Subject: Re: [Bacula-users] About tapes capacity



Am 20.04.2011 16:31, schrieb Jason Voorhees:
> On Wed, Apr 20, 2011 at 9:22 AM, Paul Mather <paul@xxxxxxxxxxxxxxxxxx> wrote:
>> On Apr 20, 2011, at 10:17 AM, Jason Voorhees wrote:
>>
>>> Hi people:
>>>
>>> I'm running Bacula 5.0.3 with an tape library IBM TS3100 using LTO5
>>> tapes of 1.5 TB capacity each one. I have a simple question: If I run
>>> a job backup of a server that holds more than 1.5 TB (example: 2 TB of
>>> data), what happen when Bacula reaches the limit of the tape capacity?
>>> Does Bacula automatically change the tape?
>>>
>>> I'm not pretty sure about this because I recently ran a job backup of
>>> 2 TB and Bacula apparently just used one tape: have a look at my
>>> volume listing:
>>>
>>> * list volume
>>> ...
>>> ...
>>> | 5 | L5BA0005 | Append | 1 | 2,058,019,117,056 |
>>> 2,059 | 2,160,000 | 1 | 5 | 1 | LTO-5 |
>>> 2011-04-19 20:58:51 |
>>> +---------+------------+-----------+---------+-------------------+----------+--------------+---------+------+-----------+-----------+---------------------+
>>>
>>> When the job started Bacula took the tape L5BA0005 and never required
>>> another one. As you can see Bacula apparently wrote 2,058,019,117,056
>>> bytes (approx. 2 TB) but my tape is just 1.5 TB capacity. Does anybody
>>> know why? My job isn't using compression so I really don't understand
>>> this.
>>
>> The job may not be using compression but the tape drive itself may have
>> compression enabled, which could account for being able to write 2 TB to the
>> LTO-5 tape.
>>
>> (The 1.5 TB capacity is the native capacity of an LTO-5 tape without
>> hardware compression enabled.)
>>
>> Cheers,
>>
>> Paul.
>>
>>
> Hi, excuse me if I'm a newbie on this but, how and where can I verify
> if hardware compression is enabled? It would be on the web
> administration of my tape library?
>
> Thanks
>
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Hi,

here sudo tapeinfo -f /dev/sg1 shows:

Product Type: Tape Drive
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes

for example.

you have to find out which device you need to use.

greetings.

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Benefiting from Server Virtualization: Beyond Initial Workload
Consolidation -- Increasing the use of server virtualization is a top
priority.Virtualization can reduce costs, simplify management, and improve
application availability and disaster protection. Learn more about boosting
the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev
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