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On 27/11/17 22:30, Bill Kenworthy wrote: |
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> Hi all, |
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> I need to expand two bcache fronted 4xdisk btrfs raid 10's - this |
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> requires purchasing 4 drives (and one system does not have room for two |
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> more drives) so I am trying to see if using raid 5 is an option |
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> |
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> I have been trying to find if btrfs raid 5/6 is stable enough to use but |
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> while there is mention of improvements in kernel 4.12, and fixes for the |
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> write hole problem I cant see any reports that its "working fine now" |
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> though there is a phoronix article saying Oracle is using it since the |
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> fixes. |
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> |
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> Is anyone here successfully using btrfs raid 5/6? What is the status of |
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> scrub and self healing? The btrfs wiki is woefully out of date :( |
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> |
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Or put btrfs over md-raid? |
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|
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Thing is, with raid-6 over four drives, you have a 100% certainty of |
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surviving a two-disk failure. With raid-10 you have a 33% chance of |
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losing your array. |
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|
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Cheers, |
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Wol |
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