Re: Speed of Backup

[Colin Percival <cperciva@tarsnap.com>]

On 02/26/14 05:04, Mike Kallies wrote:
> On Tue, Feb 25, 2014 at 4:36 PM, Colin Percival <cperciva@tarsnap.com> wrote:
>> On 02/25/14 03:15, Mike Kallies wrote:
>>> We're doing nightly backups using Tarsnap, approximately 100G of data.
>>>  The backups are taking a very long time, and the time has been
>>> increasing steadily since early January.
>>
>> Hmm...
>>
>>> Backups which would normally start around 9pm and finish around 5am,
>>> now start at 9pm and finish around 2:30pm.   There is not a huge
>>> amount of change in the files. (~1-2G or so per day)
>>
>> Is that 1-2 GB based on tarsnap's statistics (--print-stats), or based
>> on your internal reckoning of changing files?
> 
> Based on internal reckoning.
> 
> We had a DSL modem failure here, so there could have been packet loss
> going on.  Once we get the problem fixed properly, and have a clean
> backup without possible impact from packet loss I'll send the numbers.

Ok.  The --print-stats output will indicate both the total size of the
archive and also how much is being uploaded, so that will help to indicate
whether it's a problem constructing the archive or a problem uploading the
new bits.

>> Shouldn't be necessary... there's something weird going on for such a small
>> amount of data to take so long.
> 
> Small amount being 100G? or the 2GB of changes?

Yes to both. :-)

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid