HP P2000 G3 Reference Guide

HP StorageWorks P2000 G3 MSA System SMU Reference Guide 31
Network operating system, databases, high availability applications, workgroup servers 5
Very large databases, web server, video on demand 50
Mission-critical environments that demand high availability and use large sequential workloads 6
Table 5 RAID level comparison
RAID
level
Min.
disks
Description Strengths Weaknesses
NRAID 1 Non-RAID, nonstriped
mapping to a single disk
Ability to use a single disk to store
additional data
Not protected, lower performance
(not striped)
0 2 Data striping without
redundancy
Highest performance No data protection: if one disk
fails all data is lost
1 2 Disk mirroring Very high performance and data
protection; minimal penalty on
write performance; protects
against single disk failure
High redundancy cost overhead:
because all data is duplicated,
twice the storage capacity is
required
3 3 Block-level data striping
with dedicated parity
disk
Excellent performance for large,
sequential data requests (fast
read); protects against single disk
failure
Not well-suited for
transaction-oriented network
applications: single parity disk
does not support multiple,
concurrent write requests
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; protects
against single disk failure
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; 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
10
(1+ 0)
4Stripes data across
multiple RAID-1
sub-vdisks
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
50
(5+0)
6Stripes 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; protects against
multiple disk failures
Lower storage capacity than RAID
5
Table 4 Example applications and RAID levels
Application RAID level

HP P2000 G3 Specifications

General

Model	P2000 G3
Category	Storage
Drive Support	SAS, SATA
Host Interface	iSCSI, Fibre Channel, SAS
Form Factor	2U
RAID Levels	0, 1, 5, 6, 10
Cache	2 GB
Drive Bays	12 (SFF), 24 (SFF), 12 (LFF)
Cache Memory	2GB per controller
Operating Temperature	10°C to 35°C
Power Supply	Redundant
Expansion Options	Disk Enclosures