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Simrat,
=20
I've seen many discussions in this forum about using 262144 for a buffer =
sizes on Windows, and most of those discussions talk about it not being =
recommend or successful based on Windows TCP/IP Stack size limitation. =
Others have indicated they have been able to get buffers sizes like this =
to work if your able "tweek" SCSI card parameters or registry settings as =
you've mentioned.
=20
Based on your error message, I'd say the registry may have changed, but =
again, your fighting a fixed block size between the device and OS IP Stack =
communications that changes it back to 64K.
=20
I've also read here that there is a unsupported Windows OS parameter =
change that can be made as well, but again, I don't recall from anyone in =
this forum indicating they've been able to make it work successfully.
=20
I abandoned my effort two years ago to get this to work and now use Linux =
Media and Master servers to resolve this issue.
=20
Scott
>>> "Sekhon Simrat S." <SSSekhon AT VASC DOT com> 4/5/2006 11:20 am >>>
Hello,
=20
We are using Netbackup 6.0 MP1 on Win2k3 STD with HP MSL 6030 tape library =
housing two Ultrium 3 LTO 960 drives. Any idea on how can we change the =
block size from 64Kb to 256 Kb on the tape drive? We=92ve change the =
buffer size in Netbackup and it seems to be writing at 256kb but throws an =
error=20
=20
=93The tape device at index -1 has a maximum block size of 65536 bytes; a =
buffer size of 262144 cannot be used=94
=20
HP support pointed this to the SCSI adapter. I=92m using LSI PCI-X Ultra =
320 SCSI adapter with the latest driver. According to LSI, there is a =
registry change that needs to be done to overcome the Windows limitation =
of 64kb buffer size. This was changed to 256kb as per LSI requirements =
and I=92m still getting the above error. It seems like the drive just =
can=92t write more than 64k. Any ideas how can this be changed to 256?
=20
Thanks in advance.
=20
Simrat
=20
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<DIV>Simrat,</DIV>
<DIV> </DIV>
<DIV>I've seen many discussions in this forum about using 262144 for a =
buffer sizes on Windows, and most of those discussions talk about it =
not being recommend or successful based on Windows TCP/IP Stack size =
limitation. Others have indicated they have been able to get buf=
fers sizes like this to work if your able "tweek" SCSI card =
parameters or registry settings as you've mentioned.</DIV>
<DIV> </DIV>
<DIV>Based on your error message, I'd say the registry may have changed, =
but again, your fighting a fixed block size between the device =
and OS IP Stack communications that changes it back to 64K.</DIV>=
<DIV> </DIV>
<DIV>I've also read here that there is a unsupported Windows OS parameter =
change that can be made as well, but again, I don't recall from anyone in =
this forum indicating they've been able to make it work =
successfully.</DIV>
<DIV> </DIV>
<DIV>I abandoned my effort two years ago to get this to work and now =
use Linux Media and Master servers to resolve this issue.</DIV>
<DIV> </DIV>
<DIV>Scott<BR><BR>>>> "Sekhon Simrat S." <SSSekhon AT VASC DOT
com>=
4/5/2006 11:20 am >>><BR></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial">Hello,<?xml:namespace prefix =3D o ns =3D =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial">We are using Netbackup 6.0 MP1 on Win2k3 STD =
with HP MSL 6030 tape library housing two Ultrium 3 LTO 960 drives. Any =
idea on how can we change the block size from 64Kb to 256 Kb on the tape =
drive? We've change the buffer size in Netbackup and it seems to be =
writing at 256kb but throws an error <o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial">"The tape device at index -1 has a maximum block =
size of 65536 bytes; a buffer size of 262144 cannot be used"<o:p></o:p></SP=
AN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial">HP support pointed this to the SCSI adapter. I'm =
using LSI PCI-X Ultra 320 SCSI adapter with the latest driver. According =
to LSI, there is a registry change that needs to be done to overcome the =
Windows limitation of 64kb buffer size. This was changed to 256kb as =
per LSI requirements and I'm still getting the above error. It seems like =
the drive just can't write more than 64k. Any ideas how can this be =
changed to 256?<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial">Thanks in advance.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: Arial">Simrat<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =
style=3D"FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV><BR>
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