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Upgrading to Dell/EMC CX4 Series Storage Systems

Applied Technology 5

Convert From

Convert To

CX4-120

CX4-240

CX4-480

CX4-960

CX300

Yes

CX3-10c

Yes

Conditionally

CX500

Yes

CX3-20

Yes

CX4-120

Conditionally

CX700

Yes

CX3-40

Yes

CX4-240

Yes

CX4-480

Yes

Conditionally supported upgrade paths must meet certain prerequisites. See the ―Special case upgrade paths‖ section

for more information.

Unsupported upgrades

In addition to the upgrade paths absent from Table 1, the following upgrades are not supported:

A CX3-10c using SATA for the OS drives may only be upgraded to a CX4-120. There is no procedure to swap

the SATA drives for the Fibre Channel drives that are required in the larger systems.

A CX4-120 using SATA for the OS drives may not be upgraded. There is no procedure to swap the SATA

drives for the Fibre Channel drives that are required in the larger systems.

An AX model array may not be upgraded into the CX family.

Planning for the Upgrade

If deciding to upgrade, there are a number of planning considerations that should be thought out before the upgrade

is purchased. A high-level data-in-place procedure is outlined in Figure 1.

Prepare

Swap

Hardware

Boot

Utility

Partition

Convert

Databases

Boot

Flare

Install

Images

Figure 1. Data-in-place upgrade flow chart

The detailed procedure for performing the upgrade is found in the Dell Professional Services’ Procedure Generator.

The Dell service professional that performs the upgrade follows this procedure.

The following sections list the technical considerations that should be taken into account before the upgrade takes

place.

Downtime

Because physical hardware is swapped during the conversion, the storage system must be offline during the

conversion. Some of the major steps that are taken during this time are:

1. Stop all I/O to the system and power down.

2. Convert storage processors to the new model and swap SP cables as necessary.

3. Boot the array to Utility Partition – A recovery mode where software changes can be made.

4. Convert databases – All FLARE databases are converted to a new format.

5. Upgrade FLARE – FLARE is upgraded to the latest level that supports the new hardware.

6. Boot the system.

7. Reconnect the hosts – The conversion does not break existing zoning or LUN mappings.

It is realistic to expect 8-12 hours of downtime for the upgrade (3-6 hours for in-family upgrades). This assumes that

all considerations in this paper have been addressed before starting the upgrade. If any other steps are required

during the conversion (such as power reconfiguration or re-racking of components), then additional time must be

planned when scheduling and utilizing the outage window.

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