On Thu, Feb 4, 2010 at 7:54 PM, Brian <broco...@vt.edu> wrote: > It sounds like the consensus is more cores over clock speed. Surprising to > me since the difference in clocks speed was over 1Ghz. So, I will go with a > quad core. >
Four cores @ 1.8Ghz = 7.2Ghz of threaded performance ([Open]Solaris is relatively decent in terms of threading). Two cores @ 3.1Ghz = 6.2Ghz :) Although you may find single threaded operations slower, as someone pointed out, but even those might wash out as sometimes its I/O that's the problem. I was leaning towards 4GB of ram - which hopefully should be enough for > dedup as I am only planning on dedupping my smaller file systems (backups > and VMs) > 4GB is a good start. > Was my raidz2 performance comment above correct? That the write speed is > that of the slowest disk? That is what I believe I have read. > You are sort-of-correct that its the write speed of the slowest disk. Mirrored drives will be faster, especially for random I/O. But you sacrifice storage for that performance boost. That said, I have a similar setup as far as number of spindles and can push 200MB/sec+ through it and saturate GigE for iSCSI so maybe I'm being harsh on raidz2 :) > Now on to the hard part of picking a motherboard that is supported and has > enough SATA ports! > I used an ASUS board (M4A785-M) which has six (6) SATA2 ports onboard and pretty decent Hypertransport throughput. Hope that helps. -marc
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