[Networker] SV: [Networker] determine block size on a old tape ?

Hello and thanks Matthew,

I found that it had been written in 128 kb block size. I also found an
instruction an how to set ?maximum block size? from 64 kb to 128 kb (add
registry key). 

CHANGING THE BLOCK SIZE:
1. Run REGEDIT (the Registry Editor)
2. open:
\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cpq32fs2 (cpq32fs2
should be replaced with your scsi card name)
 
3. Create a key named Parameters (if it doesn't exist) by selecting from the
menu:
Edit > New > Key and entering Parameters for Key Name.
 
4. Open the Parameters key and create a key named Device by selecting from
the menu:
Edit > New > Key and entering Device for Key Name.
 
5. Open the Device key and create a DWORD named MaximumSGList by selecting
from the menu:
Edit > New > DWORD and entering MaximumSGList for DWORD Name.
 
6. Open the MaximumSGList Value Name and replace the existing Value Data in
Decimal with one of the values from (Table 6)
 
Table 6. Block Sizes
Block Size Decimal Value Hex Value
64k 17 decimal 11 hex
96k 25 decimal 19 hex
128k 33 decimal 21 hex
256k 65 decimal 41 hex
512k 129 decimal 81 hex
 
If your block size is not listed, please use the above formula for the
decimal value:
MaximumSGList = (Maximum Block Size)/4K +1
 
7.  Close regedit and reboot the server.
 

8.  Run the mt command to confirm that the maximum block size has changed.

 

Sample: C:\>mt -f <\\.\Tape1> status

Problem solved :-)

Hans

  _____  

Från: Matthew.Robert AT au.ey DOT com [mailto:Matthew.Robert AT au.ey DOT com] 
Skickat: den 27 augusti 2008 01:36
Till: h.ericson AT morex DOT se
Ämne: Re: [Networker] determine block size on a old tape ?

 

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Gday Hans, 

mount the tape in a drive, right click on the drive properties, under the
"Volume" it will have a field that says "Volume block size" 

The header on the tape is always written in 32KB blocks so they can be read
on anything, inside that header, the actual block size is embedded in there 

Cheers,
Matt 







Hans Ericson <h.ericson AT morex DOT se> 
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26/08/2008 06:14 PM 


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Subject

[Networker] determine block size on a old tape ?

 


 

 




Hello,

Trying to do a scanner on a tape from 2005, I get a "unknown error" 234.
(The tape lable can be read.) Error 234 means "More data is available", and
that is good ;-) I suppose this tape has been written with a different block
size and the current Backupserver is set for something else.... Found that
MS did something in SP1 (w2003).

How can I determine the block size for this tape and how do I set it right?

Win 2003 (currently sp1, but when the tape was written it was without SP)
Networker 7.1.4
SDLT 220

Grateful for any help.
Hans

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