Anybody have a good recommendation for a RAID 5 Card?
On Mon, Jun 25, 2012 at 9:24 AM, Lloyd Brown <[email protected]> wrote: > I would add that there are effective capacity differences between the > different RAID levels. For example, for N disks of K size: > > RAID5: > total capacity = (N-1)*K > > RAID6: > total capacity = (N-2)*K > > RAID10: > total capacity = N*K/2 > > > Depending on your application, it's possible that, like you say "Disk is > cheap", and that's enough to minimize the impact of capacity issue for > the OP. But I think it's wise to present all the details, and let him > decide what's important for the application, budget, etc. > > I certainly like it when vendor reps, etc., do that for me. > > Lloyd Brown > Systems Administrator > Fulton Supercomputing Lab > Brigham Young University > http://marylou.byu.edu > > On 06/23/2012 10:27 AM, Nicholas Leippe wrote: >> Raid6: >> - can withstand any combination of double disk fault >> - much worse healthy write performance than 1+0 >> - huge performance penalty in degraded and rebuild mode >> >> Raid1+0: >> - can only withstand specific combinations of double disk fault (must >> not be two pairs of the same mirror) >> - minimal healthy write performance penalty >> - performance hardly affected in degraded mode, rebuild mode is a >> simple copy--no CPU calculations, just I/O > > /* > PLUG: http://plug.org, #utah on irc.freenode.net > Unsubscribe: http://plug.org/mailman/options/plug > Don't fear the penguin. > */ /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
