Hi,
04.07.2008 13:18, Nils Blanck-Wehde wrote:
> Hi,
> I was talking about an backup job that backups the catalog to tape every
> hour....
> Could someone please tell me what's the problem of my tape-drive being
> /dev/st0?
It's a rewinding device, which means that each time the device is
closed (after a job) it gets rewound to BOT.
This requires Bacula to position the tape to the end of data for each
job. In the best case, this needs unnecessary time and causes
unnecessary tape wear.
In worse cases, when Bacula believes to know the tape position and
doesn't check, it will overwrite previous data on tape and cause -
obviously - unintended data loss. Furthermore, and luckily in this
case, in the end the catalog data will not agree with what is on tape
and the tapes will be marked as "Error".
Arno
> Best regards, Nils
>
> Arno Lehmann schrieb:
>> Hi,
>>
>> 04.07.2008 11:08, Kern Sibbald wrote:
>>
>>> On Friday 04 July 2008 10:50:52 Arno Lehmann wrote:
>>>
>>>> Hi,
>>>>
>>>> 04.07.2008 10:27, Kern Sibbald wrote:
>>>>
>>>>> If you are new to Bacula and/or you are having support problems, you will
>>>>> probably get much better answers from the bacula-users list. See
>>>>> www.bacula.org <http://www.bacula.org> -> Support. The bacula-devel list
>>>>> is specifically for
>>>>> development issues or issues that are clearly known to be a beta problem.
>>>>>
>>>> Well, we have discussed this issue at -users and I recommended to ask
>>>> here :-)
>>>>
>>>> The Bacula version running is 2.4.1b1, upgraded from 2.4.0.
>>>>
>>>> With 2.4.0, no problems.
>>>>
>>>> After the upgrade the mentioned problem arose.
>>>>
>>>> I trim the report below a bit to better show what I think is problematic.
>>>>
>>>> Without further checking, I got the impression that the volume
>>>> selection / reservation seems to be involved - and I believe you did
>>>> some work there.
>>>>
>>>> My conclusion: Looks like a new "feature" of the reworked SD code, and
>>>> you might prefer to know about it before releasing a 2.4.2 based on
>>>> this version...
>>>>
>>>>
>>>>> However, be aware that the information you sent is not complete enough
>>>>> for them to give a good answer. I suspect that you either lost or forgot
>>>>> to define the slot numbers in the catalog.
>>>>>
>>>> Assuming Nils didn't manually modify the catalog, Bacula itself lost
>>>> the slot numbers :-)
>>>>
>>>>
>>>>> Since your volume listing is
>>>>> clipped, I cannot confirm it.
>>>>>
>>>>> Thanks for trying the beta version -- good luck on getting it going.
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Kern
>>>>>
>>>>> On Friday 04 July 2008 09:49:11 Nils Blanck-Wehde wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>> ...
>>>>
>>>>
>>>>>> Bacula started a job that's supposed to be stored on tape, chose exactly
>>>>>> the right volume "CNV762" from the pool, purged and recycled it.
>>>>>>
>> This seems to indicate it's a backup job he's running, not a restore.
>> If a restore triggered recycling of the volume it's going to use we're
>> in deep trouble ;-)
>>
>>
>>> The
>>>
>>>>>> tape was even loaded correctly from the right slot into the drive.
>>>>>>
>>>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>>> Bacula knew about the slot.
>>>>
>>>>
>>>>>> Here's *list volumes of that pool:
>>>>>> | 28 | CNV762 | Recycle | 1 | 1 | 0
>>>>>> | 10,800 |
>>>>>> | 29 | CNV763 | Used | 1 | 3,982,261,248 | 4
>>>>>> | 10,800 |
>>>>>> | 30 | CNV764 | Used | 1 | 3,545,837,568 | 4
>>>>>> | 10,800 |
>>>>>> | 43 | CNV761 | Used | 1 | 3,982,841,856 | 4
>>>>>> | 3,600 |
>>>>>>
>>>>>> +---------+------------+-----------+---------+---------------+----------
>>>>>> +--
>>>>>>
>>>>>> Now, the job is waiting for the right volume to be mounted, which is
>>>>>> already in the drive.
>>>>>> The storage-device's status is:
>>>>>>
>>>>>> Device status:
>>>>>> Autochanger "QS3DLT" with devices:
>>>>>> "DLT-Drive-1" (/dev/st0)
>>>>>> Device "FileStorage_SATA-RAID1-MD1" (/var/bacula/File-Storage) is not
>>>>>> open. Device "DLT-Drive-1" (/dev/st0) open but no Bacula volume is
>>>>>> currently mounted.
>>>>>> Device is BLOCKED waiting for mount of volume "CNV762",
>>>>>> Pool: Weekly_Full_Backup_to_DLT
>>>>>> Media type: DLT-VS1
>>>>>> Slot 2 is loaded in drive 0.
>>>>>> Total Bytes Read=322,560 Blocks Read=5 Bytes/block=64,512
>>>>>> Positioned at File=0 Block=0
>>>>>> Device "DVD Writer" (/dev/hda) is not open.
>>>>>> ====
>>>>>>
>>>>>> In Use Volume status:
>>>>>> CNV762 on device "DLT-Drive-1" (/dev/st0)
>>>>>> Reader=0 writers=0 devres=1 volinuse=1
>>>>>>
>>>> All the information needed is there - CNV762 is in DLT-Drive-1,
>>>> DLT-Drive-1 wants this volume.
>>>>
>>>> Arno
>>>>
>>> Oh, I forgot to mention one thing. Using a /dev/st0 with an autochanger is
>>> very likely to get you into trouble.
>>>
>>>
>> I overlooked this... right.
>>
>> But directly after a volume is loaded it shouldn't matter much, I
>> believe :-)
>>
>> Arno
>>
>>
>
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