In looking at many cases like this, it was NEVER the network or TCPIP,
but something else on z/VM, sometimes Escon channels, sometime device
contention, sometimes cache in the storage controller, sometimes CPU
contention. I would recommend a good z/VM performance monitor....
Salecky, Zenko J wrote:
I have copied netstat pool output from both the client and server side.
The valus pretty much stay the same throughout the file transfer time. I
also looked at the TCPIP console and di not see any messages relating to
buffer shortages.
ftp Server side
netstat pool
VM TCP/IP Netstat Level 540 TCP/IP Server Name: TCPIP
TCPIP Free pool status:
Object No. alloc No. free Lo-water Permit size
====== ========= ======== ======== ===========
ACB 1024 1016 1009 102
CCB 154 143 140 15
Dat buf 160 148 146 16
Sm dat buf 12 10 7 1
Tiny dat buf 10 10 9 1
Env 750 750 742 75
Lrg env 50 49 42 5
RCB 51 51 51 5
SCB 264 257 257 26
SKCB 256 256 254 25
TCB 256 251 251 25
UCB 102 102 100 10
Add Xlate 1513 1508 1502 5
NCB 1501 1501 1501 5
IP Route 609 607 607 6
IPv6 Route 605 605 605 6
Segment ACK 5120 5120 5112 512
FPSP total locked pages: 334, Unused locked pages: 55
FPSP allocation threshold: 23984, Low-water mark: 0
TCPIP machine size: 128M, Pools: 5013K, Avail: 105040K, Max block: 85584K
Ready; T=0.01/0.01 08:38:33
ftp client side
netstat pool
VM TCP/IP Netstat Level 540 TCP/IP Server Name: TCPIP
TCPIP Free pool status:
Object No. alloc No. free Lo-water Permit size
====== ========= ======== ======== ===========
ACB 1024 1016 1003 102
CCB 154 136 125 15
Dat buf 160 154 146 16
Sm dat buf 12 9 7 1
Tiny dat buf 10 9 1 1
Env 750 750 741 75
Lrg env 50 49 42 5
RCB 51 51 43 5
SCB 264 256 248 26
SKCB 256 255 245 25
TCB 256 249 240 25
UCB 102 102 92 10
Add Xlate 1513 1508 1508 5
NCB 1501 1501 1501 5
IP Route 609 607 607 6
IPv6 Route 605 605 605 6
Segment ACK 5120 5120 5112 512
FPSP total locked pages: 344, Unused locked pages: 65
FPSP allocation threshold: 2220, Low-water mark: 0
TCPIP machine size: 32M, Pools: 5013K, Avail: 8304K, Max block: 8296K
Ready; T=0.01/0.01 08:42:32
and transfer is still very slow
10639661 bytes
transferred.
10796013 bytes
transferred.
10952702 bytes
transferred.
250 Transfer completed
successfully.
11030147 bytes transferred in 655.865 seconds. Transfer rate 16.82
Kbytes/sec.
Command:
If I transfer from same FTP client to a z/OS FTP Server transfer takes
about 9 seconds.
-Zenko
