Solaris

Use format to modify the cylinders on the disk. Then user newfs to created your UFS filesystems.

where the snapshots we taken in zfs will be saved and how we can access that

thanks in advance
dinu

snapshots in zfs are saved as a dataset under the same zpool that the actual filesystems is on. It is just a point in time snap of the filesystem and only saves the actual changes that happened from the time the snap was taken. If you want to take a backup of you filesystem and mount it us the zfs send and zfs recieve commands. This will create a backup file of your snapshot and then you can import it back into a different zfs filesystem using the zfs recieve command. So something like below will create a filesystem, take a snap of it, then reimport it to a different filesystem.

Code:

zpool create testpool raidz c1t0d0s3 c1t1d0s3 c1t2d0s3 c1t3d0s3 
zfs create testpool/test
zfs set mountpoint=/test testpool/test
add data to /test here.......
zfs snapshot testpool/test@testsnap
zfs send testpool/test@testsnap > /tmp/test.snap
zfs receive testpool/newtest < /tmp/test.snap
zfs set mountpoint=/test1 testpool/newtest

You generally can't remove a disk from a pool, especially if you have no redundancy in place.

Is possible to create a raidz root pool and then place the os
in this pool?
With Linux i use raid5+lvm on root,with Solaris is possible
something like this?
Thanks

No, The root pool must be on either a single device pool or a mirrored one. The latter is obviously recommended. Raidz is unsupported. ZFS Troubleshooting Guide - Siwiki

Ok,thanks