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Write speed between a raid 0 array and a sata II stand alone drive question

post #1 of 4
Thread Starter 
Hey everyone quick question about write speeds I am doing a large set of file transfers about 90gb and 100,000+ files and wondering if my write speeds are normal transferring from source drive which is a 1tb Western digital 7200 rpm drive to my raid array 2 640 Western digital 7200 rpm drives I got around 60 megabytes/sec give or take. Now transferring the other way after wiping the other drive it started out really slow for the first minute or too 1 -2 MB/sec and then built up to about 22MB/sec and is now sitting at 37MB/sec are these speeds normal for this type of transfer?
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post #2 of 4
Yes. You never get the raw speeds benchmarks advertise, because of the nature of files and filesystems.

First, your OS looks up where the file is... then it reads it... then it writes it, and then it writes a record in the MFT so it can find it again.
     
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post #3 of 4
Thread Starter 
thank you for that explanation so basically a lot of overhead in the process
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post #4 of 4
Basically.

It follows that procedure, in order, for every copy. Although it can cache the entire MFT to save one of the steps - it has to write MFT records every time it writes a new file. If it didn't, you'd have large gaps in time where a power failure or crash would destroy multiple files, and possibly lead to filesystem corruption.

Of course, there may be a way to get partially around it.

http://www.windowsreference.com/wind...s-server-2008/

But Windows still seems to favour keeping the queue very low - as close to zero as possible, so that if you suffer a power failure or BSOD, you lose at most a couple files.
     
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CPUMotherboardGraphicsRAM
FX-8350 Saberooth 990FX eVGA GTX 560 SE 4x4GB Corsair Vengeance 1600mhz 
Hard DriveHard DriveHard DriveHard Drive
WD 4TB Black - WD4001FAEX-00MJRA0 Seagate Momentus XT 750GB - ST750LX003-1AC154 WD Green 1.5TB - WD15EARS Hitachi 2TB 7200RPM - HDS723020BLA642 
Hard DriveHard DriveHard DriveHard Drive
WD 2TB Green - WD20EARX WD 2TB Green - WD20EARS WD Blue 500GB - WD5000AAKS-00V6A0 WD Scorpio Black 500GB - WD5000BEKT-00KA9 
Optical DriveOptical DriveOptical DriveCooling
Pioneer DVR-115DBK Samsung SH-S243D/BEBE LG GH22NS90 Coolit Eco R120 
CoolingCoolingOSOS
Yate Loon Fans - D12SL-12-RED/BLACK Fractal Design 120mm Fan - FD-FAN-120 Windows 7 Ubuntu 10.04 LTS 
MonitorKeyboardPowerCase
Samsung 2343BWX 23" (2048x1152) I-Rocks KR-6170-BK Corsair HX620 Fractal Design Define R3 
MouseMouse PadAudioAudio
Razer Abyssus 3500DPI Mousepad + Desk Onboard Realtek® ALC 892 Cyber Acoustics CA-2992 2.0 Speakers 
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Razer Krait 1600 DPI nGear G-C1601 Card Reader Pisen Card Reader 
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 
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Raptor 74GB/Seagate 120GB Windows 2000 Pro 60hz 17" CRT Brandless PS2 Keyboard 
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