-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Tom Brown wrote:
> -----Original Message----- From: Adam Goryachev
> [mailto:mailinglists AT websitemanagers.com DOT au] 2) Use 2 hard drives
> of equal size in a RAID1 mirror (or 3 or more in a RAID5 or RAID6)
> to ensure that your backups will survive a disk failure.
>
> RAID1 or RAID5 will certainly reduce the likelihood of data loss,
> but I'm not sure that either RAID configuration ensures data
> protection. I've read arguments that, as the size of drives
> increase, the likelihood of RAID5 protecting data decreases. An
> offsite backup of your data is your best insurance.
>
> This can be a contentious issue, and I am no expert. Here are
> links.
>
> http://blogs.zdnet.com/storage/?p=162&tag=nl.e539
> http://miracleas.com/BAARF/RAID5_versus_RAID10.txt
>
> As Adam said, just my opinion. And probably less informed than his.
>
While we all agree that RAID5 is better than none, how much redundancy
is ever enough? Even an off-site backup has to be stored on some
media... is that RAID5/6/10/etc ...

Do we need to use RAID61 (Would that be a group of RAID1 arrays in a
RAID6) or is that still not enough? Can we afford to put that many
drives into a single system (ATAoE/iSCSI?)?

So, what do people out there do for their live data, as well as their
backuppc data? What happens if you lose all the data on your backuppc
system, is that considered a catastrophic loss?

Curious to see some discussion... hopefully we can avoid the flame
wars....

PS, from the article, it seems to me that even RAID1 is eventually
going to have the same issue, because when you try to rebuild, you
only ever have one source of data (unless you use 3 disk RAID1)....

Regards,
Adam

- --
Adam Goryachev
Website Managers
Ph: +61 2 8304 0000                            adam AT websitemanagers.com DOT 
au
Fax: +61 2 8304 0001                            www.websitemanagers.com.au
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkokXj8ACgkQGyoxogrTyiXcXACfeXFSy85HJqEo/6SpDErK05sK
7HAAn21kd7B6a63cCEFdB4mEFRplzgEI
=pL5o
-----END PGP SIGNATURE-----


------------------------------------------------------------------------------
OpenSolaris 2009.06 is a cutting edge operating system for enterprises 
looking to deploy the next generation of Solaris that includes the latest 
innovations from Sun and the OpenSource community. Download a copy and 
enjoy capabilities such as Networking, Storage and Virtualization. 
Go to: http://p.sf.net/sfu/opensolaris-get
_______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List:    https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki:    http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/