Tracy R Reed wrote: > > [NetAPP says] use only RAID1 or RAID6. This is in line with CMU's > suggestion that the odds of a double failure in a RAID5 is greater than > we think.
Odd. NetAPP uses RAID 4. http://72.14.253.104/search?q=cache:Hn3aFdnbmSAJ:www.netapp.com/library/tr/3295.pdf The standard RAID group type on NetApp appliances has been RAID4, and this RAID group type continues as an option going forward. They have this new RAID-DP thing, which is not quite RAID-6: Whereas in RAID4, the parity disk stores row parity across the disks in a RAID4 group, the additional RAID-DP parity disk stores diagonal parity across the disks in a RAID-DP group. With these two parity stripes in RAID-DP, one horizontal and the other diagonal, data protection is obtained even in the event of two disk drives failing in the same RAID group. -john -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
