Hewlett Packard Enterprise HPE MSA 1060, Installation Manual, Page: 55 / 90

Chapter 7 Troubleshooting 55
memory, the remaining power left in the supercapacitor is used to refresh the cache memory. While the cache is being
maintained by the supercapacitor, the Cache Status LED flashes momentarily slowly.
If the controller has failed or does not start, is the Cache Status LED on/blinking?
Answer Actions
No, the Cache Status LED is off, and the
controller does not boot.
Replace the controller module.
No, the Cache Status LED is off, and the
controller boots.
The system has flushed data to disks. If the problem persists, replace the
controller module.
Yes, at a strobe 1:10 rate – 1 Hz, and the
controller does not boot. Replace the controller module.
Yes, at a strobe 1:10 rate – 1 Hz, and the
controller boots. The system is in self-refresh mode. If the problem persists, replace the
controller module.
Yes, at a blink 1:1 rate – 1 Hz, and the controller
does not boot. Replace the controller module.
Yes, at a blink 1:1 rate – 1 Hz, and the controller
boots. The system is flushing data to nonvolatile memory. If the problem persists,
replace the controller module.
Table 18 Diagnostic LED status: Rear panel "Cache Status"
NOTE See also "Cache Status LED details" on page 79 .
Isolating a host side connection fault
During normal operation, when a controller module host port is connected to a data host, the port's host link status/link
activity LED is green. If there is I/O activity, the LED blinks green. If data hosts are having trouble accessing the storage
system, and you cannot locate a specific fault or cannot access the event logs, use the following procedure. This
procedure requires scheduled downtime.
IMPORTANT Do not perform more than one step at a time. Changing more than one variable at a time can
complicate the troubleshooting process.
Host-side connection troubleshooting featuring FC and iSCSI host ports
The procedure below applies to MSA 1060/2060/2062 controller enclosures employing small form factor pluggable
(SFP) transceivers in 16Gb FC or 10GbE iSCSI host interface ports. It also applies to qualified cable options used for
10GBase-T and DAC. In the following procedure, "cable option" is used to refer to any of the qualified cable options
supporting host interface ports used for I/O or replication.
NOTE When experiencing difficulty diagnosing performance problems with enclosures using SFPs, consider swapping
out one SFP at a time to see if performance improves.
1. Halt all I/O from hosts to the system (see "Stopping I/O" on page 50 ).
2. Check the host link status/link activity LED.
If there is activity, halt all applications that access the storage system.
3. Check the Cache Status LED to verify that the controller cached data is flushed to the disk drives.
l
Solid – Cache contains data yet to be written to the disk.
l
Blinking – Cache data is being written to nonvolatile memory.