All MIBs › UCD-SNMP-MIB › memAvailRealX
memAvailRealX
Module: UCD-SNMP-MIB
OID (symbolic): UCD-SNMP-MIB::memAvailRealX
OID (numeric): 1.3.6.1.4.1.2021.4.21
Node type: OBJECT-TYPE
Type: CounterBasedGauge64
Access: read-only
Description: The amount of real/physical memory currently unused or available.
What is memAvailRealX?
This OID reports the amount of real/physical memory currently unused or available on this host, in kilobytes, as a 64-bit gauge for hosts with very large RAM. An admin watches this to detect memory exhaustion before it causes swapping or OOM kills.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.2021.4.21 snmpwalk -v2c -c public <target> UCD-SNMP-MIB::memAvailRealX
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.2021.4.21.1 snmpget -v2c -c public <target> UCD-SNMP-MIB::memAvailRealX.1
Start monitoring Unix/Linux servers running the Net-SNMP (net-snmp/snmpd) agent (CPU/memory/disk/process-table status) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the UCD-SNMP-MIB::memAvailRealX OID value, configure state conditions and alerts, and monitor any Unix/Linux servers running the Net-SNMP (net-snmp/snmpd) agent (CPU/memory/disk/process-table status) from a single console.
OID Breakdown
Upper-level ancestors (6 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.2021 | ucdavis | UCD-SNMP-MIB |
| 1.3.6.1.4.1.2021.4 | memory | UCD-SNMP-MIB |
| 1.3.6.1.4.1.2021.4.21 | memAvailRealX | UCD-SNMP-MIB |