Good Morning Martin
I do not remember which platform you are using for you media
servers.
On solaris using the st driver the use of hardware compress
depends on which device name you are using. from the following any of the dev
entries with the "c" will call for hardware compression. In netbackup
we use /dev/rmt/0cbn
len
> ls -l /dev/rmt/0*
lrwxrwxrwx 1 root root 68 Jul 26 2007 /dev/rmt/0
-> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0b -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:b
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0bn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:bn
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0c -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:c
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0cb ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:cb
lrwxrwxrwx 1 root root 71 Jul 26 2007
/dev/rmt/0cbn -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:cbn
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0cn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:cn
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0h ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:h
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0hb ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:hb
lrwxrwxrwx 1 root root 71 Jul 26 2007
/dev/rmt/0hbn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:hbn
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0hn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:hn
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0l ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:l
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0lb -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:lb
lrwxrwxrwx 1 root root 71 Jul 26 2007
/dev/rmt/0lbn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:lbn
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0ln -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:ln
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0m ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:m
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0mb ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:mb
lrwxrwxrwx 1 root root 71 Jul 26 2007
/dev/rmt/0mbn -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:mbn
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0mn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:mn
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0n -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:n
lrwxrwxrwx 1 root root 69 Jul 26 2007
/dev/rmt/0u ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:u
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0ub ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:ub
lrwxrwxrwx 1 root root 71 Jul 26 2007
/dev/rmt/0ubn ->
../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w500507630f44a605,0:ubn
lrwxrwxrwx 1 root root 70 Jul 26 2007
/dev/rmt/0un -> ../../devices/pci@9,600000/SUNW,qlc@1/fp@0,0/st@w5
From:
veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu]
On Behalf Of Martin Ruslan
Sent: Monday, February 25, 2008 11:45 PM
To: Justin Piszcz
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] LTO tapes handling more that it supposed
Dear Justin,
sounds make sense for the hardware compression.
but, I never set the hardware compression on the NBU. Did the compression do it
self without any configuration triggered?
I mean, is it running automatically for few types of files or datas?
And this is happening not to all tapes.. only few tapes..
some is oracle database, and some is windows flatfile.
@Simon:
hopefully not David Copperfield who make strange thing happens on my backup..
:)
@everyone:
So this is normal if it's a database backup? (specially oracle).
just trying to describe all the inputs.. :)
Rgrds,
Martin
On Mon, Feb 25, 2008 at 7:04 PM, Justin Piszcz <jpiszcz AT lucidpixels DOT com> wrote:
On Mon, 25 Feb 2008, Martin Ruslan wrote:
> Dear gurus,
> have you ever meet this condition?
> My LTO3 tapes handling more than 800GB (about 1.2TB) on the media's
report.
> I don't have any idea for this.. The backup not running the compression
> also..
> Is it maybe the block size or something? Need your advice..
>
> Regards,
> Martin
>
The tape drive does compression. We see upwards of
3.0++ to 1 in some
cases.
Justin.