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Am 17.09.2013 20:11, schrieb covici@××××××××××.com: |
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> Volker Armin Hemmann <volkerarmin@××××××××××.com> wrote: |
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> |
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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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> How do you turnoff read ahead? |
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> |
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set it with blockdev to 8 (for example). Doesn't turn it off. Just makes |
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it none-obstrusive. |
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