Dell R720/R720xd White Paper
Contents
1. Procedures for Dell PowerEdge R720 R7 720xd Systems 1 2 Routing the power cables through the strain reliefs After you have installed the tray and cables route the power cables through the strain reliefs located on the power supply handles as shown in Figure 2 Figure 2 Routing power cables through the strain reliefs 1 3 Installing the CMA The CMA can be installed on either the rear right or rear left side of the rails as described in the CMA Installation Instructions Mounting the CMA on the side that is opposite of the power supplies left side mount is recommended otherwise the CMA must be partially disconnected in order to remove the outer power supply Refer to Section 2 for details on power supply replacement NOTE If you are installing fiber optic cables in the CMA a cable bend radius of at least 1 inch must be maintained throughout the length of the cable It is recommended that fiber optic cables be routed on the exterior of the cable bundle to increase the bend radius of the fiber optic cables through the CMA Additionally a large amount of slack at the entrance and exit of the CMA is recommended 1 3 1 Installing the inner CMA attachment bracket As described in the CMA Installation Instructions locate and attach the appropriate inner CMA attachment bracket based on which side you wish to mount the CMA Use the bracket marked A for mounting the CMA on the left side and the bracket marked B for mounting on2. Routing Procedures for Dell PowerEdge R720 R7 720xd Systems 4 Disengage the strain relief and disconnect the power cord from the power supply 5 Disconnect both CMA attachment housings from the brackets on the rails as shown in Figure 7 6 Detach the inner CMA bracket from the rail by pushing on the end of the lock spring and lifting the bracket up and to the left until it clears the standoffs on the rail 7 While supporting the CMA with one hand remove and replace the outer power supply with the other hand as shown in Figure 8 8 Reinstall the inner CMA bracket to the rail and reconnect the CMA to the brackets 9 Plug in the power cord re engage the strain relief replace the CMA support tray and return the CMA to the closed retracted position Figure 7 Disconnecting the CMA attachment housings Cable Routing Procedures for Dell PowerEdge R720 R7 720xd Systems Section 3 Cabling a PowerEdge R 20 R 20xd system on sliding rails without a CMA NOTE The CMA for Dell PowerEdge R720 R720xd systems is optional Without the CMA installed the system must be powered down and all cables disconnected before it can be extended out of the rack 3 1 Routing the cables 1 Connect all applicable cables to the rear of the system and verify that all connections are secure 2 Using the hook and loop straps supplied with the rail kit bundle the cables and secure them to either the left or right outer CMA attachment bracket as described
3. both ends of the CMA See Figure 6 for an example of a completed right side mounted CMA installation Cable Routing Procedures for Dell PowerEdge R720 R7 20xd Systems Figure 6 Right side mounted CMA installation CMA shown in service position m _ le a D x T gt 1 Gee yy Y B _ q 5 e of z ai a en x Section 2 Replacing a power supply on a PowerEdge R720 R720xd system with a CMA Llo Jg KR U N 2 2 Replacing a power supply with a left side mounted CMA Swing the CMA to its service position as described in the CMA Installation Instructions provided with the CMA kit Remove the tray from underneath the CMA as described in the CMA Installation Instructions Disengage the strain relief and disconnect the power cord from the power supply Replace the power supply Plug in the power cord re engage the strain relief replace the CMA support tray and return the CMA to the closed retracted position Replacing a power supply with a right side mounted CMA If the innermost power supply must be replaced then follow the steps described in Section 2 1 If the outermost power supply must be replaced follow the steps described below Swing the CMA to its service position as described in the CMA Installation Instructions provided with the CMA kit Remove the tray from underneath the CMA as described in the CMA Installation Instructions Cable
4. paper For additional details regarding potential interferences between the CMA and rear mount power distribution units PDUs in Dell racks as well as general information about third party rack compatibility refer to the Dell Enterprise Systems Rail Sizing and Rack Compatibility Matrix located at http content dell com us en enterprise d business solutions engineering docs en Documents rail rack matrix pdf aspx Section 1 Cabling a PowerEdge R 20 R 20xd with a CMA This section details how to cable the PowerEdge R720 R720xd systems on sliding rails using a CMA If you are cabling the system without the optional CMA refer to Section 3 Follow the instructions contained in the Rack Installation Instructions in the sliding rail kit to install the server into the rack Once installed use these instructions to install the cables All illustrations in the following sections were created using a PowerEdge R 20xd system NOTE PowerEdge R720 R720xd systems are not compatible with the PowerEdge R710 rails and CMA 1 1 Connecting the cables to the system Attach the CMA tray to the back of the rails as described in the CMA Installation Instructions provided in the CMA kit Connect all applicable cables to the rear of the system and verify that all connections are secure See Figure 1 Figure 1 System with cables installed nel al s re gi bip a phe a My COTTO a DE a s J Eec E Hf a Cable Routing
5. Cable Routing Procedures for Dell PowerEdge R720 R720xd Systems Cable Routing Procedures for Dell PowerEdge R 20 R 20xd Systems This Dell Technical White Paper explains the best practices for routing and securing the cables exiting the back of the R720 R 20xd systems Greg Henderson and Jose L Flores Data Center Infrastructure Engineering March 2012 Cable Routing Procedures for Dell PowerEdge R720 R7 20xd Systems This document is for informational purposes only and may contain typographical errors and technical inaccuracies The content is provided as is without express or implied warranties of any kind 2012 Dell Inc All rights reserved Dell and its affiliates cannot be responsible for errors or omissions in typography or photography Dell the Dell logo and PowerEdge are trademarks of Dell Inc Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Dell disclaims proprietary interest in the marks and names of others March 2012 Rev 1 0 Cable Routing Procedures for Dell PowerEdge R720 R7 720xd Systems Contents IVEFOGUCTION cssscssesenscncacacsctvacesacievanceicinsacavadasccesssensanaiacissacaaawesaaauateveomsnsaveeuseesesseneesawnsis 4 Section 1 Cabling a PowerEdge R720 R720xd with a CMA ssssssessssesessesescosseseecesescoesesesceeese 4 1 1 Connecting the cables to the system ssssesesescseceseecesescecoeseeces
6. all applicable cables to the rear of the system and verify that all connections are secure 4 Using the hook and loop straps bundle the cables and secure them to either the left rail or right rail as described in the Rack Installation Instructions See Figure 11 for an example of data cables secured to the left rail and power cables secured to the right rail as viewed from the rear of the system Figure 11 Cabling a system installed in static rails 11
7. e 6 Right side mounted CMA installation CMA shown in service position sssesseseseeseses 8 Figure 7 Disconnecting the CMA attachment housings sssesssossesesesesesesesesesesesescsosoeseoee 9 Figure 8 Replacing the outer power supply s ssssssssesesescseseseecescscseseseecsesesoeeeseecesescoeceseeceeeee 9 PISS Cable routine without a CMAcserssisscsirsresesisies stere oe Geese va one au ener sau peeneecucsewes 10 Figure 10 Removing the outer CMA brackets for shallow racks csecccceeeccccceeeecceeseeceeeaees 10 Figure 11 Cabling a system installed in static rails cece ccc ceeccceeeccceecccescceesccessccesescceess 11 Cable Routing Procedures for Dell PowerEdge R720 R7 720xd Systems Introduction This white paper covers recommended cable routing procedures for the Dell PowerEdge R720 R720xd systems in the following racks e PowerEdge 2410 4210 e PowerEdge 2420 4220 4820 including wide and deep versions e PowerEdge Energy Smart 4020S 4620S If you are using the optional cable management arm CMA following these procedures will allow you to extend the system from the rack for service without powering down or disconnecting the cables If you are not using the CMA following these procedures will ensure secure attachment and strain relief of the cables behind the system For guidelines on how to route cables within the rack refer to the Dell Best Practices Guide for Rack Enclosure white
8. esoeceseeoeoeeeeceseeceeee 4 1 2 Routing the power cables through the strain reliefS sessssessssesesseseseecesesceseseee 5 1 3 UNO E NSE TEE EE REEEEE ewiedss EE EEE 5 Section 2 Replacing a power supply on a PowerEdge R720 R720xd system with a CMA 66 8 2M Replacing a power supply with a left side mounted CMA cc ccc ccc ceececeeeecceeeeceeeees 8 Lek Replacing a power supply with a right side mounted CMA sssssssssesesesesesesesosososssose 8 Section 3 Cabling a PowerEdge R720 R720xd system on sliding rails without a CMA 666 10 3 1 ROUINO UNG CADES crsiirisissiis inttr nsir EE i EENET EEEE EENES 10 3 2 Removing the outer CMA brackets for shallow racks ssessesesessesescsssesescesesceeceseee 10 Section 4 Cabling a PowerEdge R720 R720xd system installed on static rails cece cece eee ees 11 Figures Figure 1 Systemi with cables INSTAWEC sscincvawaiscinenensvsnesaysun wees samara se sessesensaneesseeeseesensesneneueess 4 Figure 2 Routing power cables through the strain reliefs cccccccssccccccssccccsssccccssscsceeessscs 5 Figure 3 Attaching the inner CMA attachment bracket sssssssssossesssesesesesesesesesesosososseoee 5 Figure 4 Routing the cables through the CMA ssssesessscsesessecessecesesosoesesceceseecesesceoeeeeoeeeee 6 Figure 5 Left side mounted CMA installation preferred sssssesssseseesesescesesescesesceseseecesese 7 Figur
9. in the Rack Installation Instructions See Figure 9 for an example of data cables secured to the left outer CMA bracket and power cables secured to the right outer CMA bracket as viewed from the rear of the system Figure 9 Cable routing without a CMA 3 2 Removing the outer CMA brackets for shallow racks If you are installing the system into a shallow rack less than 1 meter deep and you will not be installing a CMA the outer CMA brackets may be removed from the sliding rails if necessary in order to allow the rails to fit properly into the rack Remove the brackets by using a 2 Phillips screwdriver to remove the screws that secure the brackets to the rails as shown in Figure 10 Use the hook and loop Straps supplied with the rail kit to secure the cables to the rack frame if desired Figure 10 Removing the outer CMA brackets for shallow racks N _ i 10 Cable Routing Procedures for Dell PowerEdge R720 R7 720xd Systems Section 4 Cabling a PowerEdge R 20 R 20xd system installed on static rails NOTE The CMA is compatible only with the sliding rails not the static rails 1 Follow the instructions contained in the Rack Installation Instructions found in the static rail kit to install the server into a two post or four post rack 2 Install the hook and loop straps provided in the rail kit through the slots in the rear brackets of the rails as described in the Rack Installation Instructions 3 Connect
10. the right side See Figure 3 Figure 3 Attaching the inner CMA attachment bracket Cable Routing Procedures for Dell PowerEdge R720 R7 720xd Systems 1 3 2 Left side mounting instructions 1 Install the CMA on the rear left side of the rails by attaching both CMA housings to the attachment brackets on the rails 2 Route the cables through the CMA while avoiding twisting the cables Use the hook and loop straps on the CMA to secure the cables 3 If the cable bundle includes a keyboard video and mouse system interface pod KVM SIP it can be placed inside the CMA basket when the CMA is mounted on the left side See Figure 4 Figure 4 Routing the cables through the CMA NOTE Do not store excess cable Slack inside the CMA The cables may protrude through the CMA thus causing binding and potentially damaging the cables Cables entering the CMA should have a small amount of slack to avoid cable strain when the CMA is extended KVM SIP can be placed inside the basket when the CMA is mounted on the left side 4 Once you have routed all of the cables through the CMA dress the cable slack between the back of the system and the entrance of the CMA using the tie wraps provided in the CMA kit 5 Clip off the excess length of material from the tie wraps Make sure that the heads of the tie wraps are positioned so as to avoid interference with adjacent systems Return the CMA to the closed retracted position 6 Extend
11. the system out of the rack to verify that there is sufficient slack in the cables on both ends of the CMA See Figure 5 for an example of a completed left side mounted CMA installation Cable Routing Procedures for Dell PowerEdge R720 R7 720xd Systems Figure 5 Left side mounted CMA installation preferred 1 3 3 Right side mounting instructions 1 Install the CMA on the rear right side of the rails by attaching both CMA housings to the attachment brackets on the rails Route the cables through the CMA while avoiding twisting the cables Use the hook and loop straps on the CMA to secure the cables If the cable bundle includes a KVM SIP its length may be too short for it to be placed inside the CMA basket Route the remainder of the cable that is beyond the SIP module through the CMA DO NOT secure the SIP to the outside of the CMA as this may restrict the ability of the CMA to support full extension of the rails without causing damage to the SIP Once you have routed all of the cables through the CMA dress the cable slack between the back of the system and the entrance of the CMA using the tie wraps provided in the CMA kit Clip off the excess length of material from the tie wraps Make sure that the heads of the tie wraps are positioned so as to avoid interference with adjacent systems Return the CMA to the closed retracted position Extend the system out of the rack to verify that there is sufficient slack in the cables on
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