Usually, if you Hardware is capable of reading the 256K block size, Legato
will still be able to read the tape, regardless of what the default block
size or NSR_DEV_BLOCK_SIZE is set to.  It sounds like your HBA is
configured for a maximum of 128K block size.  Is this the same hardware on
which the DLT tapes were originally written?

If the SDLT is SCSI attached, and depending on the type of Adapter, you MAY
be able to use the following procedure (from lister Itzik) to modify the
maximum block size.  **NOTE** that once you do this, you will probably want
to set the NSR_DEV_BLOCK_SIZE_SDLT=128 environment variable in your system
settings, otherwise it may start trying to use the 256K block size with
your SDLT tapes, which could cause problems mounting and recovering.
Labelling a new tape and checking its block size from the Devices resource
(or scanner) is the easiest way to test this.

HTH

======================
To change the maximum block size in NT/Win2K environments from the default
64k follow the following procedure.
1. Find out your adapter card type (from Control Panel/SCSI) the tapes are
connected to.
2. Backup your registry.
3. Open the registry for editing.
4. Goto \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AdapterType
5. Create a key named Parameters by selecting Add Key from the Edit menu
and entering Parameters for Key Name. Leave Class blank.
6. Open the Parameters key and create a key named Device by selecting Add
Key from the Edit menu. Enter Device for Key Name. Leave
Class blank.
7. Open the Device key and select Add Value from the Edit menu. In the
Value Name edit-box, enter MaximumSGList. Select REG_DWORD as
the type. For Value, enter a value of 0x41(hexadecimal). This will allow
for block sizes up to 256k.
8. Reboot your system for the new values to take place.
=======================


On Thu, 20 Mar 2003 11:35:26 -0500, Paul Crossman <pcrossma AT WILDFIRE DOT COM>
wrote:

>I'm trying to rebuild media and client indexes from 3 DLT tapes from my
>previous backup silo.
>
>The SDLT tapes write at 128k block size
>The DLT tapes wrote at 256k block size
>
>The backup server is Windows 2000 running Networker 6.2.
>
>When I run scanner -m \\.\Tape0, I get a tape read errors after the
>volume label is read, and I've got an empty volume listed in my volume
>database.
>

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