Forum Discussion

Tutor

Oct 06, 2016

snmp issue with 6.6.0

Since upgrading to 6.6.0 I'm no longer able to monitor disk usage using snmp. I've been using cacti to graph my 312 for the last 2 years. The system disk and the two disk in the NAS no longer app...

Installation & Upgrade

SNMP

aaron_gc

Initiate

Nov 28, 2016

There is something strange going on here. I have given Netgear the benfit of doubt and loaded the MIB file that came with the 6.6.0 firmware update.

After executing snmpwalk -c **** -v2c -m "READYNASOS-MIB.txt" ip_address_of_netgear I still was only able to see the following paths

RFC1213-MIB::mib-2.25.2.3.1.3.33 = STRING: "/"
RFC1213-MIB::mib-2.25.2.3.1.3.36 = STRING: "/dev/shm"
RFC1213-MIB::mib-2.25.2.3.1.3.37 = STRING: "/run"
RFC1213-MIB::mib-2.25.2.3.1.3.38 = STRING: "/run/lock"
RFC1213-MIB::mib-2.25.2.3.1.3.39 = STRING: "/sys/fs/cgroup"
RFC1213-MIB::mib-2.25.2.3.1.3.56 = STRING: "/media/USB_HDD_5"
RFC1213-MIB::mib-2.25.2.3.1.3.57 = STRING: "/run/nfs4/media/USB_HDD_5"

This aligns with a standard SNMP Walk without the MIB File

HOST-RESOURCES-MIB::hrStorageDescr.1 = STRING: Physical memory
HOST-RESOURCES-MIB::hrStorageDescr.3 = STRING: Virtual memory
HOST-RESOURCES-MIB::hrStorageDescr.6 = STRING: Memory buffers
HOST-RESOURCES-MIB::hrStorageDescr.7 = STRING: Cached memory
HOST-RESOURCES-MIB::hrStorageDescr.8 = STRING: Shared memory
HOST-RESOURCES-MIB::hrStorageDescr.10 = STRING: Swap space
HOST-RESOURCES-MIB::hrStorageDescr.33 = STRING: /
HOST-RESOURCES-MIB::hrStorageDescr.36 = STRING: /dev/shm
HOST-RESOURCES-MIB::hrStorageDescr.37 = STRING: /run
HOST-RESOURCES-MIB::hrStorageDescr.38 = STRING: /run/lock
HOST-RESOURCES-MIB::hrStorageDescr.39 = STRING: /sys/fs/cgroup
HOST-RESOURCES-MIB::hrStorageDescr.56 = STRING: /media/USB_HDD_5
HOST-RESOURCES-MIB::hrStorageDescr.57 = STRING: /run/nfs4/media/USB_HDD_5

I have attached 3 USB Storage Devices which I can see only 1 and I'm also missing the main Partion on the RAID

I'm not sure if this is deliberate to prevent NMS from accessing the appropriate data, but there has certainly been a change or introduced bug

aaron_gc
Initiate
Dec 03, 2016
How to use SSH to monitor your Netgear NAS

For full disclosure, I'm a PreSales Engineer for Paessler AG in the APAC region. Paessler develops a Network Monitoring Solution called PRTG Network Monitor - https://www.paessler.com/

You can download the trial version, which converts to a 100 Sensor Freeware version after 30 days (100 sensors @ 10 devices).

I was able to see all me disks by using the SSH Disk Free Sensor - https://www.paessler.com/manuals/prtg/ssh_disk_free_sensor as illustrated below; (you will need to ensure that SSH is enables on the NAS)

Hopefully this will be a work around until the missing OIDs have been returned.
iany
Guide
Dec 08, 2016
+1 here.
my array is not visible in neither Observium, nor plain snmpwalk...
given the fact I upgraded to 6.6.0 solely to be able to configure SNMP location, I'm really impressed by the fact that I lost the most important functionality in return to this capability...
- a-j-m
  Tutor
  Dec 11, 2016
  Done a bit more digging, Readynas 6.5.2 to 6.6.0 included an upgrade to Debian 8, Jessie. The snmpd version shipping with debian Jessie dropped support for btrfs file systems, this is a bug and has been fixed. There is a fix in later versions of snmpd 5.7.3+, currently installed 5.7.2.1+dfsg-1
  
  http://lists.alioth.debian.org/pipermail/pkg-net-snmp-devel/2015-December/001680.html
  https://sourceforge.net/p/net-snmp/bugs/2502/
  
  It'll probably just work when they upgrade to Stretch, but that's probably going to be a while. Between now and then we'll have to hope that snmpd is upgraded in a Readynas update.
  - a-j-m
    Tutor
    Dec 29, 2016
    I've fixed this on my NAS, used some of my spare time over the holidays.
    
    I built a Debian Jessie VM (amd64) and then followed the build instructions here to rebuild snmpd
    
    https://wiki.debian.org/SNMP
    
    apt-get build-dep snmpd
    cd /usr/src
    apt-get source libsnmp-base libsnmp5 snmpd
    edits as below then
    debian/rules binary
    
    Used the source patch here to edit the source
    https://sourceforge.net/p/net-snmp/bugs/2502/
    
    edited the debian/rules to add --enable-ipv6 as it was building without IPv6 support for some reason.
    
    Copied the .deb files to my nas and installed (dpkg -i ...) it's all working fine now and I don't seem to have broken anything.
    libsnmp30_5.7.2.1+dfsg-1_amd64.deb
    snmpd_5.7.2.1+dfsg-1_amd64.deb
    
    snmpwalk results for before and after patch as closely as I'd expect and I can see the btrfs data now.
    
    All my data is backed up elsewhere, I suggest you do the same before trying this.