>
> The hybrid system also has many other advantages including:
> - Allows Backuppc to work on OS's/FS's that don't support Unix-type
> hardlinks such as Windoze
Here is an important point. Using SQL to store metadata opens up the
platforms backuppc can run on. Considering that no filesystem is ideal for
backuppc because of the mix of I/O intensity, hardlinking needs, and
operating system support) it would be very nice to de-couple backuppc from
the filesystem. If an effort was made to put metadata on an SQL database,
you could even pick and choose your database based on preference and
performance. You could pick a filesystem that was best suited to the data
you planned to backup.
>
> - Allows for more expandable, robust, and faster storage of
> metadata. Continuing to expand attrib files to include ACL's and
> other extended attributes will just make the hack messier and
> slower.
how about small but incredibly fast I/O SSD drives for the database! SSD
are just too expensive to use with backuppc right now unless you can use ZFS
and use them for cache drives(which is extremely playform limited)
>
> - Allows for more granular security and access controls to backups
How about much much easier PHP work getting backup info and a faster
backuppc interface only having to hit the database for all its info and not
having to touch the filesystem. I would say that a lot of the security
bonuses CAN be done now but in a much more complicated way. I want to be
carefull not to make this a backuppc bash session because it is a great
utility.
One of the biggest concerns with backuppc that is constantly discussed on
this list is syncing the backup data between two or more servers. Simply
reducing the file count by eliminating the hardlinks would allow rsync to be
used reliably and effectively. SQL replication can keep metadata updated
constantly and a watchdog that monitors the SQL for changes could keep the
filesystems that store data synced easily as well. Once the metadata and
config moves to a database, so many things become very easy. A single
backuppc server could handle many more concurrent backups because multple
data storage devices can seperate IO and relieve the pressure on the IO
system of the OS.
I think if we can get enough support for a hybrid solution we may be able to
get developer support for this in backuppc4.
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