2 SSDs as cache - Striped?

Percy

New Member
Feb 4, 2018
6
2
3
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I have 2x 512Gb Samsung 860 PRO drives (MLC) ready to go in to my pool of spinning disks as cache.
But I wonder what the best set up would be for this. I want to have both write and read cache but to be able to max out my 10gbe connection they need to be striped.

So should i stripe these drives before I add them to the pool via the motherboard or is there another way I should go about this.

I'm not sure what happens if i add the 2 drives to the pool, I don't think it stripes the drives automatically, or?
 

wolfgang

Proxmox Retired Staff
Retired Staff
Oct 1, 2014
6,496
496
103
Hi,

the Samsung 850Pro was very disappointing as ZIL and I think also the 860 Pro will be.
Because all prosumer SSD have no good 4k sync capacities.

I would recommend you SSD like the Samsung SM883 or the Intel DC S4610 or any other SSD at this enterprise level.
If you use a slow SSD (Slow means bad 4k sync capacities) your system gets slower and not faster.
 

wolfgang

Proxmox Retired Staff
Retired Staff
Oct 1, 2014
6,496
496
103
Yes, I forgot about the optane.
It works great and has the lowest latency.
 

wolfgang

Proxmox Retired Staff
Retired Staff
Oct 1, 2014
6,496
496
103
But consider if you have a home lab the ZIL boost only the small sync writes.
All large writes like video data will be written directly.
Also, a ARCL2 is only necessary if you have a real huge ZFS data pool.
ARCL2 consume memory what you can better use for ARC and Memory are always faster than a fast SSD.
 

Jarvar

Member
Aug 27, 2019
203
8
23
Any follow up on these? I am thinking of building a Proxmox box as well. I am considering both of those Samsung SM883 and the Intel DC S4610 drives. Only thing is that the Intel is TLC and the Samsung is MLC. Other than that I heard their performance is similar and the Intel's have been rock solid in the Enterprise domain.
 

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