Il 30/05/2013 14:10, Phil K. ha scritto:
> Just to take things in a different direction;
>
> What do your transfer logs say? Is this an OS disk, or is it strictly
> data? If you're seeing strings of errors when reading files (crypto and
> AV related files are notorious for this) You may want to adjust your
> include / exclude files. This will improve read time and, by proxy,
> transfer times.
> ~Phil
>
> Nicola Scattolin <nick AT ser-tec DOT org> wrote:
>
> Il 30/05/2013 12:56, Adam Goryachev ha scritto:
>
> On 30/05/13 18:13, Nicola Scattolin wrote:
>
> Il 30/05/2013 10:04, Adam Goryachev ha scritto:
>
> On 30/05/13 16:57, Nicola Scattolin wrote:
>
> hi,
> i have a problem in full backups of a 2TB disk.
> when backuppc do fullbackup it takes on average
> 1866.0 minutes while the
> incremental backup takes around 20 minutes.
> do you think there is something wrong or it's just
> for the amount of
> data to be backupd?
>
> Most likely this is a limitation of bandwidth, CPU, or
> memory on either
> the backuppc server, or the machine being backed up.
>
> Have you enabled checksum-seed in your config?
> Are you even using rsync?
>
> Remember a full backup will read the full content of
> every file (talking
> about rsync because I will assume that is what you are
> using) on both
> the client and backuppc server. A incremental only looks
> at file
> attributes such as size and timestamp.
>
> Can you be more detailed about your configuration, and
> during a full
> backup look at memory utilisation on both backuppc
> server and the client.
>
> PS, this question is asked regularly, so you should also
> look at the
> archives to see the previous discussions (which have
> been very detailed,
> and sometimes heated).
>
> Regards,
> Adam
>
>
> i use smb to transfer file, and there are not be cpu or
> bandwidth
> limitation, it's a local server.
> where is the checksum-seed option? i can't find it
>
>
> OK, so this is even more obvious.
>
> An incremental will only look at the timestamp, and transfer all
> files
> newer than the timestamp of the previous backup.
> A full will transfer ALL files, therefore this is disk I/O + network
> bandwidth limited.
>
> 2TB of data will take 335 minutes at 1Gbps (assuming you can
> read from
> the source disk at least 1Gbps, and write to the destination disk at
> 1Gbps, and utilise 100% of source/destination disk bandwidth as
> well as
> 100% of network bandwidth, and there was nil overhead for
> handling each
> individual filename/etc...
>
> You are getting just under 20MB/sec, which is probably not
> unreasonable.
>
> As mentioned, if you want it faster, you will need to determine
> where
> the bottleneck is, which means looking at disk IO (most likely),
> network
> bandwidth, CPU (especially if you use compression on the backuppc
> server), etc...
>
> Regards,
> Adam
>
>
>
> i have checked the disk usage and the i/o that backuppc output me in the
> summary page, and 7.37 is Mb/sec is the value i got.
> The server is virtualized but the hardisk is linked directly to the
> virtual machine in mirroring raid, do you thing is a good speed or could
> be better?
>
>
> --
> Phil Kennedy
> Yankee Air Museum
> Systems Admin
> Phillip.kennedy AT yankeeairmuseum DOT org
>
> Sent from my Android phone with K-9 Mail.
>
>
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i got errors reading 1 directory, but i don't think it spin up my backup
time so much
--
Nicola Scattolin
Ser.Tec s.r.l.
Via E. Salgari 14/E
31056 Roncade, Treviso
http://dpidgprinting.com
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