Mailinglist Archive: opensuse (1118 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

Lew Wolfgang wrote:

> Questions:
>
> I'm assuming that I can physically remove one of the RAID-6 arrays
> and install the disks in another (identical) chassis.  An empty and
> uninitialized array will also be in the second chassis.  Do I need
> to do anything with mdadm to cause the mirror on the second
> chassis to rebuild the empty array with the data from the first
> chassis? Would it be a matter of just plugging in the disks, turn 
> on the power and step back?  Or will some mdadm ju-ju be required?
> Will the wrong array be replicated?

Definitely _some_ mdadm ju-ju required - it sounds like this: 

assemble a new RAID6 of set#1 (existing data)
create RAID1 = set#1 + faulty. 
create RAID6 of set#2 (uninitialized array)
hot-add this to your RAID1.

> In case you're wondering, the next iteration will require 2-TB data
> disks.   We also have a complete clone of the whole system to be
> used as a spare if necessary.  This data HAS to be recorded!  I
> realize this configuration is probably overkill, but it's better to
> be safe than sorry.
>
> Is there anything else I'm forgetting to consider?

Battery-backed write caches or site-wide UPS?
Staging disk purchases by production dates?

Your initial RAID61 config will survive up to five concurrent disk
failures (worst case) - is there a better config? 



-- 
Per Jessen, Zürich (15.2°C)

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