On Friday 19 January 2007 01:27, Arno Lehmann wrote:
> Hello,
>
> On 1/19/2007 12:19 AM, Benjamin Chambers wrote:
> > Thanks for the reply Arno.
> >
> > The manual certainly seems to be converging on the idea that USB and DVD
SD's
> > are handled similarly:
> >
> >
http://www.bacula.org/rel-manual/Storage_Daemon_Configuratio.html#SECTION001750000000000000000
>
> Right, but I guess the manual needs some work there. Or I'll have to
> look up Kerns mails regarding how he implemented better removable disk
> handling :-)
>
> > OK...not in the 18pt font header, but certainly in the content of the
> > documentation in the following sections...
>
> ... because "Requires Mount = Yes|No
> You must set this directive to yes for DVD-writers, and to no for
> all other devices (tapes/files). This directive indicates if the device
> requires to be mounted to be read, and if it must be written in a
> special way. If it set, Mount Point, Mount Command, Unmount Command and
> Write Part Command directives must also be defined." does not make
> sense. Unless, of course, you take the path I mentioned - use a special
> handler script to copy part files (which is more or less nonsense).
>
> Anyway, the above snippet states that when you set RequiresMount, the
> device "must be written in a special way". Which is not why you use
> removable USB devices... Also, it states that it must be set to no for
> files. Which contradicts the lines under the heading which you probably
> referred to.
>
> > Hmmm....
> >
> > Confused which direction to take.
>
> I'm quite sure Kern presented his way of using removable USB storage
> devices, and I suppose Joshs HowTo might be interesting.
Use the OS udev feature, tell Bacula the USB is a file, point it at the mount
point, and tell Bacula that it is removable, and things should more or less
work out OK. Tha is the OS will automatically mount it when it is plugged
in, and Bacula will ask you to mount it when it is not there, you plug it in
and the OS will mount it, then you enter "mount" in bconsole, and Bacula
should be happy.
If a different USB is mounted on the specified device (mount point), Bacula
will scan it to see if there are any appendable volumes (essentially
identical to the case of having a different tape in the drive). If there are
appendable volumes on the currently mounted USB device, Bacula will use them,
otherwise (provided you set it as removable), Bacula will request you to
mount the proper volume.
>
> Arno
>
> > B.
> >
> > Benjamin Chambers, P.Eng.
> > ClarkConnect Account Manager
> > Point Clark Networks
> > 1179 King Street West, Suite 211
> > Toronto, ON
> > Canada, M6K 3C5
> >
> > Tel: +1.416.977.0574 Ext. 111
> > Fax: +1.416.946.1192
> > Email: [EMAIL PROTECTED]
> >
> > Arno Lehmann wrote:
> >
> >>Hi,
> >>
> >>On 1/18/2007 11:07 PM, Benjamin Chambers wrote:
> >>
> >>>I'm doing some testing using v2.0.1 with a USB storage device. In this
case, it
> >>>is an Iomega REV USB drive, but essentially, it could be any USB mass
storage
> >>>device.
> >>>
> >>>Here is the configuration for the SD:
> >>>
> >>>Device {
> >>> Name = "_REV-USB"
> >>> MediaType = "Iomega REV, USB"
> >>> ArchiveDevice = "/dev/scd0"
> >>
> >>This is a configuration error.
> >>
> >>
> >>> LabelMedia = "yes"
> >>> RandomAccess = "yes"
> >>> AutomaticMount = "yes"
> >>> RemovableMedia = "yes"
> >>> AlwaysOpen = "yes"
> >>> DeviceType = "File"
> >>> RequiresMount = "yes"
> >>
> >>RequiresMount, MountPoint, unmountCommand are for DVDs only.
> >>
> >>
> >>> MountPoint = "/var/bacula/mnt/rev/usb"
> >>> MountCommand = "/bin/mount %a %m"
> >>> UnmountCommand = "/bin/umount %m"
> >>> MaximumVolumeSize = 70GB
> >>>}
> >>>
> >>>Note, I put the DeviceType = "File" because otherwise Bacula thinks it is
a DVD
> >>>device and requires the "Write Command" directive.
> >>
> >>Yes. Or rather, the directives above don't apply to file storage.
> >>
> >>
> >>>I know you *could* put the 'ArchiveDevice' directive as the mountpoint
(in this
> >>>case /var/bacula/mnt/rev/usb/), however, then you would required the user
to
> >>>mount/umount the device, or use the RunBefore/After scripts. Using the
> >>>similarities to DVD and the additional directives when "Requires Mount" =
yes is
> >>>so much more elegant.
> >>
> >>But it does not work.
> >>
> >>
> >>>The problem is that Bacula is trying to write to the device (/dev/scd0),
rather
> >>>than the mount point. The exact message when you try and label the
volume is:
> >>>
> >>>*********
> >>> Connecting to Storage daemon _REV-USB at 192.168.2.185:9103 ...
> >>> Sending label command for Volume "Default-0001" Slot 0 ...
> >>> 3910 Unable to open device "_REV-USB" (/dev/scd0): ERR=dev.c:482 Could
not
> >>> open: /dev/scd0/Default-0001, ERR=Not a directory
> >>>
> >>> Label command failed for Volume Default-0001.
> >>> Do not forget to mount the drive!!!
> >>>*********
> >>>
> >>>Has anyone got a USB mass storage device to work in 2.0.1?
> >>
> >>Not me, but I know of others. Well, I kind of have - I operate simple
> >>usb disks but without any special consideration regarding mounting etc.
> >>These are setups where the disks are not meant to be removed.
> >>
> >>Josh Fishers "Removable Disk Howto revised" is probably interesting for
> >>you - you find it searching in the list archives.
> >>
> >>
> >>>Can anyone tell me if this is:
> >>>
> >>> a) Corrected by fixing my configuration
> >>
> >>Yes. But probably diferent than what you intend.
> >>
> >>
> >>> b) Not an advised (or supported) method to mount USB mass storage
devices
> >>
> >>Yes.
> >>
> >>
> >>> c) An anomaly of the Iomega REV drive that is "part File, part DVD" in
> >>> terms of how Bacula treats the device
> >>
> >>Don't know.
> >>
> >>
> >>> d) A bug
> >>
> >>No.
> >>
> >>There's one other option, by the way: Try to understand how writing to
> >>DVD works for Bacula. Then, create a script similar to dvd-handler -
> >>basically, you could replace the invocations of growisofs with a cp, ge
> >>the available space using df, and so on.
> >>
> >>My original idea was that dvd-handler could be used as a template for
> >>low performance storage systems like ftp, CD-RW and others, but
> >>currently Bacula reads directly, so whatever media you use, you must be
> >>able to mount it for reading. Writing can be done by a handler script.
> >>
> >>Arno
> >>
> >>
> >>>Thanks in advance.
> >>>
> >>>Ben
> >>>
> >>
> >
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> --
> IT-Service Lehmann [EMAIL PROTECTED]
> Arno Lehmann http://www.its-lehmann.de
>
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