[Veritas-bu] Tuning NetBackup, 174 Errors

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Environment:  6 SAN attached SSO servers (5 media, 1 dedicated master) all
running Windows 2000.  Backing up over SAN through MDR to a Compaq 9326 tape
library, 16 DLT8000 drives.  Running NBU Datacenter 3.4.1.

I had been working with Veritas to tune my NetBackup environment using
NUMBER_DATA_BUFFERS and SIZE_DATA_BUFFERS files.  My tests included backing
up about 1.5 GB of data several times to get a baseline of about 4200
KB/sec.  I was able to get that number up to 5600 KB/sec by using 256 as my
"number" and 524288 as my "size".  Based upon my testing, I decided to copy
these tuning files to 2 of my media servers on Friday but received multiple
errors:

"Write of 524288 bytes indicated, only 393216 bytes were written"

There were subsequent error messages with 393217, 262144, 131072 as
subsequent bytes written.  Following these messages I get a status 174, then
a final "Cannot read from media socket 520".

It appears that I will only be able to use 131072 as my maximum data buffer
size.  None of my testing ever yielded a 174 error message and I hate to
keep getting them on live backups.

Any thoughts/input would be appreciated...  

John Glancey
jglancey AT cntus.jnj DOT com


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<P><FONT SIZE=3D2 FACE=3D"Arial">Environment:&nbsp; 6 SAN attached SSO =
servers (5 media, 1 dedicated master) all running Windows 2000.&nbsp; =
Backing up over SAN through MDR to a Compaq 9326 tape library, 16 =
DLT8000 drives.&nbsp; Running NBU Datacenter 3.4.1.</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">I had been working with Veritas to =
tune my NetBackup environment using NUMBER_DATA_BUFFERS and =
SIZE_DATA_BUFFERS files.&nbsp; My tests included backing up about 1.5 =
GB of data several times to get a baseline of about 4200 KB/sec.&nbsp; =
I was able to get that number up to 5600 KB/sec by using 256 as my =
&quot;number&quot; and 524288 as my &quot;size&quot;.&nbsp; Based upon =
my testing, I decided to copy these tuning files to 2 of my media =
servers on Friday but received multiple errors:</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">&quot;Write of 524288 bytes indicated, =
only 393216 bytes were written&quot;</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">There were subsequent error messages =
with 393217, 262144, 131072 as subsequent bytes written.&nbsp; =
Following these messages I get a status 174, then a final &quot;Cannot =
read from media socket 520&quot;.</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">It appears that I will only be able to =
use 131072 as my maximum data buffer size.&nbsp; None of my testing =
ever yielded a 174 error message and I hate to keep getting them on =
live backups.</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Any thoughts/input would be =
appreciated...&nbsp; </FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">John Glancey</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">jglancey AT cntus.jnj DOT com</FONT>
</P>

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