[Lessfs-users] LessFS - Linux VTL - Bacula

[Dimitri B. <dim...@gm...>]

Hi Mark
 many thanks for your great and very usefull work on Dedup!! I'm glade
to test your software because i work on storage department of big
company and i have test LessFs with NetApp NearStore R200 and must say
works great!! I have made a lot of test concerning of how Dedup works
on usually backup file, i have notice some strange behavior with tar
backup file but is common with netapp dedup.
For example if put a tar file A in dedup file system with some variant
i have found this:
- Tar file A 1000MB = Dedup OK as i aspect
- rename file A in B = near 0MB as i aspect
- cat file A in file B = 1000MB is not as i aspect because is the same
file only concat to the same file but renamed!!!

I repeat this is not a problem with LessFS but from my test i have
found the same result on NetApp.

But i go on in my test and i made a conjuct work with
linuxvtl.googlepages.com this is very good software for Tape Library
Emulation and works great with LessFS, i mount the Dedup file system
as based for emulated media type file.
Also using Bacula i have create a very cool Backup solution!!!
Also i have test everything with iscsi using scst software...and works
great!! I can able to export the Virtual Tape drive to Windows server
without problem i also can export the autochanger.
As i can do i want make a guide to create this all in one solution!!
Because is not simple to export via iscsi using scst...

The only minor/big feature for LessFS i think is needed are:
- Dedup filesystem tool (test DB and check it)
- Direct IO drive (no file based)


If you want i can make other test please ask me!!

Many thanks
Sincerely
Dimitri Bellini