On 4/28/11 2:37 AM, martin f krafft wrote:
> also sprach Les Mikesell<lesmikesell AT gmail DOT com>  [2011.04.27.1507 
> +0200]:
>>> I think a safer alternative would be to do what the OP proposes
>>> -- that way you always have one safe copy not part of the RAID
>>> in case something messes up....
>>
>> You need that anyway, although starting from scratch it doesn't
>> matter since you have nothing to lose.  When you were trying to
>> convert an old 2-member set to 3, you should have failed/removed
>> one of the existing drives (at least logically) until you had
>> added the first external and then rotated it offsite, after which
>> you would always have the working spare.  There always is a danger
>> that the current sync will hit an error on the source leaving the
>> whole set unusable, although this should be greatly reduced when
>> the source is a 2 member mirror.
>
> There's also drdb, which provides RAID1-over-the-network. It seems
> like an excellent way to maintain an offsite copy of the backup
> topdir.

It seems like a good idea, but I don't think anyone has reported what kind of 
bandwidth it needs or what happens if the server crashes mid-write.  It doesn't 
quite give you the safety net of a completely isolated copy that you get with a 
rotating set of disks.

-- 
   Les Mikesell
     lesmikesell AT gmail DOT com



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