[Techtalk] hot-swap RAID

[Joana Botto]

I would say that 7 out of 10 times it works for me.
I'm not sure if it will accept an existing raid with a missing disk but I'll
give it a try.
Thanks Rudy.

Joana

On Wed, Oct 27, 2010 at 1:04 PM, Rudy Zijlstra <
rudy at grumpydevil.homelinux.org> wrote:

> Joana Botto wrote:
>
>> Hi all,
>>
>> I want to copy an image from a Sun Fire X2100 to another one and I'll be
>> using hot-swap RAID to do that.
>>
>> <snip>
>>
>>
>> Could this be because I'm not doing it in the right order? Is there a
>> different procedure for this?
>> Could this be because the purpose of hot-swap RAID disks is to replace a
>> faulty disk without turning off the system and not copying servers?
>>
>>
>>
> The target of hot-swap RAID is to replace a faulty disk without data-loss,
> without service loss and without turning off the system.
>
> If the implementation is such that you can do that copy, that is just
> luck...
>
> What you could do, is put the disk you removed in a separate slot in a 3th
> system, and do a block copy (dd comes to mind) to a second disk, which
> actually are a RAID pair. Then move the RAID pair to the new server. The
> controller should recognize them as an existing RAID pair and work with
> them.
>
> Most RAID controllers will wipe a disk set when you tell them you have a
> new raid set. In general, your method may work, if you can do something
> like:
> - insert only the single disk in the new server
> - tell the raid controller you have an existing raid, with a missing disk
> - let it boot
> - insert the empty blank disk that belongs to the raid pair. This will then
> be synchronised
>
> good luck
>
> Rudy
>