Koenraad Lelong wrote:
Sampsa Riikonen schreef:
Dear List,
A question concerning data backups and transfer speed..
I am trying to do a backup using
Hi,
I also have a question about backup-speed. I use tar -cf /mnt/net.tar.bz2 --bzip2 --exclude="*.iso" /data/net to backup to a Iomega Rev-drive, connected via sata. I see the light every three or four seconds. Backup of about twenty GB takes hours. At work with the same type of drive via USB I can backup about 100GB in less time, with backup-software for Windows. There the light of the drive almost never goes out when backing up.
Is there a way to speed things up ?
Regards,
Koenraad Lelong.
P.S. I hope I didn't hi-jack this thread. Is so, I'll remember not to do this in the future.
Did you think bzip2 compression comes for free??? Typical unnamed backup software built-in compression either uses the hardware compression built-in to the tape drive (I don't remember if rev has hardware compression or not) Or, uses compression about equivalent to gzip -7 Also, real backup programs employ double buffering and multiple concurrent processes and other tricks to keep the hardware (both the source and the destination) as busy as possible. Use backupedge, not tar. At the very least you might try using star and piping through pbzip2 instead of using tar -j star -c /data/net |pbzip2 >/mnt/net.star.bz2 Neither star nor pbzip2 are probably installed on your machine already, but they are available. star is in the standard oss repos, which means if you go into yast and search, it'll probably already be there and you can just select it to be installed. pbzip2 is in obs Archiving repo which you will have to add to software sources first. http://download.opensuse.org/repositories/Archiving/openSUSE_11.2/ If pbzip2 is still too slow, switch to gzip, then gzip -7 (less compression than default) then lzop (less compression but very fast, better compression and speed than lower values for gzip). Or if your device supports it, use the devices built-in hardware compression instead of any software compression. -- bkw -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org