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On Sun, Apr 18, 2010 at 10:42, Jarry <mr.jarry@×××××.com> wrote: |
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> On 18. 4. 2010 8:57, Ciprian Dorin, Craciun wrote: |
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> |
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>> * there is an option for the kernel that must be enabled at |
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>> compile time that enables automatic RAID detection and assembly by the |
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>> kernel before mounting /, but it works only for MD metadata 0.96 (see |
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>> [1]); |
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>> * the default metadata for `mdadm` is 1.2 (see `man mdadm`, and |
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>> search for `--metadata`), so when creating the RAID you must |
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>> explicitly select the metadata you want; |
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> |
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>> [1] |
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>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/md.txt;h=188f4768f1d58c013d962f993ae36483195fd288;hb=HEAD |
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> |
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> |
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> Which version of mdadm are you using? I have 3.0, and defalut metadata |
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> is 0.90: |
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> |
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> -e , --metadata= |
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> Declare the style of RAID metadata (superblock) to be used. The |
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> default is 0.90 for --create, and to guess for other operations. |
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> The default can be overridden by setting the metadata value for |
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> the CREATE keyword in mdadm.conf. |
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> |
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> BTW [1] says about kernel 2.6.9, things might have changed since then... |
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> |
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> Jarry |
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On my laptop on which I've made the experiments I have ArchLinux |
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(which always has the bleeding edge packages), I have 3.1.2. So maybe |
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between 3.0 and 3.1 there was this switch from 0.90 to 1.2 default |
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metadata. |
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About the autodetection stuff I'm absolutely positive that it only |
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handles 0.90 format as I've tried it and didn't work with the 1.x |
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version of superblock format. |
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Ciprian. |
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