X10SL7-F zpools scheme, advice/aprove request

[GolDenis]

Home-made FreeNAS based on X10SL7-F project.

1. Going to make Zpool#1 based on 8 SATA (internal LSI 2308 SAS controller) in raidZ2 for critical data (document's backups & kids/family pictures&vdo) - 7 HDD (red WD 3Tb) & 1 empty SATA slot for hot-plug&change "if somthing"
2. Zpool#2 based on 4 SATA 2.0 in raidZ1 for uncritical data (movie/video/cartoon & other kid's sfuff) 4 HDD (WD 3Tb)
3. Zpool#3 based on 2 SATA 3.0 in raidZ0 - 2 SSD 120Gb mirrored boot SSD.

• Intel Xeon E3-1276 V3 LGA1150 CPU Processor
• 32Gb ECC DDR3 1600 MHz PC3-12800E 2RX8 CL9 Unbuffered DIMM Memory
• Fractal Design Node 803 case
• Corsair RM750I PSU

I'd appreciate any suggestions/confirmations.

 

[Jessep]

It would make more sense to do (2) x6 3TB RaidZ2 vdev in one pool. More space, more iops, more redundancy.

 

[GolDenis]

It would make more sense to do (2) x6 3TB RaidZ2 vdev in one pool. More space, more iops, more redundancy.

hm... what about mix SATA 3 (6Gbit/s) & SATA 2 (3Gbit/s) together in one pool?
I've been thinking about it... but... I don't have enough knowledge about this technology. I suspec, that when the SATA ports are mixed, the speed will be the determinated by slowest one.

 

[GolDenis]

It would make more sense to do (2) x6 3TB RaidZ2 vdev in one pool. More space, more iops, more redundancy.

How critical will be, that HDD speed drops from SATA3 to SATA2 in my case?
Or.... my NAS's bottle-neck will be a LAN port....for common use (exept system matters) and SATA 2 or 3 - that will be not very importatnt?

 

[Jessep]

SATA2 = 3Gbps = 375MB/s max theoretical
This would restrict SSD not HDD as most HDD do 150-225MB/s.

Yes your network will be the bottle neck if you use 1Gb ports at ~110MB/s.

 

[GolDenis]

SATA2 = 3Gbps = 375MB/s max theoretical
This would restrict SSD not HDD as most HDD do 150-225MB/s.

Yes your network will be the bottle neck if you use 1Gb ports at ~110MB/s.

Dear Jessep!
Thanks a lot!
The last question.
How would you split SATA2 between that 2 raidZ?

• Symmetrically? (2xSATA2+4xSATA3)х2
• Unsymmetrically? (6xSATA3) & (2xSATA3+4SATA2)

 

[Jessep]

If they are all well known stable ports (Intel chipset, LSI chipset) it shouldn't matter at all. The drivers for those chipsets will be stable and they will pass the correct information through to FreeNAS (SMART, etc.).

Other chipsets are more problematic.

You could look at the chipset motherboard diagram if you are concerned. Ports that hang off the chipset (PCH) would be better split between the 2 vdevs vs. ports that hang directly off the CPU or PCIe lanes that are off the CPU.

Here is your board layout, all the SATA ports are off the chipset so they all have to traverse the DMI II path. You should put your boot drives on the SATA 2 ports and split the rest between the LSI 2308 SAS ports and the remaining SATA ports.

DMI 2.0, introduced in 2011, doubles the data transfer rate to 2 GB/s with a ×4 link. It is used to link an Intel CPU with the Intel Platform Controller Hub (PCH), which supersedes the historic implementation of a separate northbridge and southbridge

 

[GolDenis]

Thank you very much indeed!