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Need help choosing a RAID card

post #1 of 5
Thread Starter 
I saw the massive thread about the DELL Perc cards and found a Perc 6/i for 139 here and one for 100 here

I've used ServeRaid Cards in the past and I found an ServeRaid 8s for 100 bucks here

Does anyone have any suggestions as to which one I should use for a RAID 5 with 2TB drives? Anyone else have any experience with the 8s?

Thanks for the help
post #2 of 5
alot of people favour the dell perc 5/6 cards.

i myself atm bididng on a 5/i for my nas im building.

i say go for that one.
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post #3 of 5
Thread Starter 
Is there any real difference between the Perc 6i and the Perc 5i? Other than the 6i supporting RAID 6?
post #4 of 5
The PERC 6/i uses an LSI SAS1078 RAID On Chip, as opposed to the Intel IOP333 on the PERC 5/i. The PERC 6/i is apparently capable of over 1400MB/sec, which puts it on par with high-end cards costing $600 and more.

Additionally, the PERC 6/i allows a choice of stripe sizes, while apparently the PERC 5/i stripe size is fixed at 64KB.

I think those are the other main differences. 5/i and 6/i sell for around the same sort of price on eBay, so a 6/i is worth holding out for, although for a NAS it won't make much difference, to be honest. For a workstation, I'd hold out for a 6/i.
Edited by parityboy - 2/21/11 at 2:08pm
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post #5 of 5
The PERC 5 is also a native PCI-X device, with a PCI-X to PCIe bridge onboard so it fits in a PCIe slot. As the PCI-X bus bandwidth is 1066MB/s but it's half duplex, this means that the PERC 5 is limited to ~500MB/s during certain operations (cache flushes while writing to the array). You can minimise the impact of this (upgrade the cache to 512MB and increase the buffer flush period), but the PERC 5's performance will always be hit more than the PERC 6's as a result. (although note that it's only really an issue if you have another high speed array or if you're performing high bandwidth transfers to and from a single array constantly).

I believe the PERC 6 also uses slightly lower power too (as there is only a single ROC onboard, rather than the dual chips on the PERC 5. I don't have the numbers to hand to show this though - I may be wrong
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