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September, 2013

Synology Memory Test and LACP

This is just a quick note to save anyone else time that might hit this.  The Synology DS Assistant tool (the one you used to install the DSM on your new NAS) also has a memory test function.  You need to enable this within Preferences of the tool.  Once you do that you can have it reboot your NAS and perform a memory test.  This is useful if you have a new NAS or upgraded the memory in an existing unit.  It’s something I highly suggest you use.

What I ran in to was that I use LACP (Link Aggregation Control Protocol) LAGs (Link Aggregation Groups) with one of my Synology boxes.  These let me group multiple NICs together for better throughput.  When the DS Assistant reboots the NAS to perform a memory test it doesn’t use your configured network setup.  It uses DHCP to grab an IP and just does a basic configuration (no LACP, no VLAN tagging, etc).  Therefore when it would reboot my switch couldn’t talk to it via LACP and none of the ports came up…and the DS Assistant wouldn’t see the NAS anymore and wouldn’t report status of the memory check.

So before you do this I advice breaking your LAGs or using an extra interface (if you have a spare one on the NAS) and connect that to your switch on a normal access port.  Just a heads up.

6 thoughts on “Synology Memory Test and LACP”

  1. UGH! So that’s why my memory test seemed like it took forever and never completed! I upgraded RAM in my DS713+ and thought it had something to do with the memory I installed. Thanks for posting this!

    1. Yeah. I never saw this noted anywhere but when my NAS rebooted it never reconnected to DS Assistant and I read someone else mentioning the status updates. After breaking one NIC from the lag the NAS would report status back to DS Assistant.

  2. Hi,

    thanks you for this trick / issue …

    One word about the memory test …

    Is this test enough / sure ? is it like memtest and ran enough time to detect long term error (temp or else) ?



  3. Thanks for investigating that – even the Synology support wasn’t aware of this issue. Is it save to shut down and reboot the System by the power switch at the front? And which System will boot then?

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