This email is to be read subject to the disclaimer below.

I had exactly the same problem when I removed a fibre-SCSI bridge from an 
old library of ours - all tapes the were written with fibre were 128kb and 
the direct attached drives would support a maximum of 64kb (which is 
standard for most SCSI cards on Windows)

You need to edit the registry to enable a larger blocksize. For Adaptec 
based cards this is the fix. I have tested this and it also works for 
HBA's and other SCSI cards as well. Just substitute the device driver name 
in where aic78xx is. 

HKEY_LOCAL_MACHINE
  CurrentControlSet
    Services
      aic78xx
        Parameters
          Device
            MaximumSGList    REG_DWORD:0xFF

Cheers,
Matt
_____________________________________________________________________________________
Matthew Robert | Data Backup & Retention Administrator | Ernst & Young 
Services Pty Limited | Direct: (02) 9248 4784 | Fax: (02) 9248 5316
E-mail: matthew.robert AT au.ey DOT com | Please note our new address: Ernst & 
Young Centre, 680 George Street, Sydney 2000
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"Scalise, Kathleen (NSTS.JAX)" <kathleen_scalise AT ML DOT COM> 
Sent by: Legato NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>
16/05/2006 01:03 AM
Please respond to
Legato NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>; Please 
respond to
"Scalise, Kathleen (NSTS.JAX)" <kathleen_scalise AT ML DOT COM>
All email is logged and may be reviewed - Refer policy FP206

To
NETWORKER AT LISTSERV.TEMPLE DOT EDU
cc

Subject
Re: [Networker] HELP - BRP






Davina:

Our library here is fibre attached and the drive at our BRP site is a
direct connect stand alone.

Kathleen Scalise
Asst. Vice President
Network Services and Technology Support
Merrill Lynch - Jacksonville, Florida
Phone:  904.218.5139
Fax:  904.218.5445
kathleen_scalise AT ml DOT com


-----Original Message-----
From: Davina Treiber [mailto:DavinaTreiber AT PeeVRo.co DOT uk] 
Sent: Monday, May 15, 2006 10:18 AM
To: Legato NetWorker discussion; Scalise, Kathleen (NSTS.JAX)
Subject: Re: [Networker] HELP - BRP


Scalise, Kathleen (NSTS.JAX) wrote:
> The device block size in Networker Admin 'Configuration' tab for the 
> drive is "handler default".  Is there where I set it to 128K??
> 
> In the 'Volume' tape of the device it reflect 128K.  Below the Record 
> size = 131072 bytes = 128K?
> 
> Checking my main backup server that the tape was created on, it is the

> same.
> 

Kathleen,

The "More data is available" error messages definitely indicates a block

size mismatch, telling you that the blocksize of the data on the tape is

larger than you can read on your DR server.

If you have not changed the block size (by setting an environment 
variable on your main server), then NetWorker will be using its 
defaults, so you are looking slightly in the wrong place. The most 
likely explanation is the the hardware at your DR site cannot read data 
written with the NetWorker LTO-3 default blocksize due to a limitation 
of the driver for the HBA. I would guess that the HBA in use at your DR 
site is not the same as your main site, or is perhaps using a different 
driver or different servicepack.

To resolve this you will need to either change the HBA or change the 
driver on your DR site. Another approach is to reduce the block size on 
your main site to match the limitation on your DR site, however this 
does not help you to read this particular tape, and this approach could 
result in a performance degradation.
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