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PERC 5/i RAID Card: Tips and Benchmarks - Page 308

post #3071 of 7150
Quote:
Originally Posted by BLinux View Post
Those numbers are about right for a 2 HDD setup.... though, you don't really need the PERC 5/6 controller for a 2 HDD setup.... you could get those type of numbers with 2HDD/RAID-0 in software...
so even if the hds are 15k they look right?
post #3072 of 7150
Quote:
Originally Posted by supermiguel View Post
so even if the hds are 15k they look right?
yes... what were you expecting? SAS drives have lower areal density than SATA drives, so even with the higher RPM, the sustained throughput is only marginally better. you do get better access times, which is good for random I/O patterns.

Seagate's doc claims sustained throughput between 79-112MBytes/sec, so with two drives in RAID-0, the most you can ever expect is about 158-224MBytes/sec. your numbers are well within that ballpark.
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MotherboardGraphicsRAMHard Drive
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Hard DriveCoolingOSMonitor
Western Digital 3TB RE Noctua NH-D15 Fedora 21 Linux Samsung S27D590C 
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post #3073 of 7150
Quote:
Originally Posted by BLinux View Post
yes... what were you expecting? SAS drives have lower areal density than SATA drives, so even with the higher RPM, the sustained throughput is only marginally better. you do get better access times, which is good for random I/O patterns.

Seagate's doc claims sustained throughput between 79-112MBytes/sec, so with two drives in RAID-0, the most you can ever expect is about 158-224MBytes/sec. your numbers are well within that ballpark.
So with 3 i should get around 300 and with 4 around 400???
post #3074 of 7150
Quote:
Originally Posted by supermiguel View Post
So with 3 i should get around 300 and with 4 around 400???
yes, something like that... there is a point of diminishing returns, and if you hit architectural bottlenecks, for example, the PCI-E x8 bus can only do 2GBytes/sec max, or on the PERC 5/I, the internal PCI-X bus can only do 1Gbytes/sec max. There are also other considerations that will prevent you from reaching the "theoretical max" limits, but for RAID-0 and 2-4 hard drives, I think you'll see a close to proportional increase in performance.
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TAIPEI
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MotherboardGraphicsRAMHard Drive
ASRock X99 Extreme11 EVGA GTX 980 Superclocked 32GB 8x4GB Corsair LPX Samsung XP941  
Hard DriveCoolingOSMonitor
Western Digital 3TB RE Noctua NH-D15 Fedora 21 Linux Samsung S27D590C 
PowerCase
Seasonic SS-1200XP Cooler Master Cosmos II 
CPUMotherboardGraphicsRAM
Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
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WD3000FYYZ PERC H700 w/ 512MB cache CentOS 7.2.1511 950W x2 
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post #3075 of 7150
Quote:
Originally Posted by BLinux View Post
yes, something like that... there is a point of diminishing returns, and if you hit architectural bottlenecks, for example, the PCI-E x8 bus can only do 2GBytes/sec max, or on the PERC 5/I, the internal PCI-X bus can only do 1Gbytes/sec max. There are also other considerations that will prevent you from reaching the "theoretical max" limits, but for RAID-0 and 2-4 hard drives, I think you'll see a close to proportional increase in performance.
will u say is worth it upgrading from 2 to 3 hds? considering i will install my os in this array,
Edited by supermiguel - 8/19/09 at 7:38pm
post #3076 of 7150
Quote:
Originally Posted by supermiguel View Post
will u say is worth it upgrading from 2 to 3 hds? considering i will install my os in this array,
that depends on what your objective is... are you trying to build a super fast system that will boot the OS really quickly? do you care about reliability? in RAID-0, the more hard drives you add, the more likely the chances are you'll end up losing all your data.

either way though, if you're only using 2 hdd, you might as well sell your PERC 5/I card... I would only use the PERC 5/I if you wanted to use RAID-5 or RAID-10 with 4 or more hard drives. Anything less, i don't think you're really in need of hardware RAID.
TAIPEI
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PowerCase
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CPUMotherboardGraphicsRAM
Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
Hard DriveOSPower
WD3000FYYZ PERC H700 w/ 512MB cache CentOS 7.2.1511 950W x2 
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TAIPEI
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AURORA
(13 items)
 
 
MotherboardGraphicsRAMHard Drive
ASRock X99 Extreme11 EVGA GTX 980 Superclocked 32GB 8x4GB Corsair LPX Samsung XP941  
Hard DriveCoolingOSMonitor
Western Digital 3TB RE Noctua NH-D15 Fedora 21 Linux Samsung S27D590C 
PowerCase
Seasonic SS-1200XP Cooler Master Cosmos II 
CPUMotherboardGraphicsRAM
Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
Hard DriveOSPower
WD3000FYYZ PERC H700 w/ 512MB cache CentOS 7.2.1511 950W x2 
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post #3077 of 7150
Quote:
Originally Posted by BLinux View Post
that depends on what your objective is... are you trying to build a super fast system that will boot the OS really quickly? do you care about reliability? in RAID-0, the more hard drives you add, the more likely the chances are you'll end up losing all your data.

either way though, if you're only using 2 hdd, you might as well sell your PERC 5/I card... I would only use the PERC 5/I if you wanted to use RAID-5 or RAID-10 with 4 or more hard drives. Anything less, i don't think you're really in need of hardware RAID.
well im using the perc 5/i with 5 HD's, im using 2 of the 15k hd in raid 0 (OS install) and i have 3 500g that i have in raid 5 (data array). plus i dont have a sas controller in my mobo
Edited by supermiguel - 8/20/09 at 4:33am
post #3078 of 7150
Hi,

im in need of some helps i have a P6T7 motherboard with onboard sas controller.

I also have a perc 5i controller.

I cant use both together... i have 6hdd's connected to the perc 5i using 4x raid 5 2x raid 0

and then the motherboard is runnning raid 0 sas over 2 drives

If i unplug the perc 5i, i can use my onboard sas controller, if i dont i cant boot into windows

HELLPPPSSSS

Anyone have any ideas?

I'm using the latest dell firmware for the card, wondered if changing to the lsi firmware would make any diffference?

Many thanks


ok after a fiddle, i turned off the bios option using ctrl+h?

does this have any detrimental effect to the raid? or is this there to allow multiple cards to boot?

Also is it still worth using lsi raid thing?
Edited by Diakatarnis - 8/20/09 at 6:08am
post #3079 of 7150
Turning off the BIOS just means you can't boot from it. It doesn't affect anything else.

The LSI firmware offers larger stripe sizes & slightly more performance, but whether that is worth the hassle is up to you.
post #3080 of 7150
Works on MSI P45D3 Platinum with PinMod
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