Could you explain a little more about the Read/Write errors codes 84, 85,
86. We are getting tons of 85 errors with invalid header hits in the logs.
Are you saying this has to do with the number of data buffers?
Thanks,
Rick
-----Original Message-----
From: Fritz, Todd [DABIS] [mailto:Todd.Fritz AT state.ks DOT us]
Sent: Tuesday, February 20, 2001 8:37 AM
To: 'David A. Chapa'
Cc: 'dcaddell AT intersil DOT com'; 'veritas-bu AT mailman.eng.auburn DOT edu';
'Nbu-Lserv AT Datastaff DOT Com'
Subject: RE: [NBUADV-L]: Performance Tuning
Sensitivity: Confidential
Ok so Ditto applies to what you said David, I can vouch for your
suggestions, as I told Scott we are in the middle of 3 months of testing
/tuning and you are correct(for our environment of sun boxes and DLT7's) One
note, check or create a file in /what ever is correct
/netbackup/NET_BUFFER_SZ while you may not need to change this from 32k
declaring it will let you know what to expect.
Also keep an eye on shared memory settings. Note: on NT
Read/Write Error codes 84, 85 and 86 = Reduce NUMBER_DATA_BUFFERS.
Todd
Todd Fritz
Systems Software
D.I.S.C. Tech Support
State of Kansas
900 SW Jackson, 751 S
Topeka, Kansas 66612-1275
(785) 296-6640
Todd.Fritz AT state.ks DOT us
-----Original Message-----
From: David A. Chapa [mailto:david AT datastaff DOT com]
Sent: Tuesday, February 20, 2001 10:13 AM
To: Caddell, Scott;
Cc:
Subject: RE: [NBUADV-L]: Performance Tuning
Sensitivity: Confidential
Scott:
I've never created the keys, but what I have done (on NT) is to create the
files NUMBER_DATA_BUFFERS and SIZE_DATA_BUFFERS in
/veritas/netbackup/db/config, which works just as well.
As far as guidelines goes, I would first create a bptm log and begin
monitoring the performance of your media servers (these buffer files will
only need to be created on the MEDIA SERVERS).
Based on the information you gleen from there, I would make my changes from
default (8x32 - 8 DATA BUFFERS x 32K ea for non multiplex and 8x64 for
multiplex).
My own experience has been that I have seen increased performance when I
decrease the number of buffers and increase the size, but your mileage may
vary depending on your own environment.
What to look for in the bptm logs?
waited for full buffer
this is the number of times bptm had to wait for a full buffer. This would
indicate less data coming from the network, so adding more buffers will not
help, but perhaps reducing the number of buffers *MIGHT*.
waited for empty buffer
how many times bptm had to wait for the buffer to empty. This would
indicate more data coming from the network than the drive can handle so more
buffers would apply here.
The delayed xxxxx times in the logs message
is the number of time bptm waited in the loop for an available buffer (30ms
delay ea. time)
Hope this helps.
David
<><><><><><><><><><><><><><><><><><><><>
David A. Chapa
Consulting Manager
DataStaff, Inc.
847 413 1144
http://www.consulting.datastaff.com
---------------------------------------
NBU-LSERV AT datastaff DOT com - Adv. Scripting
-----Original Message-----
From: owner-nbu-lserv AT datastaff DOT com
[mailto:owner-nbu-lserv AT datastaff DOT com]On Behalf Of Caddell, Scott
Sent: Tuesday, February 20, 2001 9:44 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Cc: Nbu-Lserv@Datastaff. Com
Subject: [NBUADV-L]: Performance Tuning
Sensitivity: Confidential
I need to do some SCSI performance tuning on my W2K Master (3.4). I am
pretty
sure I need to create some registry keys in HKLM/Software/Veritas/config
called
Number_Data_Buffers and Size_Data_Buffers, but I'm not sure on how I should
set
the values. Does anyone have information on creating these keys and a
guideline
on tuning?
Thanks,
Scott Caddell
Intersil Corporation
Palm Bay, FL
-------------------------------------------------------
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http://www.consulting.datastaff.com/adv_script_site
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http://www.consulting.datastaff.com/adv_script_site
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