Dell EMC VxFlex Ready Node, User Manual

Page: 60 / 354

All SDCs will require reconfiguration, to reflect the changes made to the MDM cluster.
Otherwise, the SDCs will not be able to communicate with the MDM cluster, and
volumes will not be accessible.
Monitor of SDC and SDS connections
The system monitors all connections between SDCs and SDSs and sends out an alert
when an active connection between an SDC and an SDS goes down.
To effectively monitor SDC and SDS connections, the MDM collects connectivity
updates from all of the SDCs. The MDM posts events whenever an SDC connects to
or disconnects from a specific SDS IP address. The MDM frequently analyzes the
connectivity status to determine the current system state. The system does not send
out alerts for temporary connectivity issues that are resolved in less than 10 seconds.
The following are the possible connectivity states between SDCs and SDSs in the
system:
l
All connected
l
One SDC is disconnected from one SDS
l
One SDC is disconnected from one SDS IP address
l
One SDC is disconnected from all SDSs
l
All SDCs are disconnected from one SDS
l
All SDCs are disconnected from one SDS IP address
l
All SDCs are disconnected from all SDSs
l
Multiple disconnections
When the system's connectivity state changes to any state other than
All
Connected
, an alert is displayed in the VxFlex OS GUI and is written to the MDM
event log. Once an alert is generated, you can use the SCLI to query details on the
disconnection using the command
scli --
query_sdc_to_sds_disconnections
. For more information about running SCLI
commands, see the CLI Reference Guide .
The MDM does not monitor the connectivity state of SDCs or SDSs in the following
scenarios:
l
SDS is in maintenance mode
l
SDS is disconnected from the MDM
l
SDS is in the process of being removed
l
SDC is disconnected from the MDM for more than two minutes
l
SDC is not approved
The alerts are detailed in "Alerts in SNMP, VxFlex OS GUI, REST, and ESRS" in the
Monitoring VxFlex OS .
S.M.A.R.T. hardware monitoring
The VxFlex OS bare-metal solution now provides monitoring capabilities for RAID
controllers and storage devices compatible with S.M.A.R.T. (Self-Monitoring, Analysis
and Reporting Technology) protocols.
In Linux-based environments, S.M.A.R.T.-compatible HDDs, SSDs and RAID storage
controllers can be monitored for S.M.A.R.T. attributes such as temperature, SSD wear
Architecture
60 Dell EMC VxFlex Ready Node AMS User Guide