Graham Keeling wrote: > On Fri, Oct 17, 2008 at 05:54:05PM +0200, Kern Sibbald wrote: > >> On Friday 17 October 2008 17:37:00 Graham Keeling wrote: >> >>> Hello, >>> Going back a couple of months, there was this short exchange: >>> >>> On Fri, Aug 15, 2008 at 10:49:50AM +0200, Kern Sibbald wrote: >>> >>>> On Friday 15 August 2008 10:36:36 Graham Keeling wrote: >>>> >>>>> It would be nice if it did let you read/write to the same storage if it >>>>> were possible - as it is in my case, as I am exclusively using >>>>> disk-based storage. >>>>> >>>> Unfortunately it is not possible to read and write to the same device, >>>> because on a tape it is just impossible, and on a disk, it requires two >>>> I/O packets. >>>> >>>> The above said, it is possible to read and write to the same disk >>>> directory providing the volumes are different. This is most easily >>>> accomplished by using something such as the virtual disk changer >>>> (disk-changer script), which provides two or more virtual drives. It is >>>> probably also possible by using the virtual disk device, which is a sort >>>> of automatic disk changer, but I don't use that code, so I hesitate to >>>> recommend it. >>>> >>> I've been trying to get the disk-changer script to work for me, looking at >>> the virtual backup regression tests for clues. >>> >>> Unless I'm wrong, it seems that you can't just schedule jobs and let it get >>> on with it, filling up the slots with data and switching between them, as >>> you have to manually enter commands to load, unload and label the slots. >>> >> No, it is totally automatic. >> > > Sorry, I don't believe that this is correct, and here are some reasons: > > If, for example, I comment out these lines in tests/virtual-backup-test... > > label storage=File volume=FileVolume001 Pool=Default > label storage=DiskChanger volume=ChangerVolume001 slot=1 Pool=Full drive=0 > label storage=DiskChanger volume=ChangerVolume002 slot=2 Pool=Full drive=0 > > ...then the test seems to get stuck when it tries to run the first job. I > connect to the director and it gives me the following message: >
Tapes (or disk-based volume files in this case) still have to be labeled. However, the labeling is automated using a tape device's barcode reader, (or emulation thereof), using the "label barcodes" Bacula console command. See http://www.bacula.org/en/rel-manual/Autochanger_Resource1.html#SECTION0032110000000000000000 > 20-Oct 10:36 localhost-dir JobId 1: Start Backup JobId 1, > Job=Vbackup.2008-10-20_10.36.03 > 20-Oct 10:36 localhost-dir JobId 1: Using Device "FileStorage" > 20-Oct 10:36 localhost-sd JobId 1: Job Vbackup.2008-10-20_10.36.03 waiting. > Cannot find any appendable volumes. > Please use the "label" command to create a new Volume for: > Storage: "FileStorage" (/usr/bin/bacula/regress/tmp) > Pool: Default > Media type: File > > > Secondly, there is this comment in the top of the disk-changer script: > # The Volumes will be created with names slot1, slot2, slot3, ... maxslot in > the > # base directory. > > But the virtual backup-test runs scripts/prepare-disk-changer at the > beginning, > which does the following: > #!/bin/sh > # > # Create fresh virtual disk changer directory > # > rm -rf tmp/disk-changer > mkdir tmp/disk-changer > # Create 10 slots > for i in 1 2 3 4 5 6 7 8 9 10 ; do > touch tmp/disk-changer/slot$i > done > > So, either the comment in the disk-changer script is wrong, or > prepare-disk-changer is unnecessary. > > > Thirdly, when I set up my bacula to use the disk-changer script, and run a > job, I get a comment in my log that looks similar to this section in the > 'kernstodo' file in svn: > > - Auto update of slot: > rufus-dir: ua_run.c:456-10 JobId=10 NewJobId=10 using pool Full priority=10 > 02-Nov 12:58 rufus-dir JobId 10: Start Backup JobId 10, > Job=kernsave.2007-11-02_12.58.03 > 02-Nov 12:58 rufus-dir JobId 10: Using Device "DDS-4" > 02-Nov 12:58 rufus-sd JobId 10: Invalid slot=0 defined in catalog for > Volume "Vol001" on "DDS-4" (/dev/nst0). Manual load my be required. > 02-Nov 12:58 rufus-sd JobId 10: 3301 Issuing autochanger "loaded? drive 0" > command. > > (after this point, my messages diverge with different problems - I can send > them to the list later) > > > >>> I've also tried to find out what you mean by 'the virtual disk device', but >>> I'm not able to find anything. Is there any documentation about this >>> anywhere? >>> >> At the top of the disk-changer script. >> > > I think you misunderstood me. Here is your original comment again: > > >>>> The above said, it is possible to read and write to the same disk >>>> directory providing the volumes are different. This is most easily >>>> accomplished by using something such as the virtual disk changer >>>> (disk-changer script), which provides two or more virtual drives. >>>> > ... > >>>> It is probably also possible by using the virtual disk device, which is >>>> a sort of automatic disk changer, but I don't use that code, so I >>>> hesitate to recommend it. >>>> > > You appear to be talking about two different things here. Firstly, the > 'virtual disk changer (disk-changer script)', and secondly, the 'virtual disk > device'. > > As I am having trouble getting the disk-changer script to work for me, I > thought that the alternative 'virtual disk device' that you mentioned could > be worth trying. There is no mention of such a thing at the top of the > disk-changer script. So what is the 'virtual disk device'? > > Thanks for any help, > Graham. > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Bacula-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/bacula-devel > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Bacula-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-devel
