Re: Backups work! (when you've got 'em)

Leif Sawyer wrote:
> Damien Hull wrote:
>
>> I write this because I know most people don't backup their
>> data. Here's proof that they not only work but can save you
>> time and effort.
>>
> I'd extend this out to remind folks that LVM and RAID don't count
> as backups.
>
> I just learned the hard way that when an LVM gets corrupted, things go
> downhill really fast.
>
> Short story:
> RAID-1 mirror of disk partition
> LVM container inside RAID-1
> root and user partitions inside LVM container
>
> LVM goes crackers
> root partition fully corrupted
> usr partition status unknown
>
> Which actually brings me to the fun part:
>
> I _just_ hax0red a -really- dirty little application to scan the disk/image
> for an EXT2/EXT3 header, and after some sanity checks, print the results.
> Pretty useful for forensics, but in serious need of performance
> enhancements.
>
> Anybody interested in this? Or want to play with trying to boost the
> performance?
> ~500MB/hour is pretty slow, especially in relation to a 78GB drive... ugh.
>
> oh, and as a followup to the story... no, it's not done searching the drive
> for my /usr partition.
> If I could remember how big the 'root' was, I could estimate where to start
> the searching...
> it was somewhere between 9G and 20G, so... yeah...
>
>
> Towards the future? Add a third drive to the mirror, for rsync backups.
> That way human error
> is also reversable. :-)
>
>
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>
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>
My server is using software RAID 1 and LVM. It works well. RAID is nice
but it doesn't save you if you delete data. Once you do that it's gone.

Is it better to have RAID 1 or 5 ( no 0 ), backup of your data to DVD
etc..., or both? I would like to get peoples thoughts on this.

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Received on Wed Jan 31 11:44:51 2007