Adding 2 ssd for both slog and l2arc

D

dsh

Well-Known Member
Jul 6, 2016
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Hello,

I have a server with E5 2620 v4, 64GB ram and 4x1tb mushkin Reactor SSD (I know it's consumer grade but it's in ZFS striped mirrored, aka raid 10). Overall I'm happy with performance but I still see 5-15% IO delay during peak load. CPU usage always around 20-40% and RAM is 80-90% all the time.
So I am going add second E5 cpu and another 64gb ram.

Reading at forums seems like Intel s3710 is best SSD for slog. So I am buying two S3710. Then I want divide into two partions each then running first partion(slog) in mirrored mode and second partion (l2arc) in striped mode, hoping it will be two times faster.

Is it possible? Do you see any flaw with this configuration?
 
Is your write load synchronous? If not, you will not gain any speed at all, because only synchronous write are forwarded to ZIL. Consumer grade SSDs are generally not a good idea because of their very bad write performance and their relatively fast wearout. Please monitor this, ZFS on a consumer grade 750 EVO with Proxmox VE ripped 30% off in one month in my testlab.
 
Thank you for your answer. It is synchronous.
I am thinking using s3710 as SLOG would help consumer ssd's write performance. I do weekly monitor for ssd wear outs and do scrub.
Anyway I decided go with aforementioned upgrade. Hopefully get better performance. I will post result whenever it's upgraded.
 
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