Mirror of Raidz for data reliability

Adam Nowacki nowakpl at platinum.linux.pl
Sun May 13 17:56:46 UTC 2012


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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