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RAID 0 VelociRaptor and ZFS questions

post #1 of 9
Thread Starter 
First Question

RAID 0 4 Velociraptors..... how would that perform?

Second Question

So i know how when a drive says like 1TB, u only get like 950 or so gigs to use.. I'm trying to figure out the right settings i need for my file server. The file server has 3 x 500GB and 3 x 3TB.

I understand to an extent that for example, if u get a 1 TB, only like 950mb is usable... or somethin like that... but when i have the 3 3TB drives set in ZFS.... 9TB became like 8TB free... so i lost 1TB ?!??
 
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post #2 of 9
Multiply 1TB by 0.93132 and you'll find the size in Windows.
1GB of data is 1024MB, but for the HDD industry, it's 1000MB. This is what causes confusion.
Edited by John-117 - 2/19/12 at 2:54am
    
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post #3 of 9
Thread Starter 
yah i understand that .. in the industry to make it simple for majority of the consumers, they changed it to a straight number, but in reality, its actually 1024kb, 1024mb, 1024gb, etc.

but even multiplying 9tb by 0.93132 is 8.38188 .. what happened to the .381TB D: lol
 
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post #4 of 9
Do you see the rest in disk management control for your ZFS thingy? It could be you just need to extend the partition.
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post #5 of 9
Quote:
Originally Posted by iandroo888 View Post

First Question
RAID 0 4 Velociraptors..... how would that perform?

Marginally better than four modern 7200rpm drives, for general use.

Noticeably worse than one good modern SSD for, general use.
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post #6 of 9
Thread Starter 
Quote:
Originally Posted by Sean Webster View Post

Do you see the rest in disk management control for your ZFS thingy? It could be you just need to extend the partition.

Nope. There is no control on how much to partition it or anything. Makes me wonder if it uses each disk partially and stores something untouchable?
Quote:
Originally Posted by Blameless View Post

Quote:
Originally Posted by iandroo888 View Post

First Question
RAID 0 4 Velociraptors..... how would that perform?
Marginally better than four modern 7200rpm drives, for general use.
Noticeably worse than one good modern SSD for, general use.

x_X
 
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post #7 of 9
If you are hosting larger files, or have few simultaneous users, it's going to be way more economical to get 7200rpm drives than velociraptiors (a 7200 rpm drive can't match the latter's access times, but it will best it in sequential transfers due to having platters with much greater areal density). Might also be better to keep them as single drives, as unless you have a 10+ gigabit network, even a single HDD will saturate it, and having stuff on independent disks will improve access times quite a bit; not sure if that is practical with ZFS though.

I did some reading into ZFS, and it uses checksums or hashing for increased data integrity. These may be responsible for some of the missing space you are seeing.
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post #8 of 9
Thread Starter 
well the velociraptors are used as an OS drive on a different computer but i wanted to just ask the question all on the same thread so i dont have to create more than one.

but thx for some info on the ZFS
 
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post #9 of 9
If it's going in a fileserver, then you probably want to store a ton of stuff on it. My fileserver has about 3TB of junk, and several million files. It wouldn't be economical for me to throw that data on SSDs.

When working with large numbers of files, the difference between 5400RPM, 7200RPM, and 10k RPM becomes very apparent.


Regarding capacity loss - most circular media is measured in metric gigabytes. (rather than the kind we've become accustomed to due to Windows/Microsoft) Be aware that every time you jump a prefix you the reported capacity drops. (931GiB = 0.909TiB, which Windows reports as GB/TB...)

Just take 1000000000000 (One metric TeraByte/TB) and divide by 1024 a few times to see how the number changes as you jump prefixes.
     
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FX-8350 @ 4.6ghz 1.425v Sabertooth 990FX Zotac GTX 1070 Amp! 32GB (4x8GB) Kingston Fury 1866mhz CL10 1T 1.5v 
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Hitachi 2TB - HDS723020BLA64 Crucial M500 960GB - CT960M500SSD1 WD 4TB Black - WD4001FAEX WD 4TB Black - WD4001FAEX 
Hard DriveHard DriveHard DriveHard Drive
Seagate 2TB - ST2000DM001 WD 640GB Black - WD6401AALS Seagate 6TB - ST6000DM001 Micron M500 - MTFDDAK480MAV 
Optical DriveOptical DriveOptical DriveOptical Drive
Pioneer DVR-115DBK Samsung SH-S243D/BEBE LG GH22NS90 Lite-On EBAU108 External DVD 
CoolingCoolingCoolingOS
Noctua NH-D15 Fractal Design 140mm Fan - FD-FAN-140 Fractal Design 120mm Fan - FD-FAN-120 Windows 7 
OSMonitorMonitorKeyboard
Ubuntu 14.04 LTS Samsung 2343BWX 23" (2048x1152) BenQ GW2765HT 27" IPS LCD Monitor (2560x1440) Genius Keyboard KB-G235 PA 
PowerCaseMouseMouse Pad
Seasonic Platinum 1000w PSU - SS-1000XP Fractal Design Define R5 Steelseries Rival 6500 dcpi Mousepad + Desk 
AudioAudioOtherOther
Onboard Realtek® ALC 892 Cyber Acoustics CA-2992 2.0 Speakers Razer Krait 1600 DPI nGear G-C1601 Card Reader 
OtherOther
Pisen Card Reader Gigabyte M7 Thor 
CPUMotherboardGraphicsRAM
VIA Eden C7 1200mhz Jetway J7F4K1G2ES-LF VIA Onboard 512MB PC2-4200 
Hard DriveOptical DriveCoolingOS
A-Data FlashDrive None Fanless Linux 
MonitorKeyboardPowerCase
Headless None 65w Power Brick Antec ISK300-65 
MouseAudio
None Onboard VIA 
CPUMotherboardGraphicsRAM
Barton XP-M 2400+ FJQ4C Asus A7N8X-E Deluxe 256MB BFG 7800GS OC 2x512MB Samsung PC3200 
Hard DriveOSMonitorKeyboard
Raptor 74GB/Seagate 120GB Windows 2000 Pro 60hz 17" CRT Brandless PS2 Keyboard 
PowerMouse
Antec Neo HE 550w Logitech G5 
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CPUMotherboardGraphicsRAM
FX-8350 @ 4.6ghz 1.425v Sabertooth 990FX Zotac GTX 1070 Amp! 32GB (4x8GB) Kingston Fury 1866mhz CL10 1T 1.5v 
Hard DriveHard DriveHard DriveHard Drive
Hitachi 2TB - HDS723020BLA64 Crucial M500 960GB - CT960M500SSD1 WD 4TB Black - WD4001FAEX WD 4TB Black - WD4001FAEX 
Hard DriveHard DriveHard DriveHard Drive
Seagate 2TB - ST2000DM001 WD 640GB Black - WD6401AALS Seagate 6TB - ST6000DM001 Micron M500 - MTFDDAK480MAV 
Optical DriveOptical DriveOptical DriveOptical Drive
Pioneer DVR-115DBK Samsung SH-S243D/BEBE LG GH22NS90 Lite-On EBAU108 External DVD 
CoolingCoolingCoolingOS
Noctua NH-D15 Fractal Design 140mm Fan - FD-FAN-140 Fractal Design 120mm Fan - FD-FAN-120 Windows 7 
OSMonitorMonitorKeyboard
Ubuntu 14.04 LTS Samsung 2343BWX 23" (2048x1152) BenQ GW2765HT 27" IPS LCD Monitor (2560x1440) Genius Keyboard KB-G235 PA 
PowerCaseMouseMouse Pad
Seasonic Platinum 1000w PSU - SS-1000XP Fractal Design Define R5 Steelseries Rival 6500 dcpi Mousepad + Desk 
AudioAudioOtherOther
Onboard Realtek® ALC 892 Cyber Acoustics CA-2992 2.0 Speakers Razer Krait 1600 DPI nGear G-C1601 Card Reader 
OtherOther
Pisen Card Reader Gigabyte M7 Thor 
CPUMotherboardGraphicsRAM
VIA Eden C7 1200mhz Jetway J7F4K1G2ES-LF VIA Onboard 512MB PC2-4200 
Hard DriveOptical DriveCoolingOS
A-Data FlashDrive None Fanless Linux 
MonitorKeyboardPowerCase
Headless None 65w Power Brick Antec ISK300-65 
MouseAudio
None Onboard VIA 
CPUMotherboardGraphicsRAM
Barton XP-M 2400+ FJQ4C Asus A7N8X-E Deluxe 256MB BFG 7800GS OC 2x512MB Samsung PC3200 
Hard DriveOSMonitorKeyboard
Raptor 74GB/Seagate 120GB Windows 2000 Pro 60hz 17" CRT Brandless PS2 Keyboard 
PowerMouse
Antec Neo HE 550w Logitech G5 
  hide details  
Reply
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