dump/restore, how to reduce slice size
jerrymc at msu.edu
Fri Sep 30 14:28:02 UTC 2011
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.
> @OP, refer the following link for correct dump/restore syntax:
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