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Volker Armin Hemmann <volker.armin.hemmann@××××××××××××.de> posted |
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200802061341.37169.volker.armin.hemmann@××××××××××××.de, excerpted below, |
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on Wed, 06 Feb 2008 13:41:37 +0100: |
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|
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> and the more spindles, the higher the chance for a fatal disk crash. |
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Well yes, but that's sort of the point of using RAID-6 instead of RAID-5, |
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and once one gets over 8-10 disks, RAID-10 or RAID-61 (? or would it be |
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called 16, duplicating each disk, not the entire RAID-6 ?) becomes |
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practical. |
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Actually, today I'd probably implement it using a couple of those |
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external 5-way port-multipliered SATA boxes, connecting each to the |
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system via single SATA-300 cable, which should handle 5 disk's disk-rate |
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I/O reasonably well without bottlenecking. Connect each cable to a |
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separate SATA-300 card on separate PCI-E or PCI-X channels, avoiding |
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bottlenecking there, and the bandwidth should be reasonable. Because the |
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external disk arrays have their own power supplies, the one in the |
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computer itself wouldn't have to be such a honker, I could run low noise |
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supplies in all of them, and the computer case could be smaller too, as |
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the only drive in it would be a DVD burner. It'd be three smaller, |
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quieter, more portable and easier to work with boxes, in place of the |
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single full tower case, quad internal hard drives plus DVD burner, I'm |
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using today. The dual 5-way drive cases would give me space for ten |
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drives, of which I'd probably make two hot-spares, leaving an 8-way |
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RAID-6, two parity, six data stripes. Large write performance, the real |
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killer now, would be much better, and because I'd have two hot-spares |
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ready for the system to bring online if necessary, total reliability |
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should remain comparable to now, 4-way RAID-6 but without the hot-spares. |
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-- |
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Duncan - List replies preferred. No HTML msgs. |
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"Every nonfree program has a lord, a master -- |
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and if you use the program, he is your master." Richard Stallman |
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