Optimal configuration for FreeNAS

[spuser]

Please assist me with optimal configuration.
FreeNas run on Dell server with 2 CPU/40 Cores. 6 disk SAS15 900G and 2 disk SSD 400G for cache.
Network interface - 10G.

My Requarements:
Sharing option - NFS and SMB.
Connectivity from multiple Linux/Windows machines.
Most use - save logs and wireshark captures.

Thanks

 

[SweetAndLow]

You need 2 cores not 40, lol. Also make sure there is no raid card. You need a hba. There is also no need for the SSD cache device. You are just storing log files. How many clients? 10's? 100's? 1000's?

 

[spuser]

Server with 2 phisical cpu and 40 logical cores. sysctl -n kern.smp.cpus -> 40.
128 giga ram.
All disk's - no raid. FreeNas installed on usb disk.

~200 clients.
Why not use ssd as cashe?

 

[SweetAndLow]

i was saying that you have way to many cpu cores. that server you bought is for computation not storage. What kind of cache you want to use the ssd for? Read cache? Write cache? either way it won't do a thing to improve your performance.

 

[spuser]

Can you describe why cache not improve write performance?
What should be write performance with SAS 15 HDD and 10G link?

Thanks

 

[SweetAndLow]

do you know what a slog is? It's super obvious if you research it.

basically if you are doing sync writes it will improve speed. A slog cache device also has to be a device that supports power loss protection otherwise it defeats the purpose of it. So a normal ssd just doesn't work. What ssd do you have? Another thing to know is that writing log files does not need a sync write workflow. You are just storing data, not a big deal. So smb and nfs will not not sync writes in this case so your slog device would sit their idle.

 

[spuser]

Thanks.
My mistake. I mean logs - text files from SSH/RS232 terminals and pcap data.
SSD - 480GB Dell SATA Mix Use MLC 6Gbps.