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I gleaned the following from
ftp://ftp.compaq.com/pub/products/storageworks/whitepapers/Exchange_P=
erforma
nce_Ultrium_460_F.pdf
Its has some good Exchange information as well as
MaximumSGList is the parameter within the Windows registry that contr=
ols the
maximum amount of data transferred in a single SCSI write through the=
Host
Bus Adapter (HBA). Normally, it is set to 64K because HP StorageWorks
Ultrium 460 is so fast it is expedient to increase this value. Refere=
ncing
figure 11, the larger the MaximumSGList parameter is, the more data b=
uffers
are available to queue data for SCSI transfers. This in turn allows t=
he SCSI
controller to incorporate more data writes or =93Packets=94 within on=
e SCSI
write.
To set the size of the Scatter gather list, a DWORD called MaximumSGL=
ist
must be added under the parameters section of the SCSI adapter that t=
he tape
drive is connected to, and given the Hex value of FF, for example. To=
add
the DWORD, go access My Computer > HKEY_LOCAL_MACHINE > System > Curr=
ent
Control Set > Services > Adpu 160m (or relevant SCSI driver) > Parame=
ters >
DWORD FF.
It also mentions that 64 buffers of 64K is optimum for Netbackup 4.5 =
and the
LTO Ultrum 460 (LTO-2)
I found this in the Netbackup Tuning Guide for Windows at
support.veritas.com
http://ftp.support.veritas.com/pub/support/products/NetBackup_DataCen=
ter/248
373.pdf
Lots of good info in here.
Network Buffersize
For backup jobs: (<data_buffer_size> * 4) + 1024
For restore jobs: (<data_buffer_size> * 2) + 1024
Because the default value for the NetBackup data buffer size is 65536=
bytes,
this formula results in a default value of 263168 bytes for backups a=
nd
132096 bytes for restores.
To set this parameter, create the following files:
<install_path>\NetBackup\NET_BUFFER_SZ
<install_path>\NetBackup\NET_BUFFER_SZ_REST (new in 4.5, not used in =
earlier
releases)
NetBackup Client Communications Buffer Size. The NetBackup client has=
a
tunable
parameter that you can use to adjust the size of the Winsock2 network
communications buffer used to write data to the network for backups. =
This
parameter
specifies the value that is used to call the setsockopt() Winsock2 AP=
I to
set the
network buffer size for backups (SO_SNDBUF).
This parameter is the counterpart on the client to the Network Buffer=
Size
parameter
on the media server, described above. As mentioned, the network buffe=
r sizes
are not
required to be the same on all of your NetBackup systems for NetBacku=
p to
function
properly. However, setting the Network Buffer Size parameter on the m=
edia
server
(see above) and the Communications Buffer Size parameter on the clien=
t to
the same
value achieves the best performance in some NetBackup installations.
To set the Communications Buffer Size parameter
1. From Host Properties in the NetBackup Administration Console in re=
lease
4.5, or
=66rom the Configure NetBackup GUI in earlier releases, open the Clie=
nt
Properties
dialog for the client on which the parameter is to be changed.
2. From the Windows Client tab, set the Communications buffer size: f=
ield.
This parameter is specified in number of kilobytes. The default value=
is 32.
An extra
kilobyte is added internally for backup operations (SO_SNDBUF). There=
fore,
the
default network buffer size for backups is 33792 bytes. In some NetBa=
ckup
installations, this default value is too small. Increasing the value =
to 128
improves
performance in these installations.
Another way to set this parameter is to configure the Buffer_Size par=
ameter
in the
registry.
Locate the following key under HKEY_LOCAL_MACHINE
Software/VERITAS/NetBackup/CurrentVersion/Config
Add or modify the Buffer_Size value, which is a REG_DWORD value. Set =
it to
0x20.
Because local backup jobs on the media server do not send data over t=
he
network, this
parameter has no effect on these local operations. This parameter is =
used by
only the
NetBackup client processes which write to the network, specifically, =
the
bpbkar32
process. It is not used by any other NetBackup for Windows processes =
on a
master server,
media server, or client.
By default, NetBackup uses 64 KB (65536 bytes) as the size of each sh=
ared
data buffer.
A single tape I/O operation is performed for each shared data buffer.
Therefore, this
size must not exceed the maximum block size for the tape device or op=
erating
system.
For Windows systems, the maximum block size is generally 64 KB, altho=
ugh in
some
cases customers are using a larger value successfully.
For this reason, the terms =91tape block size=92 and =91shared data b=
uffer size=92
are
synonymous in this context.
The NetBackup media server will query the tape device for its maximum=
block
size,
and cause the backup operation to fail if the shared data buffer size
exceeds the value
that is returned.
Gigabit Ethernet Tuning on Windows
http://ftp.support.veritas.com/pub/support/products/NetBackup_DataCen=
ter/241
544.pdf
Performance Tuning for Unix 3.2/3.4
http://ftp.support.veritas.com/pub/support/products/NetBackup_DataCen=
ter/240
733.pdf
Jim Horalek 1735 Spruce St. Suite C
Federal Edge Riverside, CA 92507
909.683.5024 Fax: 909.683.5025
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<HTML><HEAD>
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D919075921-10032003>I =
gleaned the=20
following from</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D919075921-10032003><A=20
href=3D"ftp://ftp.compaq.com/pub/products/storageworks/whitepapers/Exchan=
ge_Performance_Ultrium_460_F.pdf">ftp://ftp.compaq.com/pub/products/stora=
geworks/whitepapers/Exchange_Performance_Ultrium_460_F.pdf</A></SPAN></FO=
NT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D919075921-10032003>Its =
has some good=20
Exchange information as well as </SPAN></FONT></DIV><FONT face=3DArial =
size=3D2>
<DIV><BR>MaximumSGList is the parameter within the Windows registry that =
controls the maximum amount of data transferred in a single SCSI write =
through=20
the Host Bus Adapter (HBA). Normally, it is set to 64K because HP =
StorageWorks=20
Ultrium 460 is so fast it is expedient to increase this value. =
Referencing=20
figure 11, the larger the MaximumSGList parameter is, the more data =
buffers are=20
available to queue data for SCSI transfers. This in turn allows the SCSI =
controller to incorporate more data writes or =93Packets=94 within one =
SCSI=20
write.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>To set the size of the Scatter gather =
list, a DWORD=20
called MaximumSGList must be added under the parameters section of the =
SCSI=20
adapter that the tape drive is connected to, and given the Hex value of =
FF, for=20
example. To add the DWORD, go access My Computer > HKEY_LOCAL_MACHINE =
>=20
System > Current Control Set > Services > Adpu 160m (or =
relevant SCSI=20
driver) > Parameters > DWORD FF.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><SPAN class=3D919075921-10032003><FONT face=3DArial size=3D2>It =
also mentions=20
that 64 buffers of 64K is optimum for Netbackup 4.5 and the LTO Ultrum =
460=20
(LTO-2)</FONT></SPAN></DIV>
<DIV><SPAN class=3D919075921-10032003><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D919075921-10032003><FONT face=3DArial size=3D2>I =
found this in the=20
Netbackup Tuning Guide for Windows at =
support.veritas.com</FONT></SPAN></DIV>
<DIV><SPAN class=3D919075921-10032003><FONT face=3DArial size=3D2><A=20
href=3D"http://ftp.support.veritas.com/pub/support/products/NetBackup_Dat=
aCenter/248373.pdf">http://ftp.support.veritas.com/pub/support/products/N=
etBackup_DataCenter/248373.pdf</A></FONT></SPAN></DIV>
<DIV><SPAN class=3D919075921-10032003><FONT face=3DArial =
size=3D2>Network=20
Buffersize</FONT></SPAN><SPAN class=3D919075921-10032003></DIV>
<DIV align=3Dleft><FONT size=3D2><FONT face=3DArial>For backup jobs:=20
(<</FONT><I><FONT face=3DArial>data_buffer_size</FONT></I><FONT =
face=3DArial>>=20
* 4) + 1024</FONT></FONT></DIV>
<DIV align=3Dleft><FONT size=3D2><FONT face=3DArial>For restore jobs:=20
(<</FONT><I><FONT face=3DArial>data_buffer_size</FONT></I><FONT =
face=3DArial>>=20
* 2) + 1024</FONT></FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial><FONT size=3D2>Because the default =
value for the=20
NetBackup data buffer size is 65536 bytes, </FONT></FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial><FONT size=3D2>this<SPAN=20
class=3D919075921-10032003> </SPAN></FONT></FONT><FONT face=3DArial =
size=3D2>formula=20
results in a default value of 263168 bytes for backups and 132096 bytes=20
for</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>restores.</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>To set this parameter, =
create the=20
following files:</FONT></DIV>
<DIV align=3Dleft><FONT size=3D2><FONT =
face=3DArial><install_path></FONT><FONT=20
face=3DArial>\NetBackup\NET_BUFFER_SZ</FONT></FONT></DIV>
<DIV align=3Dleft><FONT size=3D2><FONT =
face=3DArial><install_path></FONT><FONT=20
face=3DArial>\NetBackup\NET_BUFFER_SZ_REST </FONT></FONT><FONT=20
face=3D"Times New Roman"><FONT face=3DArial><FONT size=3D2>(new in 4.5, =
not used in=20
earlier<SPAN class=3D919075921-10032003> </SPAN></FONT></FONT><FONT =
face=3DArial=20
size=3D2>releases)</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV align=3Dleft><FONT size=3D2><FONT size=3D2><SPAN =
class=3D919075921-10032003><FONT=20
size=3D1></FONT> </DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>From the =
Windows <SPAN=20
class=3D919075921-10032003>Host properties </SPAN>Client tab, set the=20
<B>Communications buffer size: </B>field.</FONT></DIV></FONT>
<DIV align=3Dleft><FONT face=3DArial></FONT> </DIV>
<DIV align=3Dleft><SPAN class=3D919075921-10032003><FONT =
face=3DArial>Gigabit Ethernet=20
Tuning on Windows</FONT></SPAN></DIV>
<DIV align=3Dleft><SPAN class=3D919075921-10032003><FONT face=3DArial><A =
href=3D"http://ftp.support.veritas.com/pub/support/products/NetBackup_Dat=
aCenter/241544.pdf">http://ftp.support.veritas.com/pub/support/products/N=
etBackup_DataCenter/241544.pdf</A></FONT></SPAN></DIV>
<DIV align=3Dleft><FONT face=3DArial></FONT> </DIV>
<DIV align=3Dleft></SPAN></FONT></FONT><FONT face=3DArial size=3D2><SPAN =
class=3D919075921-10032003>Performance Tuning for Unix=20
3.2/3.4</SPAN></FONT></SPAN></DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"http://ftp.support.veritas.com/pub/support/products/NetBackup_Dat=
aCenter/240733.pdf">http://ftp.support.veritas.com/pub/support/products/N=
etBackup_DataCenter/240733.pdf</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV align=3Dleft>Jim=20
Horalek =
&=
nbsp; 1735=20
Spruce St. Suite C</DIV>
<DIV>Federal=20
Edge &nb=
sp; &nbs=
p; =20
Riverside, CA=20
92507<BR>909.683.5024 &nbs=
p;  =
; =20
Fax: 909.683.5025<BR></DIV>
<DIV> </DIV></BODY></HTML>
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