dump/restore, how to reduce slice size

[Jerry McAllister]

On Fri, Sep 30, 2011 at 03:41:26PM +0200, Damien Fleuriot wrote:

> 
> 
> On 9/29/11 10:09 PM, Jerry McAllister wrote:
> > On Thu, Sep 29, 2011 at 10:36:38PM +0300, ??????? ??????? wrote:
> > 
> >> Hi, Freebsd-questions.
> >>
> >> # df -h
> >> Filesystem     Size    Used   Avail Capacity  Mounted on
> >> /dev/ad4s1a      2G    206M    1.6G    11%    /
> >> devfs          1.0k    1.0k      0B   100%    /dev
> >> /dev/ad4s1e    3.9G     13M    3.6G     0%    /tmp
> >> /dev/ad4s1f     40G     25G     12G    67%    /usr
> >> /dev/ad4s1d     31G    3.6G     24G    13%    /var
> >> procfs         4.0k    4.0k      0B   100%    /proc
> >> /dev/ad2s1f     39G     25G     10G    71%    /mnt
> >> devfs          1.0k    1.0k      0B   100%    /var/named/dev
> >>
> >>
> >> as you can see /dev/ad4s1f is 40G and /dev/ad2s1f is 39G
> >> but on ad4s1f only 25G used.
> >>
> >> How can I dump /dev/ad4s1f and restore it on /dev/ad2s1f?
> >>
> >> These commands:
> >> #mount /dev/ad2s1f /mnt
> >> #cd /mnt
> >> #dump -0Lf - /usr | restore -rf -
> >> does not help, because of ad2s1f does not have space to restore
> >> 'end of ' /dev/ad4s1f.
> >>
> >> May help any?
> > 
> > Well, you are going to have difficulty putting 50 GB on a 39 GB partition.
> >    (25GB + 25GB = 50GB).
> > It won't work.
> > 
> > You could try compressing the dump, but dump files do not tend
> > to compress well and even if you got a 50% compression, you would
> > still be really close to overfill.
> > 
> > Probably you need to go to the store and get a nice big USB drive
> > and slice and partition it in to a bunch of 50 GB partitions and
> > pipe your dump to a restore in those partitions on that drive.
> > You can round-robin your backups to those USB partitions.
> > 
> > My backup to a USB hard drive just saved me the beginning of
> > this week when the old machine died of heat prostration.
> > 
> 
> 
> Dump is supposed to take only the used space.

???? Yes.  He already has 25 GB used on the partition and wants
to add another approx 25 GB in a 39 GB partition.  There ain't room.

////jerry

> 
> @OP, refer the following link for correct dump/restore syntax:
> http://www.wonkity.com/~wblock/docs/html/backup.html#_tt_dump_tt_with_compression
> 
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