Symptoms

Dell EMC Enterprise Systems Rack Rails have a self-adjusting slide feature that enables a sliding rail solution to support multiple systems of variable depth. This feature relies on a spring in each rail assembly to control the position of the slide body assembly. When in use, the slide body assembly will slide into the rack cabinet when the system is nearly installed.This feature impacts users in three ways: When the rails are installed in a rack, The rail adjustability range will be the same regardless of system depth. This is because the feature is not used until a system installed. If the system being installed requires the feature, the minimum rail adjustability limit is increased by the distance the rail requires to slide in to the rack, to support the system. The minimum rail adjustability limit is documented here. There is some additional resistance from the spring in each rail, compared to previous rail assemblies, when the system is almost completely installed in the rack. For most rails, the resistance is observed within the final 55 mm [2 inches] before the slam latch engages with the rail. A unique sound may be heard coming from the rail. The sound comes from the spring as it is stretched or relaxed, while installing or removing a system from the rack.

Cause

Some issues have been reported, which relate to the self-adjusting slide feature. These are part of the normal functionality of the assembly and include: The system cannot be pushed all the way into the rack. The system slides all the way back but encounters resistance 55 mm [2 inches] before the server goes all the way in. There is an unusual sound coming from the rails when the system is almost completely installed or when the system is initially released from the rails. When the slam latch is released, the system automatically slides out of the rails for a short distance.

Resolution

Check the Dell EMC Enterprise Systems Rail Sizing and Rack Compatibility Matrix and ensure that the rack spacing matches up with the minimum adjustability range. If the rack spacing does not match up, change the rack spacing in order to match the minimum adjustability limit value in the matrix. Figure 1: Excerpt from the Dell EMC Enterprise Systems Rail Sizing and Rack Compatibility Matrix If the rack spacing matches up with the minimum adjustability range, it is acceptable to apply a minimal amount of pressure to push the server into the rack. If minimum adjustability limit is within the static rail adjustability range, static rails can be used instead. Static rails do not support cable management or in-rack serviceability. For R340, some customers may encounter the following symptoms (but not limited to): Rail is not mounted or locked well.Latch is broken.Rail is easily pushed out from rear side. Dispatch new ears (v2 version as red) with both RCP and LCP by following the table that is listed below. DPN of Shipped EarsDPN of New EarsDPNDescriptionDPNDescriptionY8F2PASSY, LTCH, RACK, LF, CP, R240/340 WFXKXASSY, LTCH, RACK, LF, CP, R340, V2C0XH4ASSY, LTCH, RACK, RT, FIO, R240/340P6CV8ASSY, LTCH, RACK, RT, FIO, 340, V2

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