SYNOLOGY-SPACEIO-MIB

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Organization: www.synology.com

Last Updated: 2013-09-11

Category: Storage

Description: Monitors Synology NAS storage space I/O throughput, latency, and volume utilization metrics.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

What Is SYNOLOGY-SPACEIO-MIB?

SYNOLOGY-SPACEIO-MIB is a Synology proprietary MIB for Synology NAS (network-attached storage) appliances, exposing per-volume/per-device storage I/O throughput, latency, and load metrics for the DiskStation/RackStation product lines. It provides a space-I/O table keyed by storage device, reporting bytes and operations read and written along with load-average-style figures over multiple time windows. Its monitoring emphasis is on storage subsystem performance and software status: tracking read/write throughput and operation counts, plus load averages over 1/5/15-minute windows, lets an admin spot a volume becoming I/O-bound or overloaded, which often precedes slow file access or degraded RAID rebuild performance. It is a Synology-specific extension used alongside Synology's broader system-health MIBs (covering disk/RAID/temperature/fan status) for full NAS monitoring. It is deployed on Synology NAS units in SMB and home-lab environments where storage performance needs SNMP-based visibility, which is exactly what SYNOLOGY-SPACEIO-MIB SNMP monitoring provides for these devices.

IPNetwork Monitor allows you to monitor SNMP objects defined in SYNOLOGY-SPACEIO-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Synology NAS appliances (DiskStation/RackStation)

Monitoring Examples

An admin would poll spaceIOTable/spaceIOEntry (indexed by spaceIOIndex, identifying the device via spaceIODevice) to read spaceIONRead/spaceIONWritten and spaceIOReads/spaceIOWrites for throughput trends, and spaceIOLA1/spaceIOLA5/spaceIOLA15 to see 1/5/15-minute I/O load averages — a sustained high spaceIOLA15 alongside falling throughput signals the volume is becoming a storage I/O bottleneck. This would prompt investigation into disk health or workload rebalancing before user-facing file access noticeably slows.

What Can Be Monitored

storage I/O read/write throughput
read/write operation counts
1/5/15-minute I/O load average
per-volume/device I/O identification

Imported Objects

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE
enterprises

From SNMPv2-TC

DisplayString

How to Use in IPNetwork Monitor

Example using spaceIONRead OID:

Select a Synology NAS appliances, DiskStation/RackStation (per-volume storage I/O throughput/load) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type spaceIONRead into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of bytes read from this device since boot. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
synology	1.3.6.1.4.1.6574
spaceIO	1.3.6.1.4.1.6574.102			Characteristics of the space io information
spaceIOTable	1.3.6.1.4.1.6574.102.1		not-accessible	Table of IO devices and how much data they have read/written.
spaceIOEntry	1.3.6.1.4.1.6574.102.1.1		not-accessible	An entry containing a device and its statistics.
I32 spaceIOIndex	1.3.6.1.4.1.6574.102.1.1.1	Integer32	not-accessible	Reference index for each observed device.
STR spaceIODevice	1.3.6.1.4.1.6574.102.1.1.2	DisplayString	read-only	The name of the device we are counting/checking.
C32 spaceIONReadEx	1.3.6.1.4.1.6574.102.1.1.3	Counter32	read-only	The number of bytes read from this device since boot.
C32 spaceIONWritten	1.3.6.1.4.1.6574.102.1.1.4	Counter32	read-only	The number of bytes written to this device since boot.
C32 spaceIOReads	1.3.6.1.4.1.6574.102.1.1.5	Counter32	read-only	The number of read accesses from this device since boot.
C32 spaceIOWrites	1.3.6.1.4.1.6574.102.1.1.6	Counter32	read-only	The number of write accesses to this device since boot.
I32 spaceIOLA	1.3.6.1.4.1.6574.102.1.1.8	Integer32	read-only	The load of disk (%)
I32 spaceIOLA1	1.3.6.1.4.1.6574.102.1.1.9	Integer32	read-only	The 1 minute average load of disk (%)
I32 spaceIOLA5	1.3.6.1.4.1.6574.102.1.1.10	Integer32	read-only	The 5 minute average load of disk (%)
I32 spaceIOLA15	1.3.6.1.4.1.6574.102.1.1.11	Integer32	read-only	The 15 minute average load of disk (%)
C64 spaceIONReadX	1.3.6.1.4.1.6574.102.1.1.12	Counter64	read-only	The number of bytes read from this device since boot.
C64 spaceIONWrittenX	1.3.6.1.4.1.6574.102.1.1.13	Counter64	read-only	The number of bytes written to this device since boot.
spaceIOConformance	1.3.6.1.4.1.6574.102.2
spaceIOCompliances	1.3.6.1.4.1.6574.102.2.1
spaceIOCompliance	1.3.6.1.4.1.6574.102.2.1.1			The compliance statement for space IO entities which implement the SYNOLOGY SPACEIO MIB.
spaceIOGroups	1.3.6.1.4.1.6574.102.2.2
spaceIOGroup	1.3.6.1.4.1.6574.102.2.2.1			A collection of objects providing basic information of an synology space io entity.

RFC description

MIB for Synology storage IO device characteristics and read/write statistics.

Start monitoring Synology NAS appliances, DiskStation/RackStation (per-volume storage I/O throughput/load) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

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