SSD cache??? for a NAS

[LordGabeNisBae]

Sup peeps,

 

I have a nas setup with 3x10tb ironwolf drives(20tb usable, 10tb parity) with a samsung 850 evo 250gb cache drive.

 

I wanted to know if the quality and quantity of the storage provided by the 850 evo was worth it. I feel like it is overklill for the NAS as my network speeds are only Gigabit

 

I wanted to remove it and raid0 2 850evo 250s as the boot drive of my secondary pc with a 4tb hard drive, and move the 1tb ssd from that pc to my main rig to raid0 with my other 1tb drive as superfast local storage.

 

All my connections are gigabit so i was wondering if i was under using the SSD. I have a spare old toshiba 128gb ssd laying around which I could toss in instead but was worried if the cache drive needed to be of high quality. 

 

Do mechanical hard drives saturate gigabit lan? 

 

Regards

~GabeN

 

 

[fjdhdhcyfhf]

 

do hard drives saturate gigabit? Yep. Iv tested transfer speed of one drive, two and three in raid0. One is ok but shit random access. Two was a sweet spot for consistent speed. Three disks really saturated the gigabit and I don't see any point striping more than two drisks over gigabit. I did not test raid5 or zfs.

 

Ssd cache is good for a database or web server that serves lots of connections and gets lots of io. It basically adds the random access super powers of ssd to your drives. For home nas it does nothing. Iv tried it just to see what it was like to setup and I think it's a waste of an ssd. Think about it, is the ssd doing anything that your ram cannot? Is your io that demanding that your drives cannot keep up with the number of clients connecting?

 

i would put the os on that 128gb ssd and mount /var and /tmp and swap if needed on the mechanical drives. It's easier to do upgrades or reinstall if os is seperate from data. 

 

Do do you get anything from raid0 on ssd? Iv tried that too and I don't find it makes it faster. Again ssd has random access super speed, raid does not make random access faster in the same way it does with mechanical drives. I hear video editors like their raid0 on sata ssd