C H A P T E R  4

Verifying the Link Rate and Powering On the Array

This chapter describes verifying the link rate and initial tray power-on procedures. Perform the following procedures in the order listed:

Before Powering On

You can set up a Dynamic Host Configuration Protocol (DHCP) server to issue the IP address to each controller. If a DHCP server is not available, the controller tray defaults to internal static IP addresses. (See the Sun StorageTek Common Array Manager Software Installation Guide for information about configuring IP addresses on array controllers.)

For instructions on how to set up the DHCP server, see Configuring a DHCP Server.

Verifying the Link Rate for Each Tray

The Tray Link Rate switch on each expansion tray enables you to set the data transfer rate to 4 Gbits/second or 2 Gbits/second for drives on the tray.

Note - The Tray Link Rate switch does not affect the data rate of host ports.

An expansion tray can contain disk drives supporting both 4 Gbits/second and 2 Gbits/second data transfer speeds. If the array has one or more disk drives that operate at 2 Gbits/second, set the Tray Link Rate switch on all trays to 2 Gbits/second. If all disk drives in the array operate at 4 Gbits/second, set the Tray Link Rate switch to 4 Gbits/second. If there is a mix of 2 Gbits/second and 4 Gbits/second disk drives in the array, set the link rate to the lower speed.

An expansion tray is set at the factory to whatever speed its disk drive rates are. It is possible to mix drive speeds within an enclosure supporting both 4 Gbits/second and 2 Gbits/second, but the expansion tray rate setting must be set to the lowest disk drive speed rate using the 4 Gbits/second and 2 Gbits/second switch located at the lower right front of the enclosure.

Should there be an enclosure to controller data transfer speed mismatch, the LED error code segment display at the rear of the controller tray will indicate a code of: H7 - Current Enclosure Fibre Channel Rate Different than Rate Switch.

You can determine the speed of the disks in the tray by removing one of the disk drives and examining the label. Next to the disk name on the label is a number indicating the RPM and speed of the disk. For example, the number 15k.4 indicates the disk is 15,000 RPMs and 4 Gbytes.

Verify that all expansion cables and SFPs are rated at 4 Gbits/second when setting the link rate to 4 Gbits/second.

Note - Change the position of a Tray Link Rate switch only when the tray is powered off.

To set the link rate for each tray:

1. Locate the Tray Link Rate switch at the lower right front of the tray (FIGURE 4-1).

FIGURE 4-1 Tray Link Rate Switch

2. Set the default link rate for the tray as follows:

Powering On and Powering Off the Array

This chapter provides information on powering on and powering off the Sun StorageTek 6540 Array. It contains the following sections:

Powering On the Array

Use this procedure to turn power on for all trays installed in the cabinet (FIGURE 4-2).

Note - The order in which you power on the trays is important. Be sure to power on the controller tray last in order to ensure that the disks in the expansion trays have enough time to spin completely before being scanned by the redundant array of independent disks (RAID) controllers in the controller tray.

FIGURE 4-2 Tray Power Connectors and Switches

1. Turn on the cabinet circuit breakers, located at the bottom of the cabinet, if applicable.

2. Press the power switches at the back of each expansion tray to the On position.

Wait until the tray ID/Diag display on the back indicates the number of the tray ID to be sure that the tray has powered up fully before proceeding to the next step.

3. Press each power switch at the back of the controller tray to the On position.

While the tray powers on, the green and amber LEDs at the front and back of the controller tray turn on and off intermittently. Depending on your configuration, it can take several minutes for the tray to power on. Wait at least two minutes until all of the drives are spinning completely before moving to step 4. When the power-on sequence is complete, the controller tray ID indicates 85.

4. Check the status of each tray.

After the power-on sequence is complete, confirm that the green OK/Power LEDs are steady green, both on the tray and on each drive in the tray.

If all tray and drive OK/Power LEDs are steady green and the amber Service Required LEDs are off, the power-on sequence is complete and no faults have been detected.

Powering Off the Array

The array rarely needs to be powered off. You remove power only when you plan to physically move the array to another location.

To power off the array, do the following:

1. Stop all I/O from the hosts, if connected, to the array.

2. Wait approximately 2 minutes until all disk drive LEDs have stopped flashing.

After a 2-minute period, data residing in cache is written to disk and the battery mechanisms are disengaged.

Note - If Media Scan is enabled (default), the disk drive LEDs will continue to flash after the 2-minute period has elapsed. However, the LED flash rate during a media scan (slow, periodic blink) is different from the flash rate of I/O (fast, random).

3. Check the Cache Active LED on the controller to determine if any outstanding cache needs to be written (TABLE 1-4).

If the LED is on, there is still data that needs to be flushed and written to disk.

Ensure that the Cache Active LED is no longer flashing before powering off the array.

4. Press each power switch at the back of the controller tray to the Off position.

5. Press the power switches at the back of each expansion tray to the Off position.

Next Steps

Now you are ready to install data host software, HBAs, and other software on different host platforms, as described in Chapter 5.