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When write cache 100% full, speed is slow


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I noticed after the SSD write cache is full, I can no longer get 500mb/s speeds(I'm running 10Gbe). I am also starting to get errors when transferring files.

 

Is there a way to purge the cache?

 

 

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Edited by test4321
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Just saw this in this document:

https://global.download.synology.com/download/Document/Software/WhitePaper/Firmware/DSM/All/enu/Synology_SSD_Cache_White_Paper.pdf

 

Still really doesn't say anything about manually flushing the cache.

 

They should have done is where half of SSD cache is for read and half for write and you could flush write cache any time manually.

 

I believe Unraid actually flushes it's write cache automatically.

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Edited by test4321
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FYI:

 

removed the write-cache and just made one drive to be for tranfers and one for read cache.

 

If you remove write cache, synology will stop all your services.

 

One of the problems getting those services back online is that PostgreSQL service will need to be started manually from SSH.

 

Login into your box via Putty and run these commands:

 

1. sudo synoservice --start pgsql
2. sudo synoservice --start synoindexd

 

Then you will be able to restart your services (begin with Synology Application Service)

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