Re: What hardware for RAID5? (PCIe controller or fast onboard)
From: Eyal Lebedinsky <hidden>
Date: 2009-03-18 21:10:58
A word of caution. 6 on-board SATA is not always enough. It is often the case that using all will hit internal bandwidth limits. I find it common for 4 disks to be handled OK but 5 are too much. A simple test of 5 concurrent dd's will tell you if all disks are going full speed. Some time one combination of 5 out of 6 (or 8) on-board sockets will perform better than other and it is worth checking. Eyal Goswin von Brederlow wrote:
Dexter Filmore [off-list ref] writes:quoted
I want to upgrade server hardware here, currently I have 5 Samsungs (sATA II) sitting on the onboard controller of an Asus K8N-E Socket754 board. I guess the controller chips are both connected via PCI hence performance isn't really hot. Basically I need either a board with at least 6x sATA-II attached via PCIe or a "dumb" PCIe 4x or 8x controller card. Any recommendations? DexAnything that is not pci. PCIe or PCI-X will both be way faster. Server boards with 6x SATA-II onboard are hard to miss. And any cheap PCIe/PCI-X controler will probably do. One important thing to think about is hotplug support. Do you need it or not? Look for a board and then check out http://linux-ata.org/ for support. MfG Goswin
-- Eyal Lebedinsky (eyal@eyal.emu.id.au)