SSD for ZIL/SLOG?

[Rhinox]

I'm building small server with local storage using ZFS as file-system. As it is SSD-only, I suppose I do not need extra SSD for L2ARC, but I still need separate media for ZIL/SLOG. From what I have read, Intel-SSDs are ahead of competition, but I'm facing certain limitations.

Because my HW has neither U.2 nor free PCIe 4x slot, I have to stick with SATA. Sure Intel S3700/S3710 would be excellent choice, unfortunatelly my pocket is not very deep and I did not find S3700 for 100 bucks. So the list I can pick from is (size does not matter, even 80GB is more than I need):

S3500, S3510, S3520, and S3610

There is not much difference in price, they all cost about the same: ~100-120€ for 80-120GB versions. So my question is: which series out of the list is the best? I'd guess "higher number" is better, but surprisingly S3610 has quite low write-IOPS/4k: 82k/6.5k (for 100GB version). S3520/160GB has 43k/31k (I have read somewhere writing is more important for ZIL/SLOG). On the other side, the other two (S3500/S3510) have much lower TBW value (40-50TB, compared to 400-500TB for S3520/S3610).

So out of the above mentioned list, is the S3520 the best choice for ZIL/SLOG? Or is it yet S3610?

 

[T_Minus]

What SSD will the pool be made of? You might not need a SLOG device if you're using a # of SSD in raid10/pool of mirrors or your work load may not require it? Maybe tell us more about your workload, # of drives, and controller.

 

[Rhinox]

At the beginning 2x 500GB/SM863 in raid1 (later maybe 4x in raid10). Workload will be "mixed": Proxmox with a few VMs (KVM/LXC), a few websites with db, dns, mail, etc. Controller is on-board (X10SDV).

 

[Monoman]

You'll be fine without. Your sm863s are no slouch

 

[gea]

+1
Your SM863 are perfect for a pool without a dedicated slog as they offer high write iops, quite low latency with powerloss protection. A dedicated Slog would only be helpful if the pool itself come without powerloss protection or if a dedicated Slog is much faster than the pool.