Date: Fri, 30 Sep 2011 15:41:26 +0200 From: Damien Fleuriot <ml@my.gd> To: freebsd-questions@freebsd.org Subject: Re: dump/restore, how to reduce slice size Message-ID: <4E85C706.9000809@my.gd> In-Reply-To: <20110929200920.GB46979@gizmo.acns.msu.edu> References: <1511250858.20110929223638@yandex.ru> <20110929200920.GB46979@gizmo.acns.msu.edu>
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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: http://www.wonkity.com/~wblock/docs/html/backup.html#_tt_dump_tt_with_compression
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