On 03/14/2013 08:32 PM, John Drescher wrote:
> On Thu, Mar 14, 2013 at 3:04 PM, Sergio Belkin <sebelk AT gmail DOT com> 
> wrote:
>> Hi folks,
>>
>> The performance is very poor, its around 6MB/s !!!
>> The tape device is an IBM ULT3580-HH5
>>
>> Host: scsi3 Channel: 00 Id: 00 Lun: 00
>>    Vendor: IBM      Model: ULT3580-HH5      Rev: BBN3
>>    Type:   Sequential-Access                ANSI SCSI revision: 06
>>
>> Bacula version is 5.2.13
>>
>> My sd daemon config:
>>
>> Storage {                             # definition of myself
>>    Name = clair.example.edu-sd
>>    SDPort = 9103                  # Director's port
>>    WorkingDirectory = "/usr/local/opt/bacula/working"
>>    Pid Directory = "/var/run"
>>    Maximum Concurrent Jobs = 20
>> }
>> Director {
>>    Name = noc-dir
>>    Password = "something"
>> }
>> Director {
>>    Name = clair.example.edu-mon
>>    Password = "something"
>>    Monitor = yes
>> }
>> Device {
>>    Name = LTO5
>>    Media Type = LTO-4
>>    Archive Device = /dev/IBMtape0n
>>    AutomaticMount = yes;               # when device opened, read it
>>    AlwaysOpen = yes;
>>    RemovableMedia = yes;
>>    RandomAccess = no;
>>    Maximum File Size = 200GB
>>   Alert Command = "sh -c 'smartctl -d scsi -H -l error /dev/sg6'"
>> }
>> Messages {
>>    Name = Standard
>>    director = clair.example.edu-dir = all
>>
>>
>> Using netcat I've found that network speed is around 100 MB/s
>>
>> Could you help to find a solution?
> You need to enable spooling and to run your jobs concurrently. Also
> set the Maximum block size and Minimum block size. On top of that I
> would not have set Maximum File Size = 200GB set that to a few GB or
> leave that parameter alone.
>
> John
>
>
100Mbit network gives ~10MB/sec on an unloaded network. Practically it's 
somewhere around 6-8MB/sec
so speed seems ok, specially if you have smaller files. So as John says. 
use spooling.

/Carsten




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