From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:36466 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751688AbcFIT6M (ORCPT ); Thu, 9 Jun 2016 15:58:12 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1bB65c-0006AF-Q0 for linux-btrfs@vger.kernel.org; Thu, 09 Jun 2016 21:58:04 +0200 Received: from ip-64-134-228-1.public.wayport.net ([64.134.228.1]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 09 Jun 2016 21:58:04 +0200 Received: from 1i5t5.duncan by ip-64-134-228-1.public.wayport.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 09 Jun 2016 21:58:04 +0200 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: Recommended why to use btrfs for production? Date: Thu, 9 Jun 2016 19:57:58 +0000 (UTC) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Chris Murphy posted on Thu, 09 Jun 2016 11:39:23 -0600 as excerpted: > Yeah but somewhere there's a chunk that's likely affected by two losses, > with a probability much higher than for conventional raid10 where such a > loss is very binary: if the loss is a mirrored pair, the whole array and > filesystem implodes; if the loss does not affect an entire mirrored > pair, the whole array survives. > > The thing with Btrfs raid 10 is you can't really tell in advance to what > degree you have loss. It's not a binary condition, it has a gray area > where a lot of data can still be retrieved, but the instant you hit > missing data it's a loss, and if you hit missing metadata then the fs > will either go read only or crash, it just can't continue. So that > "walking on egg shells" behavior in a 2+ drive loss is really different > from a conventional raid10 where it's either gonna completely work or > completely fail. Yes, thanks, CMurphy. That's exactly what I was trying to explain. =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman