How do I gmirror slices?

[R. B. Riddick]

--- Hansa <mythtv at logic-q.nl> wrote:
> > Van: R. B. Riddick [mailto:arne_woerner at yahoo.com]
> > > Offset       Size(ST)        End     Name  PType       Desc  Subtype
> > > Flags
> > >
> > >          0         63         62        -     12     unused        0
> > >         63   12578832   12578894    ad4s1      8    freebsd      165
> > >   12578895  147814065  160392959    ad4s2      8    freebsd      165
> > >  160392960  425706435  586099394    ad4s3      8    freebsd      165
> > >  586099395      15309  586114703        -     12     unused        0
> > >
> Considder my setup below:
> [----------------------- ad4 ----------------------] (disk)
> [--------- s1 ---------][---- s2 ----][---- s3 ----] (slices)
> [[--a--][--b--][--d--]*][[--- d ---]*][[--- d ---]*] (partitions)
> 
> I think the metadata is stored at '*'
> Is it one sector (512Bytes?) smaller than size(a) + size(b) + size(d) (same
> for s2d and s3d).
>
I would say: s1 is one sector larger than size(a)+size(b)+size(d).
And s2 is 1 sector (512B most likely; depends on ur disks) larger than size(d).
And s3 dito...

> # /dev/ad4s1:
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
>   a:  4192256        0    4.2BSD        0     0     0
>   b:  4192256  4192256      swap
>   c: 12578832        0    unused        0     0         # "raw" part, don't
> edit
>   d:  4194320  8384512    4.2BSD        0     0     0
>
Here we see, that d ends on the last sector of slice 1 (s1).
So u need to shrink partition d by one sector.
Since UFS might use that sector, u need an all new file system for partition
d...

Maybe u want to it like this:
1. fdisk ur new disk first
2. then setup the gmirror-s on the new disk (1. gmirror with only one slice per
mirror; 2. bsdlabel on the gmirror devices (u can use the full area, because
gmirror hides the last sector of the slice)).
3. then copy ad4s3d to some backup media.
4. then setup the gstripe or gconcat.
5. then copy the filesystems ad4s1a, ad4s1d and ad4s2d to the gmirror-ed
partitions mirror1a, mirror1d, mirror2d
6. then restore the backup for the gstripe
7. add the slices ad4s1 and ad4s2 to the gmirror
8. ready... :-)

-Arne


 
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