Date: Sun, 13 May 2012 19:46:52 +0200 From: Adam Nowacki <nowakpl@platinum.linux.pl> To: freebsd-fs@freebsd.org Subject: Re: Mirror of Raidz for data reliability Message-ID: <4FAFF38C.3060002@platinum.linux.pl> In-Reply-To: <CAOfEmZh8v5xbQqkJJ7ZKkan7Ho0FPNrXJ95S1WRpioDXVG6P7w@mail.gmail.com> References: <CAOfEmZh8v5xbQqkJJ7ZKkan7Ho0FPNrXJ95S1WRpioDXVG6P7w@mail.gmail.com>
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Wouldn't this accomplish the same? zpool create tank raidz da0 da1 da2 raidz da3 da4 da5 zfs set copies=2 tank On 2012-05-13 19:35, Marcelo Araujo wrote: > Hi All, > > Me and a co-work are working in a new feature for ZFS, we have 2 Machines > and 2 JBOD, every Machine are connected on those JBOD via SAS and we are > trying to make a fail-over server. Currently every each Machine has two SAS > cables, each one connected in both JBOD. > > We have worked last week to figure out, how we could make the data be > always alive in case one JBOD dies, and let me show you my console output > ;): > > controllerA# zpool status -v araujo > pool: araujo > state: ONLINE > scan: resilvered 57K in 0h0m with 0 errors on Sat May 12 14:32:29 2012 > config: > > NAME STATE READ WRITE CKSUM > araujo ONLINE 0 0 0 > raidz1-0 ONLINE 0 0 0 > mirror-0 ONLINE 0 0 0 > da0 ONLINE 0 0 0 > da3 ONLINE 0 0 0 > mirror-1 ONLINE 0 0 0 > da1 ONLINE 0 0 0 > da4 ONLINE 0 0 0 > mirror-2 ONLINE 0 0 0 > da2 ONLINE 0 0 0 > da5 ONLINE 0 0 0 > > > What I have is: A file system called "araujo" created using raidz with 3 > disks, than, I can attache new disks to create a mirror for every disk that > is part of the raidz, with this case, if one of my JBOD fail, my raidz will > still alive, also I can scale with more JBOD to make sure that my data will > be always alive. > > Currently is possible to do the solution above, just comment few lines of > code, but our plan is bring something new like: > root# zpool create tank raidzm da0 da1 da2 da3 da4 da5 > > Where da0 da1 da2 will be raidz and da3 da4 da5 will be mirror of da0 da1 > da2. In this case, if da0 da1 or da2 fail, we have the mirror and the raidz > will still works. > > I’m wondering if there is any other elegant solution for this case, HAST > could be an option, but I don’t want use ETHERNET to sync JBOD, and in the > case above, it is faster to sync any hard driver more less locally. > > > Best Regards,
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