dump/restore, how to reduce slice size
ml at my.gd
Fri Sep 30 13:41:32 UTC 2011
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.
@OP, refer the following link for correct dump/restore syntax:
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