hard drives; however, SSDs cost much less in terms of dollars per IOP. Keep this in mind when choosing the

numbers of SSDs per MSA 2040 array.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 31 32 33

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Mpio HD 200 Guide d'installation Page 25

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