Sun Storage J4500 Array Service Manual

Sun Storage J4500 Array Service Manual

C H A P T E R

2

Configuring and Powering On the

Sun Storage J4500 Array

This chapter contains the following procedures and information:

Section 2.1 “Configuration and Cabling” on page 2-1

Section 2.1.1 “Terms and Definitions” on page 2-1

Section 2.1.2 “Configuration Rules” on page 2-2

Section 2.1.3 “Cabling the SAS Connectors” on page 2-5

Section 2.1.4 “Example Configurations” on page 2-7

Section 2.2 “Powering On and Off the Array” on page 2-11

2.1

2.1.1

Configuration and Cabling

The J4500 array can be connected to a supported HBA (Host Bus Adapter) installed in a server. The rules for connecting J4500 array are described here.

Terms and Definitions

There are several terms used in this document that you will need to become familiar with to better understand J4500 array configuration options.

2-1

2.1.2

TABLE 2-1

Term

HBA

SAS target

SAS fabric

Single path configuration

Multipath configuration

Zoning

Sun Storage J4500 Array Configuration Terms and Definitions

Daisy-chaining

(or cascading)

Definition

Host bus adapter (also called an initiator) is disk controlling circuity embedded on a motherboard, or an optional expansion card used to control a set of disks. Some HBAs support hardware RAID (Redundant

Array of Independent Disks), which is configured by the HBA software and provides redundancy in the event of a disk failure.

A device containing logical units and target ports that receives requests from, and responds to, an initiator. An example of a target device is a hard disk. Other terms used to describe a SAS target are “device” and “end device.” In multipath configurations, each hard disk is seen by the HBA as two targets.

A SAS fabric is conceptually similar to a network segment. A SAS fabric is made up of an initiator, targets, and a set of linked expanders that work like network switches linking end point devices (intitiators and targets) together as a discreet storage system. The J4500 array uses a dual fabric scheme with a primary SAS fabric “A” and a secondary, redundant SAS fabric “B”. A fabric can be expanded by daisy-chaining additional J4500 arrays. There are two 4-lane (or x4) connector ports (Port 0 and Port 1) per fabric. Each connector port links to all 48 disks.

This is a single path connection from a host to a one of the enclosure’s SAS fabrics (A or B). No path redundancy is available.

This is a dual path connection from a host to both of the array’s SAS fabrics (A and B). Provides two paths to the array’s disks and uses the redundant SAS fabric capability of the array for failover.

A method for linking several J4500 arrays together to increase the amount of available disks to the host. When cascading multiple arrays using a multipath configuration, Sun recommends cascading the host links in opposite directions from the edge of the SAS fabrics to prevent a single array failure from preventing access to other arrays in the cascade.

Zoning is a configuration method that takes the available connected storage and allows each host to have its own storage resources. Zoning is done on a per hard disk level and hard disks owned by one host cannot be accessed by other hosts. Sun Common Array Manager (CAM) version

6.4.1 software is required to perform host initiator-to-disk access configuration (zoning).

Configuration Rules

Before attaching cables to the J4500 array, read through the following configuration rules:

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2.1.2.1

General Rules

The array enclosure drive bays must be fully populated. All 48 SATA hard disk drives must be present and the same size. Do not mix drive capacities in the array enclosure; however you could, for example, have one J4500 populated with 750

GB SATA drives and a daisy-chained J4500 array with 1 TB SATA drives. The

J4500 array does not support SAS drives.

The mini-SAS connector ports are configured as follows: Port 0 uses subtractive or direct routing (indicated by the circle icon above the connector, see

FIGURE 2-1

) and connects to upstream devices (either an HBA, or an upstream J4500 array). Port 1 is universal (indicated by the diamond and circle icons), using table and direct routing, and connects to either an upstream HBA or a downstream J4500 array.

Use only supported mini-SAS x4 cables (SFF-8088). There are two cables included with the array. Refer to

Section 3.1 “Options and Replaceable Components” on page 3-1

for additional cable options. Maximum cable lengths between devices is 6 meters. Using non-Sun certified cables or longer cables is not supported.

Do not cross connect an array enclosure’s SAS fabrics. The SAS A ports of an

array enclosure must not be cross connected to its SAS B ports

.

Caution –

Cross connecting the SAS fabrics of a J4500 array (connecting its SAS A ports to its SAS B ports) can cause the HBA to be unable to properly identify or access drives in the array which could lead to data loss.

2.1.2.2

Connecting Host Bus Adapters (HBAs)

HBAs can be connected as follows:

Use only supported HBAs with the array. At initial release, supported HBAs for use with your array product are:

Sun StorageTek SAS RAID Eight-Port, External HBA (SG-XPCIESAS-R-EXT-Z,

Adaptec™-based RAID controller). Single path configurations only.

Sun StorageTek PCI Express SAS 8-Channel External HBA (SG-XPCIE8SAS-E-Z,

LSI™-based disk controller). Single or multipath configurations supported.

Sun StorageTek ExpressModule SAS 8-Channel External HBA

(SG-PCIE8SAS-EB-Z, LSI-based disk controller). Single or multipath

configurations supported.

An updated list of supported HBAs is maintained in the Sun Storage J4500 Array

Product Notes (820-3162) available on the Sun documentation web site http://docs.sun.com

.

A single path configuration consists of a single SAS cable connecting a single HBA to one of the array’s SAS fabrics, either A or B.

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A multipath configuration consists of connections to both of the J4500 array’s SAS fabrics, A and B, using one or more HBAs in order to create a dual path. More on configuring your array for multipathing can be found in the Sun Storage J4500

Array System Overview (820-3163).

Configuring zoning of the array storage is currently only available using the Sun

Common Array Manager (CAM) through an LSI-based HBA connected to the array. For more information on zoning, see the Sun Storage J4500 Array System

Overview (820-3163).

Note –

The J4500 array is not supported in a clustering configuration.

2.1.2.3

2.1.2.4

Connecting Multiple Sun Storage J4500 Arrays

Sun Storage J4500 arrays can be daisy-chained, or cascaded, together as follows:

The maximum number of arrays that can be daisy-chained together is limited by the number of SAS targets (also called “devices” or “end devices”) supported by the attached HBA. Check the HBA’s documentation to see how many SAS targets are supported. Also see

Section 2.1.2.4 “SAS Target Limits” on page 2-4

.

In single path configuration, arrays may be cascaded from Port 1 (out) of the upstream array to Port 0 (in) of the downstream array. Array cascade port connections must be of compatible types (for example, no array cascading from

Port 1-to-1, Port 0-to-0, or Port 0-to1

).

In a multipath configuration (creating a dual path by utilizing both SAS fabrics),

Sun recommends cascading the host links in opposite directions from the edge of the SAS fabric. For example, the first host connection goes to the top of the SAS A fabric and cascades down, while the second host connection goes to the bottom of the SAS B fabric and cascades up. Array cascade port connections must be of compatible types (for example, no array cascading from Port 1-to-1 or Port 0-to-0).

For more on configuring for multipathing, see the Sun Storage J4500 Array System

Overview (820-3163).

Do not mix a J4500 array with any other type of JBOD array in a daisy-chain.

Check the Sun Storage J4500 Array System Overview (820-3163) for updated configuration information.

SAS Target Limits

To ensure a given configuration of J4500 array’s does not exceed the HBAs’ target

limit

, the following rules apply:

For single path configurations, each hard disk visible to an HBA consumes one target.

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2.1.2.5

2.1.3

For multipath configurations, each hard disk visible to an HBA consumes two targets.

Each expander visible to an HBA consumes three targets. There are two expanders per SAS fabric in the array.

When zoning is being used on array storage, there must be a host that runs the zoning manager. This host must be able to communicate with all targets in the system. This means that the number of targets seen by the zoning host’s HBA(s) must not exceed the target limit for that HBA.

Refer to your HBA documentation to find out how many targets it can support.

Targets might also be called “devices” or “end devices.”

Configuration with Blade Servers

For Sun Blade Server Modules, the same configuration rules listed above for Sun

Storage J4500 arrays apply with the following blade-specific rules:

An array may be connected to a Sun Blade Server Module in single path or

multipath

configuration using a supported SAS PCIe ExpressModule HBA that includes SAS x4-wide connectors. An updated list of supported HBAs are maintained in the Sun Storage J4500 Array Product Notes (820-3162) available on the

Sun documentation web site.

The array may not be connected to a SAS NEM in the chassis (a Network

Expansion Module that includes external SAS connectors). A server blade may also have its own set of drives and expanders, or be connected to a storage blade and already be using the SAS NEM. This can limit the number of available SAS targets supported by the blade server’s internal HBA. Therefore, the J4500 array should only be connected to a supported SAS PCIe ExpressModule HBA that is used exclusively to connect external SAS devices.

Cabling the SAS Connectors

The following figure shows the SAS connector ports for cabling J4500 array to your server’s HBA. Before cabling a J4500 array to your server’s HBA, refer to the

Section 2.1 “Configuration and Cabling” on page 2-1 .

Chapter 2 Configuring and Powering On the Sun Storage J4500 Array

2-5

FIGURE 2-1

Sun Storage Array Back Panel SAS Ports

Figure Legend

1

SAS B (secondary fabric)

2

SAS A (primary fabric)

The J4500 array has two SAS fabrics: SAS A (primary) and SAS B (secondary). Each connector port on both fabrics connects to all 48 disks. SAS B is a redundant fabric.

SAS port descriptions and assignments are shown in

FIGURE 2-2

.

Examples of supported configurations can be found in

Section 2.1.4 “Example

Configurations” on page 2-7 .

FIGURE 2-2

SAS Ports (Diagram Applies to Both SAS A Ports and SAS B Ports)

Figure Legend

1

SAS Port 1 (4 PHYs, activity LED, supports direct or table routing)

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2.1.4

2.1.4.1

Figure Legend

(Continued)

2

SAS Port 0 (4 PHYs, activity LED, supports direct or subtractive routing)

3

Port 1 connects to an HBA, or to a downstream J4500 array

4

Port 0 connects to an HBA, or from an upstream J4500 array

Example Configurations

This section includes examples of supported single path and multipath configurations for your J4500 array.

Single Host Direct Connection

FIGURE 2-3

shows a simple host to array connection. In this configuration, the host connection can be to any port, either SAS fabric.

FIGURE 2-3

Single Host to Array Connection

2.1.4.2

Single Host With Cascaded Arrays

FIGURE 2-4

shows a host with two cascaded arrays. In this configuration, the cascaded arrays comsume a total of 108 SAS targets (96 disk targets and 12 expander targets).

All of the supported HBAs for the J4500 array can support this number.

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FIGURE 2-4

Host to Cascaded Arrays

2.1.4.3

Single Host Direct Connection to Two Arrays

FIGURE 2-5

shows a host with two cascaded arrays. In this configuration, the two arrays also comsume a total of 108 SAS targets (96 disk targets and 12 expander targets). All of the supported HBAs for the J4500 array can support this number.

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Sun Storage J4500 Array Service Manual • March 2013

FIGURE 2-5

Host with Two Direct-Connected Arrays

2.1.4.4

Multipath Connection to the Array

FIGURE 2-6

shows an example of multipath cabling using one host, two HBAs and two cascaded arrays. Note that the host links are cascaded in opposite directions from the edge of the SAS fabric so that if one array enclosure fails, there is still host access to the working array enclosure. This configuration supports zoned storage and failover.

For more information on configuring multipath, see the Sun Storage J4500 Array

System Overview (820-3163).

Chapter 2 Configuring and Powering On the Sun Storage J4500 Array

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FIGURE 2-6

Host with Multipath-Connected Arrays

2.1.4.5

Multi-host Zoned Connection to the Array

FIGURE 2-7

shows a color-coded example of four hosts connected in single path configuration to an array. In this configuration, the storage in the array has been separated into four zones. Each host (indicated by a separate cable color) can only see the disks in its assigned zone. In this configuration, each of the hosts must have the

Sun Common Array Manager (CAM) proxy agent installed and running, or one of the hosts can act as the CAM management host while the others run the proxy agent.

The CAM management host is used to configure and manage zones on the array. For more information on configuring zoning, see the Sun Storage J4500 System Overview

(820-3163).

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Sun Storage J4500 Array Service Manual • March 2013

FIGURE 2-7

Four Hosts Directly Connected to a Zoned Array

2.2

Powering On and Off the Array

The Sun Storage J4500 array has two levels of power: standby power and main power. The initial setup of the array should be done before plugging in AC power.

The procedures for powering on to main power mode and going from main power mode to standby power mode are included in this section.

Chapter 2 Configuring and Powering On the Sun Storage J4500 Array

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Caution –

Do not operate the enclosure without all fans, component heatsinks, air baffles, and covers installed. Severe damage to enclosure components can occur if the enclosure is operated without adequate cooling mechanisms.

▼ To Power On the Array

The proper power-up sequence for a system connected to the Sun Storage J4500 array is to first power on the array, wait one minute, then power on the host server. This wait time allows all 48 array hard disk drives to power up to the point where the server can see them and helps reduce the number of start-up device link messages saved to the server’s log file

To apply main power to the array, do the following:

1. Connect two grounded AC power cords to the two AC power supply connectors at the back of the array enclosure.

2. Then connect the other ends of the two AC power cords to grounded AC

(110-220 VAC) power outlets.

Connecting the AC power cords to the array automatically applies main power to the array. In main power mode, the array Power/OK LED next to the Power button lights and remains lit.

Note –

See the service label on the hard disk drive access cover for an explanation of the LEDs on the hard disk drives, fans, power supply, and system controller. Or, refer to

Chapter 4 .

▼ To Place the Array Into Standby Power Mode

The front panel power button is used to switch the array from main power to standby power (or from standby power back to main power). Standby power mode leaves the power supplies partially on, but powers down the enclosure hard disks,

SAS expanders and SAS links.

1. To switch the array enclosure from main power mode to standby mode, use a stylus to press and hold in the power button on the front panel (see

FIGURE 1-2

)

for 5 or more seconds (during which the locate LED will flash).

As the enclosure enters standby power mode, the Power/OK LED on the front and back panel blinks, indicating that standby power mode is working.

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2.2.1

2. Release the power button on the front panel.

With AC power connected, the array takes about 10 seconds to go fully into standby power mode.

Caution –

To power off the array completely, you must disconnect the AC power cords from the back panel of the array enclosure. It takes a full 20 seconds with the

AC power cords unplugged for internal power to be completely drained from the enclosure.

3. To reapply main power to the array from standby power mode, use a stylus to press and release the recessed Power button on the array front panel. See

FIGURE 1-2

.

When main power is applied to the array, the Power/OK LED next to the Power button lights and remains lit.

▼ To Power Off the Array

To power off the array completely, you must disconnect the AC power cords from the power supplies at the back of the array enclosure. The power switch is only used for putting the array into standby power mode, or applying main power from standby power mode. Do the following to power off the array:

To completely power off the array, disconnect the two AC power cords from the power supplies at the back of the enclosure.

It takes a full 20 seconds with the AC power cords unplugged for the internal power to be completely drained form the enclosure.

AC Power Failure Auto-Recovery

If AC power is temporarily lost to the array, for example if the municipal power grid experiences an outage, the array automatically restarts to main power mode when power is restored. No user intervention is required.

The same behavior occurs if you disconnect the AC power cords from the back of a powered-on array and then reconnect them.

Chapter 2 Configuring and Powering On the Sun Storage J4500 Array

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Sun Storage J4500 Array Service Manual • March 2013

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