Hi,
My solairs10 box experienced loing disk clone by dd command.

My workstation is SB100 which have primary and slave ATA100 IDE 80GB seagete disks on the same bus. I used the following command to copy
c0t0d0 disk data to c0t2d0.

ok boot cdrom -s
# dd if=/dev/rdsk/c0t0d0s2 of=/dev/rdsk/c0t2d0s2 bs=1024

But I was waiting for almost 5 hours but prompt still not returned to me. I Ctrl+C to cancell the operation and I checked c0t2d0s0, I seems that it has been sync with c0t0d0s0. I wonder why dd took so long to do the sync. Whether dd has some option can let me to monitor the data copy status.
Any idea?

In your command line dd is copying 1024 bytes blocks. Try bs=1024k

dd is a very terrible way to copy data between disks, it can lead to many problems and data inconsistence later...

best way to do this in solaris is to use ufsdump

something like

cd /yourdir
ufsdump 0f - /yourdir | (cd /dirbackup;ufsrestore rvf -)

you could optimize it to use fssnap as well if you want to backup a live FS that is being used.

Any particular reason not to mirror the disks?

-Raymond

Just want to see what dd can do. Really, mirror the disk is best.