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Full Discussion: Backup and restore query
Operating Systems AIX Backup and restore query Post 302877115 by rbatte1 on Thursday 28th of November 2013 07:30:10 AM
Old 11-28-2013
And your question is ............?

Perhaps the space is used more efficiently when the files are restored. If the original files became fragmented with lots of partial disk blocks being written, then you could see a space used reduction after a restore as that would write full disk blocks and therefore use less of them.



Is this what you are after or have I missed the point? You made need to explain what you are seeing a little more.



Robin
 

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KFS(4)							     Kernel Interfaces Manual							    KFS(4)

NAME
kfs - disk file system SYNOPSIS
disk/kfs [ -rc ] [ -b n ] [ -f file ] [ -n name ] [ -s ] DESCRIPTION
Kfs is a local user-level file server for a Plan 9 terminal with a disk. It maintains a hierarchical Plan 9 file system on the disk and offers 9P (see intro(5)) access to it. Kfs begins by checking the file system for consistency, rebuilding the free list, and placing a file descriptor in /srv/name, where name is the service name (default kfs). If the file system is inconsistent, the user is asked for per- mission to ream (q.v.) the disk. The file system is not checked if it is reamed. The options are b n If the file system is reamed, use n byte blocks. Larger blocks make the file system faster and less space efficient. 1024 and 4096 are good choices. N must be a multiple of 512. c Do not check the file system. f file Use file as the disk. The default is /dev/sd0fs. n name Use kfs.name as the name of the service. r Ream the file system, erasing all of the old data and adding all blocks to the free list. s Post file descriptor zero in /srv/service and read and write protocol messages on file descriptor one. EXAMPLES
Create a file system with service name kfs.local and mount it on /n/kfs. % kfs -rb4096 -nlocal % mount -c /srv/kfs.local /n/kfs FILES
/dev/sd0fs Default file holding blocks. SOURCE
/sys/src/cmd/disk/kfs SEE ALSO
kfscmd(8), mkfs(8), prep(8), wren(3) KFS(4)
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