We are running ADSM V2.1 on an IBM SP2 across the high speed switch to a
pair of 3490 tape drives attached to one of the nodes.  We are primarily
concerned with backing up Oracle Databases, so some of the files are rather
large.  We have changed the network options according to recommendations
found on the SP home page.  They now look like this:

                dog_ticks = 60
                 lowclust = 200
                  lowmbuf = 500
                  thewall = 6000
              mb_cl_hiwat = 1200
                compat_43 = 1
                   sb_max = 1310720
             detach_route = 1
          subnetsarelocal = 1
                   maxttl = 255
                ipfragttl = 60
          ipsendredirects = 1
             ipforwarding = 1
                  udp_ttl = 30
                  tcp_ttl = 60
               arpt_killc = 20
            tcp_sendspace = 65536
            tcp_recvspace = 65536
            udp_sendspace = 65536
            udp_recvspace = 65536
           loop_check_sum = 1
           rfc1122addrchk = 0
           nonlocsrcroute = 1
            tcp_keepintvl = 150
             tcp_keepidle = 14400
             tcp_keepinit = 150
          icmpaddressmask = 0
                  rfc1323 = 1
                ipqmaxlen = 50
              tcp_mssdflt = 512
       directed_broadcast = 0

The dsm.opt file is:

nodename         switch05
subdir           yes
LANGUAGE         AMENG
NUMBERFormat     1
REPLACE          ON
TAPEPROMPT       NO
TIMEFORMAT       1

The dsm.sys file is:

SErvername     switch01
COMMmethod     TCPip
TCPPort        1500
TCPServeraddress 198.113.200.129
TCPBuffsize     24
TCPWindowsize   256
TCPNODELAY      YES
TXNBYTE         25600
COMPression     OFF

The dsmserv.opt file is:

   COMMmethod           TCPIP
   TCPPort              1500
   MAXSessions          20
   LANGuage             AMENG
   DATEformat           1
   TIMEformat           1
   NUMberformat         1
   MIRRORREAD           LOG NORMAL
   MIRRORREAD           DB  NORMAL
   MIRRORWRITE          LOG PARALLEL
   txngroupmax          256
   TCPWindowsize        256
   TCPBuffsize          32
   txnbyte              25600
   tcpnodelay           Y
   devconfig            devconfig.back
   volumehistory        volumehistory.out

A recent backup of one of the Oracle databases yielded:

Files Backed Up:        13,815
Bytes Transferred:      2,552,244 KB
Transfer rate           553.635 KB/sec

This transfer rate is much lower than it should be across a high speed
switch.  Are there any other tuning recommendations available?  Suggestions
or information would be most welcome.

Russ Brooks