Hi there,
first of all sorry for the long append but I need to explain my problem in
detail.
I was trying to optimize our backup performance for a particular node, so I got
a look at
INSTR_CLIENT_DETAIL trace output.
Server is ADSM 3.1.2.50 on OS/390 V2R6
Client is USS 3.1.0.5
Commethod is TCPIP using a CTC (Channel To Channel) connection
Client and Server are on two separate LPAR on the same 2064 machine
Here is our starting point:
Total number of objects inspected: 52,041
Total number of objects backed up: 1,554
Total number of objects updated: 0
Total number of objects rebound: 0
Total number of objects deleted: 72
Total number of objects failed: 0
Total number of bytes transferred: 8.10 GB
Data transfer time: 256.23 sec
Network data transfer rate: 33,168.89 KB/sec
Aggregate data transfer rate: 1,396.01 KB/sec
Objects compressed by: 55%
Elapsed processing time: 01:41:28
and trace output:
Elapsed time: 6088.402 sec
Section Total Time(sec) Average Time(msec) Frequency used
-----------------------------------------------------------------
Client Setup 0.063 62.9 1
Client Setup 0.063 62.9 1
Process Dirs 108.029 47.1 2292
Solve Tree 0.000 0.0 0
Compute 2.003 0.0 768476
Transaction 46.226 0.0 2312991
BeginTxn Verb 0.007 0.0 1181
File I/O 2659.223 4.6 580646
Compression 2964.974 4.3 692721
Data Verb 255.722 1.0 266454
Confirm Verb 0.202 4.9 41
EndTxn Verb 51.560 43.7 1181
Client Cleanup 0.392 392.2 1
So,according to common tuning consideration, I decide to turn client compression
off.
The results weer not as expected:
Total number of objects inspected: 57,067
Total number of objects backed up: 1,450
Total number of objects updated: 0
Total number of objects rebound: 0
Total number of objects deleted: 507
Total number of objects failed: 1
Total number of bytes transferred: 18.53 GB
Data transfer time: 6,941.87 sec
Network data transfer rate: 2,799.28 KB/sec
Aggregate data transfer rate: 1,858.10 KB/sec
Objects compressed by: 0%
Elapsed processing time: 02:54:18
and trace output:
Elapsed time: 10458.494 sec
Section Total Time(sec) Average Time(msec) Frequency used
------------------------------------------------------------------
Client Setup 0.766 765.9 1
Client Setup 0.766 765.9 1
Process Dirs 123.954 47.2 2625
Solve Tree 0.000 0.0 0
Compute 1.975 0.0 608333
Transaction 53.118 0.0 1831471
BeginTxn Verb 0.009 0.0 1179
File I/O 3239.495 5.3 609776
Compression 0.000 0.0 0
Data Verb 6940.654 11.4 608333
Confirm Verb 38.818 825.9 47
EndTxn Verb 59.321 50.3 1179
Client Cleanup 0.385 384.6 1
My question is; why Data Verb is so increased while data to be transferred are
only doubled?
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