-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Tom Brown wrote: > -----Original Message----- From: Adam Goryachev > [mailto:mailingli...@websitemanagers.com.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 a...@websitemanagers.com.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@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
