Re: [gentoo-user] Re: Raid5 not assembled after boot

[Roy Wright]

Francesco Talamona wrote:
> On Saturday 19 April 2008, Roy Wright wrote:
>> Looking thru dmesg and /var/log/messages, it looks like there are no
>> attempts to start the array until I manually try.
>>
>> Any hints on what I'm missing?
>
> Personal experience:
>
> 1) don't mix raidtools stuff with mdadm, use only the latter (I'm not
> saying you used raidtools, but I found a lot of misleading
> documentation lying around)
>
> 2) check carefully the UUID of *all* the partitions, I had exactly the
> same issue, that I discovered to be caused by a leftover partition that
> was part of a different raid set (spurious UUID). At some point in the
> bootup the correct set were disassembled.
>
> 3) evms can badly intefere with mdadm (or it was LVM?): try to modify a
> partition/raid setup and it always appears busy, preventing any
> editing.
>

Thank you.

I only used mdadm following the gentoo.org docs and gentoo-wiki howtos.

Just confirmed all three drives and the mdadm.conf UUID's are the same.

evms not installed.
lvm2 not installed.  yet.

I think I found the answer in the man page:

      --auto-detect
              Request that the kernel starts any auto-detected arrays.
              This can only work if md is compiled  into  the  kernel
              -- not if it is a module.  Arrays can be auto-detected
              by the kernel if all the components are in primary MS-DOS
              partitions with partition type FD.   In-kernel  autodetect
              is not recommended for new installations.  Using mdadm to
              detect and assemble arrays -- possibly in an initrd -- is
              substantially more flexible and should be preferred.

Basically it seems that I need to add a "mdadm --assemble --scan" to a
startup file.

Thanks again!

Have fun,
Roy



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