you don't really need to do the prtvtoc and fmthard with the old Sun
labels if you start at cylinder 0 since you're doing a bit -> bit
copy with dd .. but, keep in mind:
- The Sun VTOC is the first 512B and s2 *typically* should start at
cylinder 0 (unless it's been redefined .. check!)
- The EFI label though, reserves the first 17KB (34 blocks) and for a
dd to work, you need to either:
1) dd without the slice (eg: dd if=/dev/rdsk/c0t0d0 of=/dev/rdsk/
c1t0d0 bs=128K)
or
2) prtvtoc / fmthard (eg: prtvtoc /dev/rdsk/c0t0d0s0 > /tmp/
vtoc.out ; fmthard -s /tmp/vtoc.out /dev/rdsk/c1t0d0s0)
.je
On Oct 22, 2006, at 12:45, Krzys wrote:
yeah disks need to be identical but why do you need to do "prtvtoc
and fmthard to duplicate the disk label (before the dd)", I thought
that dd would take care of all of that... whenever I used dd I used
it on slice 2 and I never had to do prtvtoc and fmthard... Juts
make sure disks are identical and that is the key.
Regards,
Chris
On Fri, 20 Oct 2006, Richard Elling - PAE wrote:
minor adjustments below...
Darren J Moffat wrote:
Asif Iqbal wrote:
Hi
I have a X2100 with two 74G disks. I build the OS on the first disk
with slice0 root 10G ufs, slice1 2.5G swap, slice6 25MB ufs and
slice7
62G zfs. What is the fastest way to clone it to the second disk. I
have to build 10 of those in 2 days. Once I build the disks I slam
them to the other X2100s and ship it out.
if clone really means make completely identical then do this:
boot of cd or network.
dd if=/dev/dsk/<sourcedisk> of=/dev/dsk/<destdisk>
Where <sourcedisk> and <destdisk> are both localally attached.
I use prtvtoc and fmthard to duplicate the disk label (before the dd)
Note: the actual disk geometry may change between vendors or disk
firmware revs. You will first need to verify that the geometries are
similar, especially the total number of blocks.
For dd, I'd use a larger block size than the default. Something
like:
dd bs=1024k if=/dev/dsk/<sourcedisk> of=/dev/dsk/<destdisk>
The copy should go at media speed, approximately 50-70 MBytes/s for
the X2100 disks.
-- richard
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