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DLT1 changed to DLT7000 and capacity dropped?

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Simon Shilton

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Jan 12, 2004, 11:01:38 AM1/12/04
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I have just swapped out a Dell PowerVault 120T DLT1 autoloader for a PowerVault 120T DLT7000 autoloader on a BE9.0 NW6 system
 
The DLT1 got around 48GB onto a single DLT IV tape, the DLT7000 only gets around 44GB onto a DLT IV tape, and I was expecting a bit increase in capacity
 
tried:
cleaned drive with cleaning tape
brand new DLT tapes
checking Density on drive - set at 35C, so expect up to 70GB backup
NW drivers
SCSI card bios
 
I am backing up the same source files, throught the same server, using the same program onto a device which is supposed to support higher density and larger capacities, but I have seen a drop in capacity
 
anybody have any ideas or suggestions?
 
many thanks
 
Simon
 

aeg...@yahoo.com.au

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Jan 12, 2004, 9:23:40 PM1/12/04
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Simon,

The native capacity of a DLT7000 is actually less than a DLT1.
For a DLT7000 its 35G and for a DLT1 its 40G. That would be why
you have less on the tape.

Regards,

Bryan

Simon Shilton

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Jan 13, 2004, 5:21:25 AM1/13/04
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Bryan,
 
thanks for the info, even if it is very disappointing :-)
 
guess I will have to look at a 2 tape full backup on Friday and incrementals through the week
 
all the best
 
Simon

>>> <aeg...@yahoo.com.au> 13/01/2004 02:23:40 >>>

Dirk Hümmer

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Jan 14, 2004, 8:04:45 PM1/14/04
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Simon,
 
if you think about a change from daily full backup, we have a few 120Ts and I use this scenario - however I dunno about possible options in BE:
 
Weekly full backup, daily differential backup (I have decided to use archiv bit based) - easier restore than incrementals.
If possible you may think about appending the incremental/differential jobs. With a 2 tape full backup I can use the library for two weeks without visiting it (3 tapes per week, 1 blank extra, 1 cleaning).
 
Just a suggestion
Dirk
 
 
 
 

Simon Shilton

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Jan 20, 2004, 11:12:25 AM1/20/04
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Dirk
 
many thanks for that suggestion I think I may well be going in that direction
 
cheers
 
Simon


>>> Dirk Hümmer<o...@cb-clan.de> 15/01/2004 01:04:45 >>>

Simon Shilton

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Jan 27, 2004, 4:31:52 AM1/27/04
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Dirk
 
If you do not use BE, what do you use?
 
I am having difficulties getting BE to work in this scenario, if I set up a policy for differentials, it wants to set a Full backup as part of the policy, which means the differentials go onto the same media set as the Full backups
 
thanks
Simon


>>> Dirk Hümmer<o...@cb-clan.de> 15/01/04 01:04:45 >>>

Michael

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Jan 27, 2004, 5:07:57 AM1/27/04
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Simon
> I am having difficulties getting BE to work in this scenario,
> if I set up a policy for differentials, it wants to set a
> Full backup as part of the policy, which means the differentials
> go onto the same media set as the Full backups

Use the NetWare Admin Console to set that policy instead - the Java
Admin Console won't allow policies to only consist of Incremental or
Differential backup methods without a full.

Michael
--
"If it jams, force it. If it breaks, you probably
needed a new one anyway"

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