Zitat von Alan Brown <ajb2 AT mssl.ucl.ac DOT uk>:

> On 21/08/12 17:46, lst_hoe02 AT kwsoft DOT de wrote:
>
>>> That means there's some room for improvement in despooling speed,
>>> but the big bottleneck at the moment is disk-fd and fd->sd, not
>>> sd->tape - the best achieved there is a sustained 52MB/s and that
>>> virtually maxes out a 1Gb/s NIC. Even if the network block sizing is
>>> optimized, I need to look at 10Gb NICs and for simultaneous
>>> spool/despooling.
>>
>> We plan to takle this one with parallel running jobs doing spooling to
>> SSD and despooling to tape. As far as i understand spooling/despooling
>> can happen in parallel if using different jobs.
>
> I already do this (7 drives, 6 pools), but it still means individual  
> TB-class jobs take too long to run.


Glad to here that we are not the first to try :-)
We also will have this problem at some point because 2/3 of our data  
is on a big filer (~2TB). But maybe it will help to create more than  
one job for this machine.


>>> WRT "offsite backups" - I'm more inclined to use a good firesafe in
>>> another building than pass media to a 3rd party company. Far too
>>> many people backup to tape but then don't take care of the media.
>>
>> Our's are in a Bank safe at the other end of the town and in the
>> future they are also encrypted thanks to Bacula :-)
>
> In the present they can be encrypted too, for LTO4 and higher.  
> Hardware encryption is a lot faster than software.

But the client side encryption has the advantage to secure the data  
already when traveling the network/leaving the machine. It could also  
prevent some malicous "restore on other machine" scenario. But  
admittetly this decreases overall speed, nothing comes for free.

Regards and thanks for the insights

Andreas



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