dump/restore, how to reduce slice size

Jerry McAllister jerrymc at msu.edu
Thu Sep 29 20:10:29 UTC 2011

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.



> -- 
> Konkov                          mailto:kes-kes at yandex.ru
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