On 1/27/22 14:45, Pedro Oliveira wrote:
Why not use mhtvl or quadstor
https://quadstor.com/virtual-tape-library.html
http://www.mhvtl.com
they are nice solutions and integrate well with Bacula
It depends on what is needed. These VTLs are more complex and use a
kernel module that I don't think is in the mainline kernel. They are not
as convenient as vchanger for backing up to removable hot-swap media.
For backing up to a single filesystem, Bacula has a native disk
autochanger. On the other hand, they can be used as a iSCSI-attached SAN
device for large networks with multiple subnets and multiple Bacula
Storage Daemons. It just depends on the environment.
Josh Fisher <jfis...@jaybus.com> escreveu em qui., 27/01/2022 às 18:50 :
On 1/26/22 12:42, dmitri maziuk wrote:
> On 2022-01-26 11:06 AM, Peter Milesson via Bacula-users wrote:
>>
> ...
>> Your way of explaining the reasoning of why to use smaller file
>> volumes, is very appreciated.
> ...
>
>> The only thing I haven't found out is how to preallocate the
number
>> of volumes needed. Maybe there is no need, if the volumes are
created
>> automagically. Most of the RAID array will be used by Bacula, just
>> leaving a couple of percent as free space.
>
> If you use actual disks as "magazines" with vchanger, you need to
> pre-label the volumes. If you use just one big filesystem, you
can let
> bacula do it for you (last I looked that functionality didn't
work w/
> autochangers).
Automatic labeling doesn't work, but vchanger supports barcodes
like a
tape autochanger. The virtual barcodes are just the filenames of the
volume files on the disk "magazine". So the 'label barcodes' command
works with vchanger the same as a tape autochanger. The vchanger
'createvols' command both creates the volume files and then invokes
bconsole and issues the label barcodes command. A single command
creates
and labels the volume files, so it is not so bad.
>
> If you use disk "magazines" you also need to consider the
whole-disk
> failure. If you use one big filesystem, use RAID (of course) to
guard
> against those. But then you should look at the number of file
volumes:
> some filesystems handle large numbers of directory entries
better than
> others and you may want to balance the volume file size vs the
number
> of directory entries.
That is true if physical disks are used as magazines. Vchanger mostly
targets removable drives, such as USB, RDX, or hot-swap SAS JBOD. In
that case, exposure to whole-disk failure is mitigated by having
multiple backups and using Copy jobs.
But it is also possible to use vchanger with iSCSI volumes as
magazines.
I use iSCSI for some magazines and portable USB drives for other
magazines that are used for offline and off-site storage. The iSCSI
volumes are on RAID10/LVM, but they could easily be ZFS volumes too.
>
> For single filesystem, I suggest using ZFS instead of a traditional
> RAID if you can: you can later grow it on-line by replacing
disks w/
> bigger ones when (not if) you need to.
>
> Dima
>
>
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