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If I may offer a gentle correction here:
=20
It is not in fact a Windows thing, despite Microsoft KB articles (now
quite old) that suggest it is.=20
It is in fact an implementation constraint for most tape drivers, based
on misunderstandings about the limitations of Windows. Windows does not
have this particular limitation.
Prove it to yourself. Load VERITAS drivers for all tape drives, the
message will go away, and backups and restores will work.
=20
As with all hardware, firmware and buffer changes, you should still test
restores from large backups that span tapes in order to verify that
everything is in order.
_____ =20
Brenton Carbins
Senior Systems Engineer
Symantec Corporation
Email: Brenton_Carbins AT symantec DOT com
=20
=20
_____ =20
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Thomas M.
Riebe
Sent: Wednesday, 12 April 2006 7:19 AM
To: Major, Rusty; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] IBM LTO3 Buffer Sizes
This is Windows OS limitation. The Window's scsi api does not support
above 64K. You can use a 256K SIZE_DATA_BUFFERS in Linux/Unix land.
=20
Thanks,
Thomas Riebe
Ivy Tech Community College
_____ =20
From: veritas-bu-admin AT mailman.eng.auburn DOT edu on behalf of Major, Rusty
Sent: Tue 4/11/2006 5:37 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] IBM LTO3 Buffer Sizes
I've setup a new environment with IBM LTO3 drives. I set
SIZE_DATA_BUFFERS to 256K, but got an error in the details stating the
drive only supported 64K and the job would not run. Sure enough,
changing it back to 64K allowed the job to run as normal. Others have
said that 256K is supported on LTO3, but I'm not sure what hardware or
OS that is on. Is this an IBM drive thing, a Windows thing, or what? I
would appreciate any ideas.
=20
Windows 2003 Master
NBU 6.0MP2
IBM LTO3
=20
Thanks,
=20
Rusty Major, MCSE, BCFP
Data Assurance Engineer
(281) 584-4693
VeriCenter, Inc.
=20
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charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2900.2802" name=3DGENERATOR></HEAD>
<BODY>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>If I may offer a gentle correction=20
here:</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>It is not in fact a Windows thing, despite =
Microsoft KB=20
articles (now quite old) that suggest it is. </FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>It is in fact an implementation constraint for =
most tape=20
drivers, based on misunderstandings about the limitations of=20
Windows. Windows does not have this particular=20
limitation.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Prove it to yourself. Load VERITAS drivers for =
all tape=20
drives, the message will go away, and backups and restores will=20
work.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D437365207-12042006><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>As with all hardware, firmware and buffer =
changes, you=20
should still test restores from large backups that span tapes in order =
to verify=20
that everything is in order.</FONT></SPAN></DIV><FONT color=3D#000000=20
size=3D2></FONT><FONT color=3D#000000 size=3D2></FONT><FONT =
color=3D#000000=20
size=3D2></FONT><FONT color=3D#000000 size=3D2></FONT>
<DIV style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif"=20
align=3Dleft><FONT color=3D#000000 size=3D2></FONT><FONT color=3D#000000 =
size=3D2></FONT><BR></DIV>
<DIV style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif">
<HR align=3Dcenter width=3D* color=3D#000000 noShade>
</DIV>
<DIV=20
style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif"><FONT=20
color=3D#0000ff size=3D2></FONT><BR><BR></DIV>
<DIV=20
style=3D"FONT-SIZE: 10pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif"><B>Brenton=20
Carbins</B></DIV>
<DIV=20
style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif">Senior=20
Systems Engineer</DIV>
<DIV=20
style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif">Symantec=20
Corporation</DIV>
<DIV=20
style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif"><B>Email: Brenton_Carbins AT symantec DOT
com</B>=
</DIV>
<DIV=20
style=3D"FONT-SIZE: 9pt; COLOR: #333; FONT-FAMILY: =
arial,verdana,sans-serif"><IMG=20
height=3D40 alt=3D"Symantec Logo" src=3D"cid:437365207@12042006-188D" =
width=3D130=20
border=3D0></DIV><BR><BR>
<DIV> </DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> =
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of =
</B>Thomas M.=20
Riebe<BR><B>Sent:</B> Wednesday, 12 April 2006 7:19 AM<BR><B>To:</B> =
Major,=20
Rusty; veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> RE: =
[Veritas-bu] IBM=20
LTO3 Buffer Sizes<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV id=3DidOWAReplyText7534 dir=3Dltr>
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 size=3D2>This =
is Windows OS=20
limitation. The Window's scsi api does not support above =
64K. =20
You can use a 256K SIZE_DATA_BUFFERS in Linux/Unix =
land.</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Thanks,</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Thomas Riebe</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Ivy Tech Community=20
College</FONT></DIV></DIV>
<DIV dir=3Dltr><BR>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> =
veritas-bu-admin AT mailman.eng.auburn DOT edu on=20
behalf of Major, Rusty<BR><B>Sent:</B> Tue 4/11/2006 5:37 =
PM<BR><B>To:</B>=20
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> [Veritas-bu] IBM =
LTO3=20
Buffer Sizes<BR></FONT><BR></DIV>
<DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial size=3D2>I've =
setup a new=20
environment with IBM LTO3 drives. I set SIZE_DATA_BUFFERS to 256K, but =
got an=20
error in the details stating the drive only supported 64K and the job =
would not=20
run. Sure enough, changing it back to 64K allowed the job to run as =
normal.=20
Others have said that 256K is supported on LTO3, but I'm not sure what =
hardware=20
or OS that is on. Is this an IBM drive thing, a Windows thing, or what? =
I would=20
appreciate any ideas.</FONT></SPAN></DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial =
size=3D2>Windows 2003=20
Master</FONT></SPAN></DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial size=3D2>NBU=20
6.0MP2</FONT></SPAN></DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial size=3D2>IBM=20
LTO3</FONT></SPAN></DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D314113121-11042006><FONT face=3DArial=20
size=3D2>Thanks,</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV align=3Dleft>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D194261715-04042005><FONT =
face=3DArial=20
size=3D2><STRONG>Rusty Major, MCSE, BCFP</STRONG></FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D194261715-04042005><FONT =
face=3DArial=20
size=3D2><EM>Data Assurance Engineer</EM></FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D194261715-04042005><FONT =
face=3DArial=20
size=3D2>(281) 584-4693</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN =
class=3D194261715-04042005><STRONG><FONT=20
size=3D2><FONT face=3DArial><FONT color=3D#008000>Veri</FONT><FONT=20
color=3D#808080>Center, =
Inc.</FONT></FONT></FONT></STRONG></SPAN></DIV></DIV>
<DIV> </DIV></DIV></BODY></HTML>
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