On 13/09/13 22:12, Marcel Meckel wrote: > Hi there, > > The newly ordered machine spec is as follows: > > 25x 600GB 2.5" SAS 10k rpm 6G DP disks > > My preferred RAID config would be RAID6 (HP calls it ADG, > Advanced Data Guard) over 24 disks + one disk as hot spare.
So if 3 out of 23 disks fail in less time that it takes to complete a rebuild, then you will lose 100% of your data. Perhaps you might consider dividing that into two, and making at least 2 x RAID6 arrays with 11 drives each, and keep 2 x hot spares, then combine them as a RAID0 (linear) so you can easily expand later as needed. PS, suggestion is based on reading advice given on the linux-raid list, where they usually seem to suggest no more than 8 to 10 drives per RAID6 array (from memory). I think it is based on reducing the chance of multiple disk failures on a single array with a large number of disks. Regards, Adam -- Adam Goryachev Website Managers Ph: +61 2 8304 0000 [email protected] Fax: +61 2 8304 0001 www.websitemanagers.com.au -- Adam Goryachev Website Managers www.websitemanagers.com.au ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
