On 10/17/13 20:07, Scott McEachern wrote: ... > I realize the bioctl(8) man page says "Use of the CRYPTO & RAID 4/5 > disciplines are currently considered experimental." ... > I've never tried softraid's RAID5, so I have no idea if it truly is > "experimental", or solid like CRYPTO, or somewhere in between. > > So I ask my fellow list'ers for their experiences with OpenBSD's RAID5 > implementation. (Yes, I'm running -current.) Does it "work" for you?
with the exception of the fact there's no code to rebuild a failed disk, works great. that's a pretty big exception for most people. :) > Have you had any good experiences? Any bad experiences? Have you had to > actually rebuild a RAID5 array? you should be trying this stuff yourself. Doesn't matter if *I* can rebuild your array, it matters if YOU can. You don't have to practice on 3TB disks, you can practice on 10GB disks...though understanding the time required for 3TB disks would be wise. > Can you add another drive to the array > at a later time, or does the array need to be destroyed and rebuilt from > scratch? we'll have to get rebuild working before we get restructure. :) > Also, in theory, with RAID5 you only "lose" one drive for the parity, > hence my "18TB non-RAID => 15TB RAID5" math. Is this correct in > practise with softraid? other than a 3TB disk is closer to 2.75TB than 3TB, yeah the math works the same with softraid as it does with hw raid. Nick.
