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On 28 October 2006 23:39, Alan McKinnon wrote: |
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> On Saturday 28 October 2006 16:41, b.n. wrote: |
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> > Dale ha scritto: |
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> > > If you use XFS, make sure you have good power. XFS does not like |
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> > > power failures at all. I have had to reinstall on a second rig |
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> > > because of this very problem. If you have a UPS, that may be OK. |
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> > |
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> > Thanks a lot for the advice. Power outages do happen and I don't have |
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> > an UPS. Why does it happen? Isn't XFS journaled? |
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> |
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> Yes it is journaled but it also allows data to be very aggressively |
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> cached. Make that VERY aggressively cached. With the result that data |
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> can be held in a huge cache somewhere and the kernel can be convinced |
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> it has been written to disk. |
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|
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No journaled filesystem can 100% prevent data loss or even filesystem |
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corruption in cases of power outages. Think of the the builtin caches of your |
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drive. If that builtin cache contains a changed journal (not written to the |
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actual drive yet) when a power failure occurs => bang! |
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|
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Uwe |
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|
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-- |
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Mark Twain: I rather decline two drinks than a German adjective. |
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http://www.SysEx.com.na |
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-- |
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