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 <n...@ser-tec.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?
>
>--
>Nicola Scattolin
>Ser.Tec s.r.l.
>Via E. Salgari 14/E
>31056 Roncade, Treviso
>http://dpidgprinting.com
>
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--
Phil Kennedy
Yankee Air Museum
Systems Admin
phillip.kenn...@yankeeairmuseum.org
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