Slow hp lto with ntbackup...

Hi to all...
I've a speed trouble with ntbackup...
When i test the drive with the hp l&tt utility, i record a tranfer
rate of 30mb/s with compression 2:1, but when i use ntbackup i not get
more than ~3mb/s, and the tape stops often.
The lto is connected at the same bus of a lvd/se dds-4, the dat is
connected at 40mb/s, and the lto is connected at 80mb/s. (reported by
the scsi bios scan).
I use a 29160 scsi HBA.
I have the dds set with the 'term_power' jumper, and there is the
terminator at the end of the ribbon cable (certified for scsi 160 lvd/
se)..
I've tryed all driver configurations (with both windows drivers and hp/
adaptec dirvers, with no results)
The hard drives that has the data to be backed up are in raid-5
configuration, and are capable of 80mb/s...
Why with the hp test utility i get 30mb/s while with ntbacup i get
only 3mb/s?
Thanks to all!

"Masterx81" wrote in message
oups.com...
Hi to all...
I've a speed trouble with ntbackup...
When i test the drive with the hp l&tt utility, i record a tranfer
rate of 30mb/s with compression 2:1, but when i use ntbackup i not get
more than ~3mb/s, and the tape stops often.
[snip]
Why with the hp test utility i get 30mb/s while with ntbacup i get
only 3mb/s?
Thanks to all!


Because ntbackup needs to read real data from your disk, ntbackup uses small
tape blocks and ntbackup is a terrible piece of software. lt&t can use
random data or even all-zeroes directly from memory. Try real backup
software.

Rob

On 2 Ott, 15:37, "Rob Turk" wrote:
"Masterx81" wrote in message

oups.com...

Hi to all...
I've a speed trouble with ntbackup...
When i test the drive with the hp l&tt utility, i record a tranfer
rate of 30mb/s with compression 2:1, but when i use ntbackup i not get
more than ~3mb/s, and the tape stops often.
[snip]
Why with the hp test utility i get 30mb/s while with ntbacup i get
only 3mb/s?
Thanks to all!

Because ntbackup needs to read real data from your disk, ntbackup uses small
tape blocks and ntbackup is a terrible piece of software. lt&t can use
random data or even all-zeroes directly from memory. Try real backup
software.

Rob

After a lot more tests i've found a combination of drivers that let
work ntackup at his full speed...
But what do you suggest for backup? Veritas software?

Really thans for all the help that you give me!

"Masterx81" wrote in message
oups.com...

After a lot more tests i've found a combination of drivers that let
work ntackup at his full speed...
But what do you suggest for backup? Veritas software?

Really thans for all the help that you give me!


Ntbackup is the 'dumbed-down' version of Veritas BackupExec. You can use
BackupExec if you want to. BackupExec has decent support for clients,
databases etc.

Another option which I like is NetVault (www.bakbone.com). Works well, has
good performance and can be tested for free for 45 days. It does require a
bit getting used to, because the GUI is not a typical Windows GUI. Try it
and see how it works for you.

Rob