This article explains the minor alarm "FPC [X] replace DIMMs now/FPC [X] replace DIMMs" observed on SRX devices, cause of the alarm and steps to mitigate the issue.

These alarms get generated on the device due to DIMM[Dual In-line Memory Module] failure on the line card and needs replacement. Hence, Replacement/RMA of the line card is its solution.

Please open a case with JTAC Support for troubleshooting the possibility of performing an RMA of the faulty linecard.

The below alarms will be generated on the device:

root@SRX> show chassis alarms

2 alarms currently active
Alarm time Class Description

2023-04-30 03:16:06 PDT Minor FPC 1 replace DIMMs now
2023-04-30 03:04:30 PDT Minor FPC 1 replace DIMMs
 

The following log messages are reported in syslog:

Apr 30 03:04:29  SRX node0.fpc1 Cowra: XLP1, ch2 should be replaced!
Apr 30 03:04:30  SRX alarmd[21078]: Alarm set: FPC id=788529512, color=YELLOW, class=CHASSIS, reason=FPC 1 replace DIMMs
Apr 30 03:04:30  SRX craftd[20049]:  Minor alarm set, FPC 1 replace DIMMs -------------------------->> Minor alarm set
Apr 30 02:55:55 SRX node0.fpc1 Cowra: XLP1 ECC error, chA 0 0 chB 288555523 4987, correctable 282, uncorrectable 0  
Apr 30 02:55:57 SRX node0.fpc1 Cowra: XLP1 ECC error, chA 0 0 chB 288555523 891, correctable 284, uncorrectable 0  
Apr 30 03:16:06 SRX node0.fpc1 Cowra: XLP1, ch2 should be replaced IMMEDIATELY!  
 
Apr 30 03:16:06 SRX alarmd[21078]: Alarm set: FPC id=805306728, color=YELLOW, class=CHASSIS, reason=FPC 1 replace DIMMs now
Apr 30 03:16:06 SRX craftd[20049]: Minor alarm set, FPC 1 replace DIMMs now -------------------------->> Minor alarm set
 

DIMM is a module that contains one or several random access memory (RAM) chips on a small circuit board with pins that connect it to the motherboard.

Error correction code [ECC] DIMM is a type of computer data storage module that uses an error correction code to detect and correct n-bit data corruption which occurs in memory. ECC memory maintains a memory system immune to single-bit errors.

When DIMMs encounter multiple uncorrectable errors simultaneously, the module fails and cannot recover on its own and hence needs replacement.

As DIMM's are built-in module into the line card and are not hot replaceable, the line card needs to be replaced/RMA'ed.

Please proceed with hardware replacement of the line card.
 

Please open a case with JTAC Support for troubleshooting the possibility of performing an RMA of the faulty linecard.

Initial Draft - 05/05/23