G+_Travis Hershberger Posted July 3, 2014 Share Posted July 3, 2014 Can we please get a RAID primer sometime? I'm seeing lots of parity RAID being recommended with HDD, and I cringe every time. Ref: http://mangolassi.it/topic/121/raid-link-blast#2441 http://mangolassi.it/topic/121/raid-link-blast#2441 Link to comment Share on other sites More sharing options...
G+_Rich Fowler Posted July 4, 2014 Share Posted July 4, 2014 Yeah, I'm thinking about setting up a FreeNAS box, but now I'm reading that RAID-6 will be useless by 2019, and that's being optimistic. I'd love to see more depth on this. Link to comment Share on other sites More sharing options...
G+_Travis Hershberger Posted July 7, 2014 Author Share Posted July 7, 2014 I've been bitten by the RAID 5 rebuild failures myself, so I have bad reactions when people start talking about using any sort of parity RAID. Thankfully when I had that happen it was a backup device that had everything transferred before starting the rebuild. Link to comment Share on other sites More sharing options...
G+_Cole Brodine Posted July 7, 2014 Share Posted July 7, 2014 Raid Parity is a nice theory, but I have a backup 4 TB external drive that syncs nightly, just in case. Can't count on parity by itself. Link to comment Share on other sites More sharing options...
G+_Taylor Graham Posted July 8, 2014 Share Posted July 8, 2014 There's nothing wrong with parity. All RAID technologies (other than mirrored arrays) use parity in some fashion. You just have to rely on a technology that can survive multiple failures (not raid5). And as always, RAID is for fault tolerance, and is not a backup. Link to comment Share on other sites More sharing options...
G+_Travis Hershberger Posted July 8, 2014 Author Share Posted July 8, 2014 You are correct that parity in and of itself is not an issue. The problem is the performance penalty RAID 6 arrays impose. If you really don't care about performance (IE backups) it can work well, but if you want to do something like record and playback video at the same time it very well might not work. Link to comment Share on other sites More sharing options...
G+_Taylor Graham Posted July 8, 2014 Share Posted July 8, 2014 I've never used RAID 6, but i know my RAID Z2 arrays are almost as fast as solid states. Faster than my network connection can support. The only downside is the amount of ram required (ram is cheap though). Yeah so software raid all day. Link to comment Share on other sites More sharing options...
G+_Travis Hershberger Posted July 9, 2014 Author Share Posted July 9, 2014 Taylor Graham Of course it does, after all it's using RAM for caching. Give me the equivalent of a RAM drive and I can get that great performance out of any storage system. Link to comment Share on other sites More sharing options...
G+_Taylor Graham Posted July 9, 2014 Share Posted July 9, 2014 "a lot of ram" doesn't have to be a ton. My systems run great with 8GB. If that's all you need to get "great performance out of any storage system", then just do it. Link to comment Share on other sites More sharing options...
G+_Travis Hershberger Posted July 9, 2014 Author Share Posted July 9, 2014 The point is that you WILL run out of that RAM space, and then you'll wonder why everything suddenly seems to just stop. Link to comment Share on other sites More sharing options...
G+_Will O'Meara Posted July 15, 2014 Share Posted July 15, 2014 I always use RAID 1+0 with four drives, works great. Link to comment Share on other sites More sharing options...
Recommended Posts