Synology NAS Cache Hi all, Synology do an Add-on card for Cache storage. So, as I’ve noticed recently that machines are hanging when creating new folder on NAs drive i.e. it waits and...

[kev2021]

think the M2D18 is cheaper but just need to compare the 2 to see which is better and if I’d gain by getting the better one or not as I suspect when I buy a replacement in a few years, the card wont be compatible etc.

Kev

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[UK Sentinel]

So I had a chat with a Server/Storage team today and whilst I was online, I asked them about your Cache cards and redundancy etc.

Firstly, they said – Need to have a UPS….

Then as far as the cache card, the M2D20 is better as it has a larger heatsink and can handle much more data read/writes than the M2D18 etc.

The guys did say, that if the cache card writes data to the SSD ( PCIe Cache disks) , then if power drops, data (cache) written to the SSD should remain.

But often, if power drops for any reason, this can cause SSD disk failures and corruptions etc, then this is when cache written to SSD could be lost.

It was a high lever conversation but did sound as though if power does drop, in theory, the cache should not be lost if it has been written to the cache SSD disks

A UPS will enable a safe and managed shutdown if power does drop and is highly advisable

Hope that helps and I will add it to your bill

 

 

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[kev2021]

Hi,

Great news, thanks for asking and the advise.  Yes, I was leaning more towards the M2D20 card as it is the newer version so should be supported for longer and like everything, they always improve things.

Yes, I was expecting it to remain in on the SSD but as they call it a cache, I figured it would of been lost.  Still trying to find out how often it writes its data from Cache to HDD can’t determine if its instant or every x period of time.

Will keep looking.

Thanks for the info, much appreciated!

Had my eye on a new NVMe drive today – saw a good deal on amazon prime day for one I was after BUT having checked my case, I have discovered a issue…. the 2nd on-board nvme slot is literally right underneath my gfx card…. and I’m not sure I have enough room to fit the NVMe card and heatsink……

Started looking at a cheap possible PCIe NVMe card to place in my remaining x16 PCIe slot BUT then I saw some cards need bifurication which my MB doesn’t support so decided to shelve the idea till a later date.

Kev

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[UK Sentinel]

Cache can be a misleading term, as from a PC perspective there is L1, L2, and L3 Cache ?.

Cache from a computer perspective means – “short-term computer memory where information is stored for easy retrieval.”

As the PCIe NVMe card will be writing the data (cache) to SSD’s, then it should not be lost after power failure.

If only everything worked as it should do in theory

In a completely sane world, madness is the only freedom (J.G.Ballard).

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