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SubjectRe: "Enhanced" MD code avaible for review
Justin T. Gibbs wrote:
>>>None of the solutions being talked about perform "failing over" in
>>>userland. The RAID transforms which perform this operation are kernel
>>>resident in DM, MD, and EMD. Perhaps you are talking about spare
>>>activation and rebuild?
>>
>>This is precisely why I sent the second email, and made the qualification
>>I did :)
>>
>>For a "do it in userland" solution, an initrd or initramfs piece examines
>>the system configuration, and assembles physical disks into RAID arrays
>>based on the information it finds. I was mainly implying that an initrd
>>solution would have to provide some primitive failover initially, before
>>the kernel is bootstrapped... much like a bootloader that supports booting
>>off a RAID1 array would need to do.
>
>
> "Failover" (i.e. redirecting a read to a viable member) will not occur
> via userland at all. The initrd solution just has to present all available
> members to the kernel interface performing the RAID transform. There
> is no need for "special failover handling" during bootstrap in either
> case.

hmmm, yeah, agreed.

Jeff




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