> -----Ursprüngliche Nachricht----- > Von: lbackup-discussion-boun...@lists.connect.homeunix.com > [mailto:lbackup-discussion-boun...@lists.connect.homeunix.com] Im > Auftrag von henri > Gesendet: Montag, 31. Jänner 2011 11:06 > An: lbackup-discussion@lists.connect.homeunix.com > Betreff: Re: [lbackup-discussion] Some beginner questions (OS & backup > rotation) > > > > 2. I noticed significant differences in speed between BIT and lbackup: > > For a set of 23Gb I needed 69mins with lbackup, but only 24mins with > > BIT. Both programs use rsync and hardlinks, and it was the first > > backup for both programs. What could lead to this big difference? Some > > hashing, something else? > > This is very interesting. Did you run LBackup first and then try back in time? > Perhaps after LBackup ran the system had then cached a lot of the data from > the source disks? Just a thought. > > In my opinion, 69 min seems like a long time to transfer 23 gigabytes of data?
Thanks for your reply: Ok my setup in short: 2 RAID-Hdds bound to a RAID-1 (Softraid-->mdadm) 1 "normal" Hdd with 4KiB-Blocks (instead of 512 byte) - WD10EARS Prozessor is an Atom D510 (Dualcore with 1,66Ghz) Data: Around: 23GB Files: 145.056 Directories: 51.882 It seems you are right, there must be some caching, I startet BIT after LBackup. If I do a normal "rsync -av /src /dest" I go somewhere to 45 min. It seems that there must be a sort of bottleneck ... The source is on my "normal" Hdd on a 2nd Partition, I did some "dd if=/dev/zero of=/source ..." writing zeros of 16Gb and this partition is really slower, I thought I've alligned this partition correctly to the 4KiB-blocks, but maybe not. If I do a rsync when source and dest is on the same partition on my RAID I get something around 15mins. Could the ATOM-Processor be my problem? Otherwise a lot of SOHO-NAS have Atoms with lower speeds ... What would you see as a "good" speedvalue for this set of data? I think you've more experience with rsync than me... Any thoughts about speeding rsync up? > If use rsync to perform a copy of 23 gigabytes how long will take? > > Did you have the checksum option enabled in your LBackup configuration? It is commented out: # checksum_enabled="NO" The default-value is No, isn't it? So I assume it is turned off. > > > > _______________________________________________ > lbackup-discussion mailing list > http://www.lbackup.org > > Change options or unsubscribe : > http://lbackup.org/mailing_lists _______________________________________________ lbackup-discussion mailing list http://www.lbackup.org Change options or unsubscribe : http://lbackup.org/mailing_lists
