Raid Z2 Sequential Write Speed

[Justin Aggus]

What type of sequential write speed is FreeNAS capable of in Raid Z2?

X5650 CPU
64GB ram

Say 1 Vdev in Raid Z2 with 10 Hard drives
And Each HD capable of 100MB/s individually

Large files, Via SMB

With an LSI card + BBU and Writeback enabled, I would expect to get fairly close to 800MB/s (Same 10 HDD's in Raid6)
With Windows Storage spaces, probably only about 100MB/s (Same 10 HDD's in Dual Parity)

 

[joeschmuck]

It's my impression that you already have this system setup from another thread, I could be wrong. Why don't you test it out? I also see a flaw in your question, you asked about the speed writing over SMB so your limitation would be the interface, also you said sequential while referring to ZFS which is not really a sequential file system.

If you are talking just an internal write.read speed within the FreeNAS system then you can test that too but that is not SMB nor over any interface. What type of interface are you getting 800MB/s over for SMB?

 

[Justin Aggus]

Nope, I haven't set this up yet, the drives are still in use elsewhere right now.

It's just 10gb lan nothing special.

 

[joeschmuck]

Hey, 10gb lan is better that what I got. I'm too old and cheap to spend the money. Your NIC could be the limitation, some work better than others under FreeNAS.