The setup on one of our ADSM servers is much like yours: AIX 4.2.1,
ADSM 3.1.2.40, 8-way R50, 3494 library and 7 3590B1E drives. We move about
1TB directly to tape in a 16hr window.

        We too had the problem that when we attached 1 more 3590 drive onto
the ADSM server, the overall performance became very poor. After tuning all
the parameters we could in the OS and ADSM server settings, we couldn't
figure it out. Finally, we installed the latest set of patches for
bos.net.tcp.client and bos.rte.tty (and all the prereqs), and we can now add
the additional tape drive and get better performance.

        You have a different level of AIX on your box, but you might want to
look and see if there are later versions of these filesets.

Ben

> -----Original Message-----
> From: Alexander Liu [mailto:aliu AT CORPNOTES01.MW-CORP DOT COM]
> Sent: Friday, February 11, 2000 9:20 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: ADSM Performance on SP and 3494
>
>
> 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
>