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LSI 9240 vs Highpoing 2720 vs LSI 9260

post #1 of 3
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I want to get a new raid5 card and my bidget is limited. I currently have a Dell perc5i with 512mb cache and BBU, which is perfectly fine performance-wise, but a pain in the ass to expand and with a limit up to 2tb/drive, so it needs to be replaced!

Due to limited funding, I am forced to look into the LSI 9240-8i and the Highpoint 2720, which both are fake-raid cards and inferior to the Dell I got performance-wise.

Both are Sata3 (6gbps), 8 slots and should support >2tb drives and Capacity expansion, and both cost around 250$.

Before I went for the Perc5i I used the onboard raid on Intel ICH10R, but the write speed was snail-slow, I had 20mb/s in reallife scenarios. With the perc this went up to 100mb/s which is nice.

My question here is, those fake-raid cards, how many mb/s write speeds can I expect from them? I really hope they use enough of my CPU for XOR calculations, I don't mind, I got a sandy bridge 2600k at 4.7GHz idle most of the time...
But do they use it? Can they manage a respectable 70mb/s+ sequential speed? I don't want to drop to ICH10R levels again...

If they are bad then the only solution is LSI 9260 which is a true hardware raid card....but it's too damn expensive for my budget

So, tell me please, how much write speeds can I expect from them with 8 mechanical disks in raid5? (assuming an average 100mb/s read/write in each of those disks)
And which of the 2 would you recommend, the LSI or the highpoint?
post #2 of 3
Really depends on what *kind* of raid sets you will create.

Raid 0/1/10 : No parity is calculated so any fake-raid solution will give you decent results w/o taxing your CPU.

Raid 5/50/6/60 : Parity calculations on CPU will take up rescources and will also be slower then any of the new 800Mhz RoC based cards.
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SR2 OverKill
(13 items)
 
  
CPUMotherboardGraphicsRAM
2 x Intel X5680's @ 4.44GHz EVGA SR-2 4 x eVGA Hydrocopper GTX580 QUAD-SLI 24GB G.Skill Trident+ 2000Mhz C8 
Hard DriveOptical DriveOSMonitor
10xVertex 3 120GB SSD's & 2xC300 128GB :Raid 0 Plextor DVD/RW Windows 7 Ultimate 64 3 x 28" @ 5760x1200 
KeyboardPowerCaseMouse
Logitech G19 / G15 2 x Silverstone Strider 1500W CaseLabs TH10 Extended MX Revolution 
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post #3 of 3
im using the 2720 with 4 sata 6gb drives in raid 5, but the max real world speed ive gotten is only 40MB/s. Atto says i should be getting over 300MB/s.
I've been trying to figure out why there is such a discrepancy between the numbers.
can anyone help me out?

ive tried transferring over a file share, and between arrays but always 40MB/s
Edited by sunnyd787 - 10/6/11 at 11:39am
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