Re: Requesting replace mode for changing a disk

SandeepKsinha
2009-05-13T04:37:00Z

Hi,

On Wed, May 13, 2009 at 10:01 AM, Neil Brown <neilb@suse.de> wrote:
> On Tuesday May 12, lrhorer@satx.rr.com wrote:
>>
>> But doesn't creating the array with the drive wipe the contents?  If so, it
>> doesn't seem to me this provides much redundancy.
>
> No.  Creating an array does not wipe the contents.
> It might cause a resync which will copy contents from one drive to the
> other and I don't promise which one.
> However if you:
>
Now, my question is that what if I create a RAID1 with 100 disks on each side.
Do you mean to say that there will be unnecessary resync happening
there as well, that too for unallocated/written data.

If thats the case, we surely need to handle these two situations
differently (1) which neil mentioned (2) the one I mentioned above.

Remember I referring to the case of creation.

>   mdadm -C /dev/md0 --level 1 -n 2 /dev/foo missing
>   mdadm /dev/md0 --add /dev/bar
>
> then the contents on /dev/foo will not be changed (except for a few K
> at the end for the metadata) and then all of foo will be copied to
> bar.
>

Will the create happen at the first place?
> NeilBrown
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--
Regards,
Sandeep.

“To learn is to change. Education is a process that changes the learner.”
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