garycase Posted February 27, 2015 Share Posted February 27, 2015 Also isn't RAID 6 "dual parity" by definition? Yes. But remember that "dual parity" is a misnomer -- it's used here to simply mean 2-drive fault tolerance; but implementing this does NOT mean there are simply two parity drives. The mathematics is far more complex than a simple XOR'd parity drive for the 2nd layer of fault tolerance. RAID-6 uses a Reed-Solomon code for the 2nd level of protection, but there are other techniques that can work as well. Quote Link to comment
SSD Posted February 28, 2015 Share Posted February 28, 2015 I remember Tom mentioning that the technique he wanted to use was copyrighted or something and there was a fee. Quote Link to comment
Helmonder Posted February 28, 2015 Share Posted February 28, 2015 See the following thread for someone moving away from freenas to unraid for the exact same reasons that I think are reasons for me to never go to freenas or a similar product: http://lime-technology.com/forum/index.php?topic=38161.msg357232#msg357232 Quote Link to comment
garycase Posted February 28, 2015 Share Posted February 28, 2015 I seem to recall that discussion as well. There are at least 3 different "schemes" I'm aware of, but I'm sure there are others. I believe Tom plans to use one of the various "diagonal parity" schemes ... there are several ways to do this, and some of these are patented, so there are indeed likely to be licensing charges. I'm sure the majority of UnRAID users would willingly pay a modest charge for this implementation which would more than cover the licensing charge Quote Link to comment
Helmonder Posted February 28, 2015 Share Posted February 28, 2015 I seem to recall that discussion as well. There are at least 3 different "schemes" I'm aware of, but I'm sure there are others. I believe Tom plans to use one of the various "diagonal parity" schemes ... there are several ways to do this, and some of these are patented, so there are indeed likely to be licensing charges. I'm sure the majority of UnRAID users would willingly pay a modest charge for this implementation which would more than cover the licensing charge Yes I would. Quote Link to comment
wirenut Posted March 3, 2015 Share Posted March 3, 2015 I seem to recall that discussion as well. There are at least 3 different "schemes" I'm aware of, but I'm sure there are others. I believe Tom plans to use one of the various "diagonal parity" schemes ... there are several ways to do this, and some of these are patented, so there are indeed likely to be licensing charges. I'm sure the majority of UnRAID users would willingly pay a modest charge for this implementation which would more than cover the licensing charge Yes I would. +1 Quote Link to comment
JimPhreak Posted September 20, 2015 Share Posted September 20, 2015 I'm sure the majority of UnRAID users would willingly pay a modest charge for this implementation which would more than cover the licensing charge Where do I sign? Quote Link to comment
itimpi Posted September 20, 2015 Share Posted September 20, 2015 I'm sure the majority of UnRAID users would willingly pay a modest charge for this implementation which would more than cover the licensing charge Where do I sign? Wait for unRAID 6.2 as we have been told that this includes support for dual parity. What the licensing implications (if any) will be for the use of this feature I have no idea. Quote Link to comment
JimPhreak Posted September 20, 2015 Share Posted September 20, 2015 I'm sure the majority of UnRAID users would willingly pay a modest charge for this implementation which would more than cover the licensing charge Where do I sign? Wait for unRAID 6.2 as we have been told that this includes support for dual parity. What the licensing implications (if any) will be for the use of this feature I have no idea. That is excellent news, when was this announced? Quote Link to comment
garycase Posted September 20, 2015 Share Posted September 20, 2015 I don't think it's been formally "announced" -- but in several discussions r.e. the dual parity feature it's been made clear that v6.2 is a TARGET for that feature. Hopefully it will in fact be included at that point, but in any event it's definitely on the "list of coming attractions" Quote Link to comment
JimPhreak Posted September 20, 2015 Share Posted September 20, 2015 I don't think it's been formally "announced" -- but in several discussions r.e. the dual parity feature it's been made clear that v6.2 is a TARGET for that feature. Hopefully it will in fact be included at that point, but in any event it's definitely on the "list of coming attractions" Good to know. I don't play on using dual parity until I add more disks to my array (Currently using just 4x 8TB drives so having half the disks be used for parity isn't desirable) but I will be adding more disks in the future and at that point it's something I'll definitely want to consider. Quote Link to comment
pfp Posted December 31, 2015 Share Posted December 31, 2015 count me as another user who definitely wants to see dual parity added Quote Link to comment
Brucey7 Posted January 1, 2016 Share Posted January 1, 2016 Some of us have already moved our drives up a slot and have a second parity disk partially inserted in the server ready to build parity2 Quote Link to comment
JimPhreak Posted January 4, 2016 Share Posted January 4, 2016 When the idea for dual parity was first brought I was super interested in it. However, now that I have 8TB drives and I have a second server (that mirrors the first for backups) I personally don't think I'll ever move to dual parity. For those that don't have proper back-ups I completely understand the need/desire for it though. And since (from what I've personally witnessed) most people who run home servers don't seem to have proper backups I imagine this will be a widely popular feature. Quote Link to comment
garycase Posted January 4, 2016 Share Posted January 4, 2016 Agree with Jim => the need for dual parity is far less critical if you have complete backups (as I do). I'll likely add a 2nd parity drive anyway "just because" -- but it's FAR more important for those who don't have backups to do this. Quote Link to comment
bubbaQ Posted January 4, 2016 Share Posted January 4, 2016 I have proper backups.... but I don't want 1) the downtime until I get things restored; 2) the wasted time doing the restore; or 3) the risk that something is unrestorable due to some issue. Quote Link to comment
garycase Posted January 4, 2016 Share Posted January 4, 2016 I have proper backups.... but I don't want 1) the downtime until I get things restored; 2) the wasted time doing the restore; or 3) the risk that something is unrestorable due to some issue. Yep ... those are my reasons for adding one "just because" Quote Link to comment
Darksurf Posted February 25, 2016 Share Posted February 25, 2016 I'm also extremely interested in dual parity. After one of my friends had dual HDD failures due to having all seagates, I'm a little leery of my seagate drives. I've got 2 seagate and 2 toshiba(rebranded Hitachi). In my experience the Hitachi drives are the reliable way to go. Quote Link to comment
itimpi Posted February 25, 2016 Share Posted February 25, 2016 I'm also extremely interested in dual parity. After one of my friends had dual HDD failures due to having all seagates, I'm a little leery of my seagate drives. I've got 2 seagate and 2 toshiba(rebranded Hitachi). In my experience the Hitachi drives are the reliable way to go. We know that dual parity is going to be a feature of the 6.2 release. Quote Link to comment
trurl Posted February 25, 2016 Share Posted February 25, 2016 I'm also extremely interested in dual parity. After one of my friends had dual HDD failures due to having all seagates, I'm a little leery of my seagate drives. I've got 2 seagate and 2 toshiba(rebranded Hitachi). In my experience the Hitachi drives are the reliable way to go. We know that dual parity is going to be a feature of the 6.2 release. Also, even before we get dual parity, unRAID v6.1 provides notifications of impending disk problems so it makes it much less likely that you will have these failures before you can address the problems. If you are still on v5 (this is the v5 support area) consider upgrading. Quote Link to comment
lgo51 Posted March 17, 2016 Share Posted March 17, 2016 Howdy all, Not, yet, an unRAID user... am actively shopping the alternatives. Here is my core concern, one that if true would be total deal breaker for housing my growing music & video archive. The folks over at SnapRAID claim: "unRAID doesn't have any kind of checksum, and it just ignores silent errors. Even worse, if a parity error is detected as result of a silent error in the data, the parity is automatically recomputed, making impossible to recover the silent error, even manually." I can find no information to refute, or support, that claim.... so here I be seeking a definitive answer; Is this claim true in v6.x ? Cheers Quote Link to comment
Helmonder Posted March 17, 2016 Share Posted March 17, 2016 Its not notive in 6.2 but there are plugins that do exactly this. Quote Link to comment
lgo51 Posted March 17, 2016 Share Posted March 17, 2016 Its not notive in 6.2 but there are plugins that do exactly this. Would you kindly be more specific... TNX! Quote Link to comment
Helmonder Posted March 17, 2016 Share Posted March 17, 2016 There is a plugin that does what you ask for, I do not know it's name of the top of my head.. Quote Link to comment
Helmonder Posted March 17, 2016 Share Posted March 17, 2016 Dynamic file integrity Quote Link to comment
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