ADSM Performance on SP and 3494
2000-02-11 11:19:52
Hi all,
We are running ADSM 3.1 on a R40 (6 way 200MHz) hi node in an SP2. We are
backup up
a 1TB DB2 EEE database which is running on 24 silver nodes (2 way 332 MHz).
The SP2
is running at AIX 4.3.2 and PSSP 2.4. The ADSM server has a 3494 attached
with 16
3590 B1A tape drives.
Our problem is that, we started out with 6 drives and completed the backup
in 12 hours.
Now that we added 10 drives and 2 additional frames to the 3494, our
backup is actually
taking longer to complete 13-14 hours using 8 drives at a time. The DB2
backups write directly
to tape. I am hoping to complete the backups within 9 hours or less using
up to 12 drives.
I have started playing around with the tuning values in ADSM and AIX, but
have not come up
with the correct combination. So, if anyone has any experience with a
similar setup, any help
is appreciated.
Here are our tuning settings:
SP switch settings on all nodes:
spoolsize/rpoolsize 16777216 (16MB)
AIX
thewall 262144
sb_max 1310720
tcp_sendspace 655360
tcp_recvspace 655360
ADSM Server
MoveBatchSize 1000
MoveSizeThresh 500
TxnGroupMax 256
UseLargeBuffers Yes
TCPBufsize 16384
TCPWindowsize 0
TCPNoDelay Yes
ADSM Client
TCPBuffsize 32
TCPWindowsize 640
txnbyte 25600
tcpnodelay Y
uselargebuffers yes
Thanks for the help. Alex
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