Strange behaviour with cpio

[MR VILLOT MR MONTAGNE]

Hi,

I need to copy data from file system to another.
I did :
# cd /d1 (old dir)
# find . -depth | cpio -pdumv /d1new

Copy was stopped (not enough space).
#bfd
/dev/vg01/lvol1 9216000 8941578 265934 97% /d1
/dev/vg04/lvol1 9420800 9420800 0 100% /d1new

mkfs -F vxfs -o ninode=unlimited,bsize=2048,version=3,inosize=256,logsize=1024,nolargefiles /dev/vg01/lvol1 9216000
mkfs -F vxfs -o ninode=unlimited,bsize=8192,version=3,inosize=256,logsize=256,largefiles /dev/vg04/lvol1 9420800

#diff /d1 /d1new
Common subdirectories: /d1/lost+found and /d1new/lost+found
Common subdirectories: /d1/ora_appli and /d1new/ora_appli
Common subdirectories: /d1/oracle and /d1new/oracle
Common subdirectories: /d1/was and /d1new/was

I do not understand why I do not have enough space. PE sizes are not the same : 4 Mb (vg01) and 8 Mb (vg04)

Thanks
Laurent

[Geoff Wild]

I would try it again like this:

cd /d1 ; find . -path ./d1 -prune -o -print | cpio -pdxm /d1new

Or maybe try it like so:

vxdump -0 -f - -s 1000000 -b 16 /d1| (cd /d1new ; vxrestore rf -)&

remove all files in /d1new first....

Rgds...Geoff

[John Poff]

Hi,

Maybe you have some sparse files in /d1 that are ballooning up to their expected full size when cpio writes them to the second filesystem?

JP

[Jeroen Peereboom]

Laurent,

If you are NOT copying another filesystem too (mounted under /d1, just type mount to see all mounted filesystems), another reason could be the blocksize of d1new being 4 times the block size of d1. The blocksize is the smallest amount of diskspace allocated to the file. This means that you waste more space on small files, which may become a problem if there are many files.

I do not know if all files occupy filesystem space in blocks of blocksize, but of course on large file you loose (procentually) less space.

Your PE size is only relevant to the LVM manager and determines the minimum size increase of an LV.

JP.

[Jeroen Peereboom]

Are Oracle datafiles sparse?

JP

[MR VILLOT MR MONTAGNE]

Thanks for your replies.

I think also that problem is size of blocksize. I am going to change my file system to have the same blocksize of original file system.

For sparse files, there are not Oracle Datafiles (not dbf). I do not know how to find quickly sparse files in my file system.

Laurent