How To Store New Data On SSD'S Then Copying To Conventional Drives Over Night - FreeNAS

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ryan_123

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Apr 12, 2016
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Hey everybody

So my questions is, which I've been stuck on for quite a while now is. On FreeNAS can you store new data on SSD'S and the overnight when nobody's using the system copy the new files to conventional Western Digital Red Drives? I would like to use only one FreeNAS system/build with the two Western Digital Red drives in one array and two ssds in another array inside this one machine. If this possible I would be very grateful if you could reply down below.

Thanks in advanced

Ryan

 
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popatim
You wont get better read a write speeds. The LAN won't let you. It can't transfer that fast. You are always limited by the slowest part of the entire chain sadly and in this case its the LAN.

Unless you have many users streaming content simultaneously; the SSD's, capable of streaming 500MB/s, will be limited by the networks max speed (about 100MB/s for gigabit). When backing up the SSD's will now be limited by the other end of the backup, the HDD's, to about 150MB/s which is no where near the SSD's capability. The only benefit is when streaming more streams then the hdd's can handle simultaneously. so unless you will have more than 4 users (estimate from RED HDD stats) the hdds will work fine. Your gigabit network would be able to...
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popatim

popatim

Titan
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Dec 2, 2009
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Why would you put SSD's into a NAS when even a harddrive will be bottlenecked by your LAN?
I suggest you instead add in either two more RED drives and get more storage space or save money and not bother with 2 SSD's.

{Sorry to be blunt}
 
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ryan_123

Commendable
Apr 12, 2016
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But I wanted to have the SSD'S to transfer data to first so I get better read and write speeds. Then overnight when nobody is using the FreeNAS system put the new files onto the WD red drives.
 
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popatim

popatim

Titan
Moderator
Dec 2, 2009
38,904
980
135,890
You wont get better read a write speeds. The LAN won't let you. It can't transfer that fast. You are always limited by the slowest part of the entire chain sadly and in this case its the LAN.

Unless you have many users streaming content simultaneously; the SSD's, capable of streaming 500MB/s, will be limited by the networks max speed (about 100MB/s for gigabit). When backing up the SSD's will now be limited by the other end of the backup, the HDD's, to about 150MB/s which is no where near the SSD's capability. The only benefit is when streaming more streams then the hdd's can handle simultaneously. so unless you will have more than 4 users (estimate from RED HDD stats) the hdds will work fine. Your gigabit network would be able to handle about 6 simultaneous streams before you need bond two gigabit network cards and get a 2GB/s network (like raiding networks :) ) 6 streams certainly wont work an SSD very hard as its just out of the ability of a single HDD like the Red.

I have 6 drives in my NAS. I transfer to/from them at ~100-112MB/s on a dedicated gigabit ethernet line. I'm maxing out the network, not the drives speed
 
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