Synology 1520+ Plex memory leak 4gb+ at idle

Plex Media Server NAS & Devices
1

Server Version#: Version 1.26.0.5715
Dsm 6.2.4

I noticed that after a few days my memory use was 60% (over 4gb) and Plex was the culprit. I installed a 16gb stick and it’s still showing 4gb memory use at idle and no use for over 5 days. I do to recall this on the prior 1.25 version I upgraded from. If I restart Plex I get no ram use until a few days later then it’s back at 4-5gb use even if I don’t use Plex during those days. I have nightly metadata update set and think during this process it’s using ram and then over the days it keeps compounding until it hits this 4-5gb range where it stops.

2

First, That 16GB stick isn’t doing you any good.

The CPU cannot address more than 8GB.

Proper RAM configuration is 2x 4GB matched sticks.

It doesn’t matter what DSM reports. It matters what the CPU can use.
DSM doesn’t know the limits of the CPU so it will simply total the RAM sticks and display it.

Where you’ll get in trouble is if DSM tries to use more than 8GB. When that happens, the kernel will start overwriting memory from other processes – which will cause it (DSM) to crash and very likely corrupt data on the volume.

Do you have the DLNA server enabled? If so, disable it. it’s a known memory leaker that Engineering hasn’t been able to find.

3

I checked and have DLNA server is off. I just updated to 1.27 and will check again in a few days if I have this issue. It seems it starts during the nightly server maintenance cleanup I scheduled for plex.

4

I do urge you to remedy the incorrect RAM DIMM size you’re using.

It will cause memory problems and easily could be contributing to this.

Maximum memory for this CPU is 2x 4GB sticks.

5

is that a synology thing?
i have a self build NAS using the ASROCK J4125-ITX motherboard that does support 16GB.
this is the official Memory QVL from asrocks site for the motherboard
ASROCK Memory QVL

6

@fallenczar

No, it’s not Synology. It’s the limit of the CPU as defined by Intel.

Memory Specifications

Max Memory Size (dependent on memory type): 8 GB
Memory Types:                               DDR4/LPDDR4 upto 2400 MT/s
Max # of Memory Channels:                   2
ECC Memory Supported:                       No
7

I disabled DLNA and it appears to have resolved the memory leak issue and speeds up media loading on players.

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