On Friday 09 October 2009 15:06:36 Nicolae Mihalache wrote:
> Sorry, I'm not quite sure I grasp your message.
> When you refer to Storage in "Changing Storage for restore and
> migration", you talk about Storage Daemon or the Storage resource in the
> director?
I was not very precise. I meant that changing Storage daemons is not
supported in any released version. Changing storage devices is also not
officially supported in any released version, but there is code that seems to
work in most cases.
>
> I have one Storage Daemon with three different devices and three
> corresponding storage resources in the director. What I want to do is to
> read from two of those devices and write into the third one.
> Changing between the two reading ones is not working. I did a bit of
> debugging, and I found that:
>
> In stored/acquire.c
>
> stat = search_res_for_device(rctx);
> release_reserve_messages(jcr); /* release queued messages */
> unlock_reservations();
>
> if (stat == 1) {
> dev = dcr->dev; /* get new device pointer */
>
> In stored/reserve.c:
>
> ok = reserve_device_for_read(dcr);
> if (ok) {
> rctx.jcr->read_dcr = dcr;
>
>
> So basically the jcr->read_dcr is changed to point to a brand new dcr in
> reserve.c but the code in acquire.c is using the old dcr. Also in
> acquire.c there is a comment that says dcr pointer shouldn't change.
If indeed the code in reserve.c is setting an entirely new dcr pointer, then
it is unlikely the code will work. So that may be the problem you are
running into. However, in all our tests, it does seem to work providing you
have different MediaTypes for each device. Though as I say, it is not
officially supported, simply because I don't have enough confidence in the
code. If you have the same MediaType for different devices, then switching
devices won't work.
Regards,
Kern
>
>
> nicolae
>
> Kern Sibbald wrote:
> > Hello,
> >
> > You are attempting to use a feature that is not implemented.
> >
> > Changing Storage for restore and migration is not implemented in any
> > released version of Bacula.
> >
> > Changing of Storage for restore is implemented in 3.1.x (not yet
> > released). However, it is unlikely that it works for migration.
> >
> > Changing of devices within a given Storage should be implemented, for
> > reading of any kind, but we do not guarantee that it works -- in your
> > email, you did not specify much information so I cannot be more specific.
> >
> > Regards,
> >
> > Kern
> >
> > On Friday 09 October 2009 12:37:50 Nicolae Mihalache wrote:
> >> Hello,
> >>
> >> I run Full backups on MediaType=LOT-4 and Incremental backups on
> >> MediaType=File. When running a VirtualFull into a tmp pool
> >> (MediaType=TmpFile), bacula starts correctly reading the full backup
> >> from LTO-4. However, when the Incremental starts, it still wants to use
> >> the LTO-4 device instead of switching to the file device:
> >>
> >> 09-Oct 11:43 bacula-sd JobId 8889: End of Volume at file 46 on device
> >> "HP" (/dev/st0), Volume "GROUPS-01" 09-Oct 11:44 bacula-sd JobId 8889:
> >> acquire.c:116 Changing read device. Want Media Type="File" have="LTO-4"
> >> device="HP" (/dev/st0) 09-Oct 11:44 bacula-sd JobId 8889: Media Type
> >> change. New read device "HP" (/dev/st0) chosen. 09-Oct 11:44 bacula-sd
> >> JobId 8889: Invalid slot=0 defined in catalog for Volume "aa-work-0125"
> >> on "HP" (/dev/st0). Manual load may be required.
> >>
> >> >From these logs it seems it wants to change the read device but for
> >> > some
> >>
> >> reason selects the same (wrong) one.
> >>
> >>
> >> Thanks for any hints.
> >> nicolae
>
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