At 12:43 AM -0400 2001-06-20, Iain Campbell wrote: >In the truly curious department: > >man raidtab says, and I quote, > > parity-algorithm > The parity-algorithm to use with RAID5. It must be > one of left-asymmetric, right-asymmetric, left-sym- > metric, or right-symmetric. left-symmetric is the > one that offers maximum performance on typical > disks with rotating platters. > >So what are the other algorithms, and where would you use them if not on >"disks with rotating platters?" Google and some persistence came up with more than you might want to know: http://www.research.digital.com/SRC/personal/eklee/Papers/lee93d.pdf http://www.pdl.cs.cmu.edu/PDL-FTP/Declustering/Thesis.pdf One flaw in the simulations, it seems to me, is that they assume rotationally-synchronized spindles. Is this very common is contemporary RAID arrays? I'd have guessed not.... WRT rotating platters, presumably solid-state and especially random-access memories (eg flash). -- /Jonathan Lundell. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [EMAIL PROTECTED]
