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Volker Armin Hemmann <volkerarmin@××××××××××.com> wrote: |
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> Am 17.09.2013 09:20, schrieb Grant: |
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> > I'm convinced I need 3-disk RAID1 so I can lose 2 drives and keep |
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> > running. I'd also like to stripe for performance, resulting in |
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> > RAID10. It sounds like most hardware controllers do not support |
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> > 6-disk RAID10 so ZFS looks very interesting. |
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> > |
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> > Can I operate ZFS RAID without a hardware RAID controller? |
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> > |
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> > >From a RAID perspective only, is ZFS a better choice than conventional |
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> > software RAID? |
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> > |
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> > ZFS seems to have many excellent features and I'd like to ease into |
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> > them slowly (like an old man into a nice warm bath). Does ZFS allow |
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> > you to set up additional features later (e.g. snapshots, encryption, |
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> > deduplication, compression) or is some forethought required when first |
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> > making the filesystem? |
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> > |
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> > It looks like there are comprehensive ZFS Gentoo docs |
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> > (http://wiki.gentoo.org/wiki/ZFS) but can anyone tell me from the real |
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> > world about how much extra difficulty/complexity is added to |
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> > installation and ongoing administration when choosing ZFS over ext4? |
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> > |
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> > Performance doesn't seem to be one of ZFS's strong points. Is it |
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> > considered suitable for a high-performance server? |
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> > |
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> > http://www.phoronix.com/scan.php?page=news_item&px=MTM1NTA |
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> > |
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> > Besides performance, are there any drawbacks to ZFS compared to ext4? |
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> > |
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> do yourself three favours: |
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> |
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> use ECC ram. Lots of it. 16GB DDR3 1600 ECC ram cost you less than 170€. |
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> And it is worth it. ZFS showed me just how many silent corruptions can |
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> happen on a 'stable' system. Errors never seen neither detected thanks |
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> to using 'standard' ram. |
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> |
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> turn off readahead. ZFS' own readahead and the kernel's clash - badly. |
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> Turn off kernel's readahead for a visible performance boon. |
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> |
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> use noop as io-scheduler. |
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|
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How do you turnoff read ahead? |
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|
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-- |
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Your life is like a penny. You're going to lose it. The question is: |
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How do |
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you spend it? |
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|
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John Covici |
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covici@××××××××××.com |
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