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Raid - Page 2

post #11 of 12
Guys, how many HDD do i need to set up RAID 10 (RAID 1+0)?
post #12 of 12
For RAID10 you need a minimum of 4 drives, as you are basically creating a RAID1 array and then mirroring it, giving you two RAID1 arrays with improved pperformance. You can use 4, 6, 8, 10, etc drives, as long as it's 4 or more. If you want speed AND redundancy, you may want to consider RAID5, which uses 3 or mmore drives but gives you more capacity (RAID5 = # of drives - 1, RAID10/1+0/01/0+1 = # of drives / 2). So, if you have 4 1TB drives, each type of(common ) array would look as such: RAID... 1 = 1TB, 0 = 4TB, 10 = 2TB, 5 = 3TB (approximately).
RAID1 is the safest but hurts write speed while boosting read speeds a bit.
RAID0 is the least safe but gives the biggest performance boosts by far in both read and write.
RAID10 is a mix of both of them, with a significant boost in read but very little write gains (IME, using MB controller, write speeds = RAID1 - 10-20%; with a realHHardware RAID setup, though, it's far faster).
RAID5 is safe (any single drive dies, you can rebuild the array w/o data loss, but wait too long and a second dies before you replace the first, you are SOL), and it is also quite fast with reads, but write performance depends strongly on the way the array is implemented; via MoBo controller it will eat up CPU power to write the parity stripes, but if you get a RAID Controller Card with a Battery Backup your speeds will skyrocket as the processor on the card willtake tthe load entirely off the CPU, and the card's on board cache allows for data to be put in a "wait line" thus relieving the CPU's congestion while the RAID chip processes the data.
RAID50 is essentially a mirror of parity, in that you have two identical RAID5 arrays (one mirrors the other), and while it is one of the safest arrays by far (RAID6/60 may be better in some circumstances, but I don't use it), but you still get the humongous read speeds with the same write penalty as regular RAID5 amplified to the same degree as there are drives. You should never try to do this from the MB controller, and thankfully most don't even permit it, as it will dominate your CPU whenever you havea llot of data transfer to do.

That said, if you can afford a good RAID card (at least 2x SAS ports thus 8x SATA though 3-4x is better, PCIe x8 ideally but x4 is okay for smaller array cards, a good amount of cache such as 512MB or even 1GB DDR2/DDR3, and the option to install a Battery Backup Unit as the BBU is almost always required to be able to fully utilize the card specifically the cache, and it has a profound effect on write speed), you can run RAID0,1,5,6,10,50,60 and possibly even the ones that are uncommon (although why you'd want to, I don't know).
Be prepared to spend $400-600 for a "decent" RAID Controller Card + $100+ for the BBU, and $1-1.4k for a really amazing one. However, if you have a PCI slot, the Dell-derived PERC5/i cards can be had for insanely low prices... There are two in the Marketplace right now, one "basic" for $50 and one with all the goodies (incl BBU) for $90. Either one is a good choice, and I am considering grabbing the second one myself, but I would unfortunately have to use it in a PC other tha my newest build (33930K/Rampage 4 Extreme/16GB DDR3-2133 9-10-9-27/256GB SAMSUNG 830/ETC), as the R4E doesn'thhave a PCI slot :'(
would be beastly for my HTPC and it's TV Tuner card, as I have been wanting to get my "DVR" space up to 20-24TB as while 8TB is nice, I need (err, want) to be able to store the thousands of hours of 1080p video uncompressed as the artifacts from compression bug me like crazy after buying such a great TV, 55" LG LED-LCD 240hz local-dimming with RGB "Smart-TV", with almostzzero bezel).

Anyway, sorry for the long reply, I guess I am just extra-rambling-y this morning. Best of luck, hope you find something helpful in my reply smile.gif
   
Z77 Bench-a-lot
(31 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K @ 4.92Ghz Asus Rampage 4 Extreme EVGA GTX670 FTW 2GB  EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 
GraphicsRAMHard DriveHard Drive
EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
Hard DriveHard DriveHard DriveHard Drive
WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
OtherOtherOtherOther
Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
OtherOtherOther
Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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Z77 Bench-a-lot
(31 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K @ 4.92Ghz Asus Rampage 4 Extreme EVGA GTX670 FTW 2GB  EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 
GraphicsRAMHard DriveHard Drive
EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
Hard DriveHard DriveHard DriveHard Drive
WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
OtherOtherOtherOther
Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
OtherOtherOther
Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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