Dell DAE User Manual download pdf (Page 7)

Upgrading to Dell/EMC CX4 Series Storage Systems

Applied Technology 7

It is the responsibility of the presales account team to identify if LUN migration will be required. The CAP2 tool

can be used to identify LUNs that need to be migrated. Use ―Appendix B: Virtual LUN Migration Performance‖ as a

guideline to estimate how long LUN migrations will take.

All conflicting LUNs identified by CAP2 must be relocated before the upgrade. For metaLUNs with at least one

component residing in the new FLARE reserved area, the entire metaLUN must be relocated. Even if CAP2

identifies free space on the first five drives, there is no guarantee that newly bound LUNs will not conflict with the

new reserved area. Therefore, all LUNs identified by CAP2 should be migrated off of the first five drives.

Physical enclosure relocation

CX4 series systems utilize SPE and SPS models that may have different rack heights than previous systems.

Depending on how the current system is racked, enclosures may need to be re-racked during the upgrade. This

should be planned prior to the upgrade, especially since two people may be required to lift some of the enclosures.

Use the NEMA rack heights provided in Table 2 as a guideline to determine whether or not enclosures require

relocation.

Table 2. Dell/EMC SPE + SPS + DAE-OS rack heights

Convert From

Convert To

CX4-120

(6U)

CX4-240

(6U)

CX4-480

(6U)

CX4-960

(9U)

CX300 (4U)

+ 2U

+ 5U

CX3-10c (5U)

+ 1U

+ 4U

CX500 (4U)

+ 2U

+ 5U

CX3-20 (5U)

+ 1U

+ 4U

CX4-120 (6U)

Same

+ 3U

CX700 (8U)

- 2U

+ 1U

CX3-40 (5U)

+ 1U

+ 4U

CX4-240 (6U)

Same

+ 3U

CX4-480 (6U)

+ 3U

As an example, a CX3-40 SPE, SPS, and the first tray of disks (DAE-OS) require 5U of rack height. If upgrading to

a CX4-960, the same components require 9U of rack height. If this space is not available, Dell recommends that you

move the DAEs up in the rack to accommodate the new enclosures.

As an alternative to re-racking, the new SPE and SPS may be located either at the top of the cabinet or in an adjacent

cabinet. They must be located together because of the short length of the SPS signal cable. Back-end cables are

currently available in lengths up to 5 meters, so the SPE must be within that distance of the DAE-OS. Take care

when creating a non-standard rack configuration, as this may cause confusion, which could lead to human error in

future servicing of the system.

Existing equipment is utilized as much as possible in the conversion. For example, if upgrading from a CX300 or

CX500, the SPs in the DPE are replaced with link control cards (LCCs), and this enclosure remains the DAE-OS for

the upgraded system. When upgrading a CX4-120 to a CX4-240 or CX4-480, the SP CPU module is replaced in the

original chassis.

Power Requirements

When performing an upgrade, the new system will most likely draw more power than the current system. Use the

EMC Power Calculator (on EMC Powerlink) or the Dell Data Center Capacity Planner (Dell’s DCCP at

www.dell.com/calc) to determine what the new power requirements are. It is important to note the power

distribution limitations of the current cabinet. For example, a Dell 40U rack requires two 30-Amp feeds. For

redundancy, each 30-Amp feed must be able to power all enclosures in the rack. For compliance with North

American wiring requirements, the feeds must be loaded at no more than 80 percent of their rating. Therefore, the

enclosures placed in this type of rack must not exceed 24 Amps of current draw. Ensure that the new configuration

will not exceed this number if it will be in this type of rack.

To summarize:

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