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HP 353803-B22 HP StorageWorks 1000 Modular Smart Array installation guide (254 - Page 26

Striping methods, RAID levels, Table 4 RAID level comparison

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Striping methods A storage array combines the capacity of several physical hard drives into one virtual unit called an array. These arrays are then presented to the operating system as a single disk device. The physical layout of an array can be one of two configurations: • Vertical striping-Offers ultimate fault tolerance and performance, but at the price of storage efficiency. • Horizontal striping-Allows for the creation of large arrays and efficient use of storage capacity, but at the price of I/O performance and less fault tolerance. In a vertical configuration, an array uses hard drives from separate storage enclosures and different SCSI buses. In a horizontal configuration, the array uses multiple drives contained within the same storage enclosure. RAID levels In conjunction with the striping method, the assigned RAID level also determines the fault-tolerance, I/O performance, and storage efficiency of the LUN. See Table 4 below for a comparison list of the different RAID levels. When selecting a RAID level for a LUN, consider the type of data that will be stored on the array. For example: • For transitional data: you may want to use RAID 0, which provides no fault tolerance, but provides rapid storage and access of large amounts of data. • For critical data: use a fault-tolerant RAID level such as RAID 1, RAID 1+0, RAID 5, or RAID 6. Choose the RAID level that offers the desired combination of fault-tolerance, I/O performance, and storage efficiency. Depending on the assigned RAID level, one or more drives within a LUN can fail without bringing the drive sub-system down. Table 4 RAID level comparison RAID level RAID 0 RAID 1 RAID 1+0 RAID 5 Alternative name Data striping Drive mirroring Data striping plus drive mirroring I/O performance Highest High * Fault tolerance Storage efficiency None Highest Highest * Low Data striping, with one set of distributed parity data Medium Medium High 26 Installation procedures-All deployments

Section	Page
Contents	3
Intended audience	7
Prerequisites	8
Related documentation	8
Document conventions and symbols	9
Table 1 Document conventions	9
Equipment symbols	10
Rack stability	11
HP technical support	11
HP-authorized reseller	12
Helpful websites	12
Installation procedures-All deployments	13
Figure 1: Overview of MSA installation procedures	14
Step 1: Review and confirm your plans	15
Determine which version of MSA controller firmware to use	15
Table 2 Basic MSA firmware and configuration options	16
Complete the planning worksheet on the poster	17
Go to the Internet for the most recent MSA and SAN information	18
Table 3 MSA1000 and SAN-related websites	18
Review MSA installation best practices	21
Planning	21
Installation	21
Ongoing	24
Plan your storage configuration	25
System and performance expectations	25
Striping methods	26
RAID levels	26
Table 4 RAID level comparison	26
Hard drive sizes and types	27
Spare drives	27
Array sizing (capacity)	27
Step 2: Prepare your site	28
Provide adequate structural support for the floor	28
Provide adequate clearance space and ventilation	28
Provide adequate and redundant sources of power	28
Table 1: MSA1000 specifications	29
Step 3: Install MSA option kits	30
Step 4: Rack the MSA and the storage enclosures	31
Rack installation best practices	31
Step 5: Install the hard drives	36
Step 6: Prepare your servers	37
Step 7: Install the HBA in your servers	38
Step 8: Prepare your switches	39
Step 9: Connect the cables	40
Cabling best practices	40
Connecting the SCSI cables	42
Recommended SCSI cable connections	42
Figure 2 SCSI I/O modules, bus numbers, and box numbers	42
Connecting the MSA to SCSI storage enclosures	43
Figure 3 SCSI cable connections to two MSA30 SCSI storage enclosures	43
Connecting the Fibre Channel cables	44
Connecting Fibre Channel cables in a singlepath configuration	45
Figure 4 Sample Fibre Channel cable connections, singlepath configuration	45
Connecting Fibre Channel cables in a multipath configuration	46
Figure 5 Sample Fibre Channel cable connections, multipath configuration	46
Connecting the power cords	47
Table 5 Levels of protection against power failures	47
Figure 6 Connecting the power cords using two UPSs	49
Step 10: Power on the devices	50
Verify the operating status of the MSA	51
View the LEDs on the MSA	51
Table 6 MSA1000 startup status lights	51
Read the messages on the controller display panel	52
Table 7 MSA1000 startup messages	52
Verify the operating status of the storage enclosures	52
Verify the operating status of the Fibre Channel switches	53
Verify the operating status of the servers	53
Step 11: Configure your MSA	54
Obtain desired controller firmware and Support Software CD versions	54
Determine which storage configuration utility to use	55
About the MSA Command Line Interface	55
About the Array Configuration Utility	55
About the Array Configuration Utility Command Line Interface	56
Configure the MSA	57
Configuration procedures-Windows environments	59
Prerequisites	59
Installing MSA-specific components on the servers	60
Updating MSA controller firmware (if necessary)	62
Configuring the storage	63
Configuration procedures-Linux environments	65
Prerequisites	65
Installing MSA-specific components on the servers	66
Updating MSA controller firmware (if necessary)	68
Configuring the storage	69
Configuration procedures-HP-UX environments	71
Prerequisites	71
Additional HP-UX support notes	72
Table 8 HP-UX required updates for active/active	72
Installing the ACU-CLI on the servers (optional)	73
Updating MSA controller firmware (if necessary)	74
Configuring the storage	74
Configuration procedures-OpenVMS environments	77
Prerequisites	77
Obtaining World Wide Port Names	78
Installing the current Fibre_SCSI patch on the servers	79
Table 9 OpenVMS Fibre_SCSI patches (as of October 2006)	79
Updating MSA controller firmware (if necessary)	80
Configuring the storage	80
Assigning ID Numbers to the controllers and LUNs	81
Configuration procedures-VMware environments	83
Prerequisites	83
Updating MSA controller firmware (if necessary)	84
VMware-specific tasks	84
Configuring the storage	87
Configuration procedures-Other environments	89
Prerequisites	89
Operating system-specific notes	90
NetWare environments	90
Tru64 UNIX environments	91
SCO UNIX environments	91
Updating MSA controller firmware (if necessary)	92
Configuring the storage	92
Powering off and powering on the MSA	95
Powering off the MSA	95
Powering on the MSA	96
Regulatory notices	99
Regulatory Compliance identification numbers	99
Federal Communications Commission notice	99
Modifications	99
Cables	99
Canadian notice (Avis Canadien)	99
European Union notice	100
Japanese notice	100
Japanese power cord notice	100
BSMI notice	100
Laser compliance	101
Battery replacement notice	102
Disposal of waste equipment by users in private households in the European Union	102
Electrostatic discharge	103
Prevention methods	103
Grounding methods	103
Worksheets	105
Table 10 MSA1000 information	106
Table 11 External Fibre Channel interconnect device (switch) information	107
Table 12 Server information	108
Table 13 Hard drive information	112
Table 14 Array (LUN) information	116
Index	119
A	119
B	119
C	119
D	119
E	119
F	119
G	120
H	120
I	120
L	120
M	120
N	121
O	121
P	121
R	121
S	121
T	122
U	122
V	122

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Installation procedures—All deployments

Striping methods

A storage array combines the capacity of several physical hard drives into one virtual unit called an

array. These arrays are then presented to the operating system as a single disk device. The physical

layout of an array can be one of two configurations:

•

Vertical striping—Offers ultimate fault tolerance and performance, but at the price of storage

efficiency.

•

Horizontal striping—Allows for the creation of large arrays and efficient use of storage capacity,

but at the price of I/O performance and less fault tolerance.

In a vertical configuration, an array uses hard drives from separate storage enclosures and different

SCSI buses. In a horizontal configuration, the array uses multiple drives contained within the same

storage enclosure.

RAID levels

In conjunction with the striping method, the assigned RAID level also determines the fault-tolerance,

I/O performance, and storage efficiency of the LUN.

See

Table 4

below for a comparison list of the different RAID levels.

When selecting a RAID level for a LUN, consider the type of data that will be stored on the array.

For example:

•

For transitional data: you may want to use RAID 0, which provides no fault tolerance, but

provides rapid storage and access of large amounts of data.

•

For critical data: use a fault-tolerant RAID level such as RAID 1, RAID 1+0, RAID 5, or RAID 6.

Choose the RAID level that offers the desired combination of fault-tolerance, I/O performance,

and storage efficiency.

Depending on the assigned RAID level, one or more drives within a LUN can fail without bringing

the drive sub-system down.

Table 4

RAID level comparison

RAID level

Alternative name

I/O

performance

Fault tolerance

Storage

efficiency

RAID 0

Data striping

Highest

None

Highest

RAID 1

RAID 1+0

Drive mirroring

Data striping plus drive mirroring

High *

Highest *

Low

RAID 5

Data striping, with one set of

distributed parity data

Medium

High