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Thread Starter 
Hello

I am planning to build 6x2TB RAID 6 array.

My NAS is as following:
Athlon II X2 250
4GB DDR3
Gigabyte 870A-USB3
Ati X600 128MB
HP P400 SAS controller 256MB
Pentagram Silent Force 460W PSU
EVER 420W UPS(pure sine wave)

OS is Debian 8.2.0 X64

What I want to know is how exactly RAID 6 works on this card.

According to the following:
https://www.hpe.com/h20195/v2/GetPDF.aspx/c04111741.pdf

RAID 6 requires an additional battery for operation.

However I am unsure if I need 512MB cache module too.
Quote:
Modular, easy-to-upgrade design lets you optimize performance by upgrading from 40-bit 256MB cache to 72-bit 512MB battery-backed write cache (BBWC)
There is some kind of connector at the end of current 256MB cache.
I don't really need the extra cache but if 512MB cache is required then it would be cheaper for me to purchase another P400 bundled with battery than purchase battery + 512MB module separately.

Another thing I'm considering is a way to trick controller into thinking that the battery is connected.
I would need at least a bit of information about the construction of the battery module.
There's a Ni-MH cell + some electronics. Having IC names would help a lot.
If the IC are small microcontrollers then I cannot do much (I don't have knowledge about this subject yet).
However if those are just some charge controllers then tricking the card should be possible ( I have plenty of parts/tools and experience in this).

Or just a new cheap RAID 6 capable controller that won't cost much.
That is 10-20USD range. Above it's cheaper to just purchase a battery.
GROM II [Gaming]
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MIR[server]
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CPUMotherboardGraphicsGraphics
i7 5820K@4.6Ghz@1.325V 2.05V input Asrock X99 Extreme 4 Sapphire R9 290X [Uber Mode] Nvidia Geforce GT240 GDDR5 512MB [PhysX + analo... 
RAMRAMRAMHard Drive
Crucial Ballistix 2400mhz 4GB 1.3V Crucial 2133@2400mhz 4GB 1.3V Crucial 2133@2400mhz 4GB 1.3V Seagate 4TB 
Hard DriveHard DriveHard DriveCooling
Samsung 840 EVO 120GB[OS] WD Red 1TB Samsung 840EVO 120GB[Arma 3] Koolance 380A [modded for LGA2011v3] 
CoolingCoolingCoolingCooling
Black Water Ultimate 123 [3x Corsair AF120 Perf... MCP655 with Alphacool HF acetal top [5th gear] Feser 10/13 UV Tubing Alphacool CKC clear 
CoolingCoolingCoolingOS
Cooltek 120mm rad [antec tri-speed] Cooltek 120mm Rad [Corsair SP120 High Performan... Alphacool GPX-A 290 [290X waterblock] Windows 7 Ulitimate 64 bit  
MonitorMonitorMonitorMonitor
LG 29EA93 [2560x1080] LG L1715S [1280x1024] Samsung SMB2030N [1600x900] DIY display on V59 controller[1366x768@1440x900] 
KeyboardPowerCaseMouse
4Tech X7 G800 Cooler Master Real Power 850w Cooler Master Haf 932 Amd Edition Microsoft Mobile Mouse 4000 
AudioAudioAudioOther
Superlux hd681 FiiO E07K SoundMax Superbeam [bundled with P5B DLX] Scythe Kaze Master Pro 6 chanell 
OtherOther
2x Sharkoon 30cm red cold cathodes 2x Revoltec 10cm UV cold cathodes 
CPUMotherboardGraphicsRAM
Athlon II X2 250 @2GHZ @1core Gigabyte 870A-USB3 Ati X600 128MB GoodRam 4gb 1333mhz 
Hard DriveHard DriveHard DriveHard Drive
Hitachi Ultrastar 1TB Samsung 40gb[OS] 6x Hitachi 2TB (RAID 6) 2x160GB RAID 1 
OSPowerOtherOther
Debian 8.2.0 x64 Pentagram Silent Force 460W Ever Eco Pro 700 CDS [UPS] Edimax EW-7318USg [Access Point] 
CPUCPUMotherboardGraphics
Xeon E5420 Xeon E5420 HP ML350 G5 motherboard HD5450 with HD5770 cooler on passive [PCIE X4] 
RAMHard DriveHard DriveHard Drive
20GB FB-DIMM@800mhz 2x40GB WD RAID0 Sata [11year old as for 2015] 2x73GB HP 15K RPM RAID0 SAS HP 10K RPM 143GB SAS 
Hard DriveHard DriveMonitorPower
HP 10K RPM 143GB SAS HP 10K RPM 143GB SAS Fujitsu W19-1 [1440x900] Delta DPS 800W 
CaseOtherOtherOther
HP ML350 G5 case Adaptec SATA II RAID 1220SA ADAPTEC SCSI-CARD 29320LP Quantum TC-L32BX LTO 3 [tape drive] 
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GROM II [Gaming]
(34 items)
 
 
MIR[server]
(16 items)
 
CPUMotherboardGraphicsGraphics
i7 5820K@4.6Ghz@1.325V 2.05V input Asrock X99 Extreme 4 Sapphire R9 290X [Uber Mode] Nvidia Geforce GT240 GDDR5 512MB [PhysX + analo... 
RAMRAMRAMHard Drive
Crucial Ballistix 2400mhz 4GB 1.3V Crucial 2133@2400mhz 4GB 1.3V Crucial 2133@2400mhz 4GB 1.3V Seagate 4TB 
Hard DriveHard DriveHard DriveCooling
Samsung 840 EVO 120GB[OS] WD Red 1TB Samsung 840EVO 120GB[Arma 3] Koolance 380A [modded for LGA2011v3] 
CoolingCoolingCoolingCooling
Black Water Ultimate 123 [3x Corsair AF120 Perf... MCP655 with Alphacool HF acetal top [5th gear] Feser 10/13 UV Tubing Alphacool CKC clear 
CoolingCoolingCoolingOS
Cooltek 120mm rad [antec tri-speed] Cooltek 120mm Rad [Corsair SP120 High Performan... Alphacool GPX-A 290 [290X waterblock] Windows 7 Ulitimate 64 bit  
MonitorMonitorMonitorMonitor
LG 29EA93 [2560x1080] LG L1715S [1280x1024] Samsung SMB2030N [1600x900] DIY display on V59 controller[1366x768@1440x900] 
KeyboardPowerCaseMouse
4Tech X7 G800 Cooler Master Real Power 850w Cooler Master Haf 932 Amd Edition Microsoft Mobile Mouse 4000 
AudioAudioAudioOther
Superlux hd681 FiiO E07K SoundMax Superbeam [bundled with P5B DLX] Scythe Kaze Master Pro 6 chanell 
OtherOther
2x Sharkoon 30cm red cold cathodes 2x Revoltec 10cm UV cold cathodes 
CPUMotherboardGraphicsRAM
Athlon II X2 250 @2GHZ @1core Gigabyte 870A-USB3 Ati X600 128MB GoodRam 4gb 1333mhz 
Hard DriveHard DriveHard DriveHard Drive
Hitachi Ultrastar 1TB Samsung 40gb[OS] 6x Hitachi 2TB (RAID 6) 2x160GB RAID 1 
OSPowerOtherOther
Debian 8.2.0 x64 Pentagram Silent Force 460W Ever Eco Pro 700 CDS [UPS] Edimax EW-7318USg [Access Point] 
CPUCPUMotherboardGraphics
Xeon E5420 Xeon E5420 HP ML350 G5 motherboard HD5450 with HD5770 cooler on passive [PCIE X4] 
RAMHard DriveHard DriveHard Drive
20GB FB-DIMM@800mhz 2x40GB WD RAID0 Sata [11year old as for 2015] 2x73GB HP 15K RPM RAID0 SAS HP 10K RPM 143GB SAS 
Hard DriveHard DriveMonitorPower
HP 10K RPM 143GB SAS HP 10K RPM 143GB SAS Fujitsu W19-1 [1440x900] Delta DPS 800W 
CaseOtherOtherOther
HP ML350 G5 case Adaptec SATA II RAID 1220SA ADAPTEC SCSI-CARD 29320LP Quantum TC-L32BX LTO 3 [tape drive] 
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