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iSCSI performance estimate

post #1 of 19
Thread Starter 
I'm looking to move all my mechanical storage to a FreeNAS based DIY NAS:
  • 4790K (not sure about clocks yet - might underclock for noise/power usage)
  • 16GB DDR3
  • Samsung 840 Pro 256GB as cache/ARC2L
  • 4x WD Red 3TB in RAIDZ
  • dedicated 10Gbit SPF+ connection between my main rig & my NAS

Main rig will consist of:
  • Coffee Lake 6c i7 OC'd
  • 16 or 32GB DDR4 (not sure yet)
  • 1TB NVMe
  • dedicated 10Gbit SPF+ connection between my main rig & my NAS

My main rig would have a 1TB SSD for OS; most used software; most games etc. A 1TB SSD does however not suffice to store all my data & software (rest of my steam library for example); so I was thinking of dedicating about 2TB of storage from on my NAS as an iSCSI array to link with my main system. From what I've read; a RAIDZ array with these drives should natively land somewhere between 200 and 300 MB/s sequential reads. The 2TB pool will mostly be used for passive data storage that won't see use often.

Is it achievable to for example load a modern title (Rise of The Tomb Raider as an example) of a iSCSI array without waiting 2 minutes of each loading screen?
Will it still be in the same ballpark a single drive that's connected via SATA in my main rig? What kind of read performance hit am I looking at? Writes don't worry me that much; it's mostly read-only storage.

Is this achievable over iSCSI; with a 10Gbit connection?


Thanks!
 
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post #2 of 19
Thread Starter 
To ze top
 
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post #3 of 19
Thread Starter 
Euhm... Anyone? redface.gif
 
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post #4 of 19
Thread Starter 
OCN



Has no one here run iSCSI over 10G got to give me a performance estimate? rolleyes.gif
 
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post #5 of 19
Quote:
Originally Posted by xioros View Post

OCN



Has no one here run iSCSI over 10G got to give me a performance estimate? rolleyes.gif

the only SCSI hardware i've touched or seen was from the late 90s early 20s when cleaning junk out of the store.

EDIT: some thoughts cross my mind, like fibre channel or infiniband, idk if 10gbps fC is a thing and weather or not it would be faster than normal 10gbps fiber network, also flash storage might make it faster? i have yet to get my 10gbps network up and going let alone my esxi server's VMs going on it's raid 6.
Edited by cdoublejj - 8/23/17 at 4:51pm
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post #6 of 19
I worked in a datacenter in the 90s that had all SCSI in the servers. Fastest drives available at the time. However, how that would work in an iSCSI array running games from a NAS, is probably not something many people currently have direct experience with. Set it up and inform us how it goes.
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post #7 of 19
Thread Starter 
For clarification, I'm talking about the SCSI over Ethernet protocol.

Are there better alternatives that minimize performance impact when connecting to storage over Ethernet? Should I just go with NFS? I'm new to this stuff. Only a single client will have access to the volume.
As in: what's the most efficient way to utilize storage over a 10Gbit or 20Gbit Ethernet connection?

I'm currently looking into running it on a pair of Intel X540-T2's because I was able to pick up one for just €15 (working on an ASUS H110 board I tested it with, but won't play along with Z87/Z97 - known issue with this particular version: came from a Dell server and it has something to do with UEFI/firmware). My alternative is SPF+ with either copper or fiber.
 
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post #8 of 19
@OP

First and foremost, iSCSI is SCSI over IP, which in turn runs over whichever hardware your IP stack has support for - Ethernet, Infiniband, WiFi - and yes, you can route iSCSI over the public Internet. In terms of performance in your environment, 10Gb will be more than fast enough in terms of raw bandwidth (make sure to enable Jumbo Frames) but latency will likely be higher than a SATA drive. High enough to be noticeable? No idea, so go set it up and report back. biggrin.gif
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post #9 of 19
Thread Starter 
Quote:
Originally Posted by parityboy View Post

@OP

First and foremost, iSCSI is SCSI over IP, which in turn runs over whichever hardware your IP stack has support for - Ethernet, Infiniband, WiFi - and yes, you can route iSCSI over the public Internet. In terms of performance in your environment, 10Gb will be more than fast enough in terms of raw bandwidth (make sure to enable Jumbo Frames) but latency will likely be higher than a SATA drive. High enough to be noticeable? No idea, so go set it up and report back. biggrin.gif

So I take it the protocol overhead is acceptable?
Cheers. I'll be using either 2 dual 10Gb Intel RJ45 NICs or a single Mellanox ConnectX 2 with a direct link. Both should support the protocols.
 
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post #10 of 19
Quote:
Originally Posted by xioros View Post

So I take it the protocol overhead is acceptable?
Cheers. I'll be using either 2 dual 10Gb Intel RJ45 NICs or a single Mellanox ConnectX 2 with a direct link. Both should support the protocols.

what do you mean by protocol overhead?

also i have heard jumbo frames can affect other things, so we might assume on this particular network this nas will be all that's on it and or that most things don't care/ or are not adversely affected by jumbo frames?
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Alienware M17x-R4
(18 items)
 
Core 2 Haf
(17 items)
 
 
CPUGraphicsRAMHard Drive
i7-3920XM GTX980M G.SKILL Ripjaws 32GB Model F3-1866C10Q-32GRSL Samsung SSD 850 EVO mSATA 1TB 
Hard DriveHard DriveHard DriveOptical Drive
WD Blue 5400 RPM 1TB ODD Conversion w/ White Label 2TB Empty / Free Bay Converted External USB 
CoolingCoolingOSMonitor
M14x R2 10 CFM CPU fan Liquid Metal Pro Windows 10 /w Telemetry Block  1080p 120Hz eDP 
MonitorKeyboardPowerMouse
Sony FW900 @ 2304 x 1440 @ 80hz Saitek Eclipse I Dell 330 Watt Brick Logitech G500s 
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Intel Dual Band Wireless-AC 7260 w/ BT iGPU disable / bypass 
CPUMotherboardGraphicsRAM
C2Q Q9550 ASUS P5E3 Deluxe Wifi-AP EVGA GTX 770 4GB Classified Kingston HyperX DDR3 KHX1600C9D3K2/8G 
RAMHard DriveCoolingOS
PNY 1333 55gb, 320Gb, 500GB, 1TB Corsair H80 Win 7 Ultimate 64bit 
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