Date: Tue, 5 Aug 2008 11:40:13 +0200 From: Matthias Apitz <guru@unixarea.de> To: freebsd-hackers@freebsd.org Subject: restore of file system into USB key terrible slow Message-ID: <20080805094013.GA5654@rebelion.Sisis.de>
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Hello,
I'm trying to restore a DUMP into an USB key; the DUMP was extracted
from another USB key which I just want to colne this way;
the USB key type is:
Aug 5 10:53:34 rebelion kernel: da0 at umass-sim0 bus 0 target 0 lun 0
Aug 5 10:53:34 rebelion kernel: da0: < Cn Memory 1100> Removable Direct Access SCSI-0 device
Aug 5 10:53:34 rebelion kernel: da0: 40.000MB/s transfers
Aug 5 10:53:34 rebelion kernel: da0: 3871MB (7928832 512 byte sectors: 255H 63S/T 493C)
and I've created a partition (only one covering the full ~4 GByte) and a
file system as:
# newfs -m 0 -o space /dev/da0s1a
/dev/da0s1a: 3867.2MB (7919964 sectors) block size 16384, fragment size 2048
using 22 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
160, 376512, 752864, 1129216, 1505568, 1881920, 2258272, 2634624, 3010976, 3387328,
3763680, 4140032, 4516384, 4892736, 5269088, 5645440, 6021792, 6398144, 6774496,
7150848, 7527200, 7903552
# mount /dev/da0s1a /mnt
# cd /mnt
# restore -rv -f /home/guru/myThings/FreeBSD/tinyUsb.dmp
Verify tape and initialize maps
Tape block size is 32
Header with wrong dumpdate.
Dump date: Tue Aug 5 09:50:36 2008
Dumped from: the epoch
Level 0 dump of /mnt on rebelion.Sisis.de:/dev/da0s1a
Label: none
Begin level 0 restore
Initialize symbol table.
Extract directories from tape
Calculate extraction list.
warning: ./.snap: File exists
Make node ./var
Make node ./var/account
Make node ./var/at
Make node ./var/at/jobs
Make node ./var/at/spool
Make node ./var/audit
the restore is *terrible* slow, aound 200 blocks per second:
$ df -k /mnt ; sleep 60 ; df -k /mnt
Filesystem 1024-blocks Used Avail Capacity Mounted on
/dev/da0s1a 3829660 454 3829206 0% /mnt
Filesystem 1024-blocks Used Avail Capacity Mounted on
/dev/da0s1a 3829660 642 3829018 0% /mnt
Am I doing something wrong?
What means 'Header with wrong dumpdate'?
matthias
--
Matthias Apitz
Manager Technical Support - OCLC GmbH
Gruenwalder Weg 28g - 82041 Oberhaching - Germany
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
e <matthias.apitz@oclc.org> - w http://www.oclc.org/ http://www.UnixArea.de/
b http://gurucubano.blogspot.com/
We should all learn from the peoples of The Netherlands, France and Ireland.
Aprendamos todos de los pueblos de Holanda, Francia e Irlanda.
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