z/OS DFS SMB Performance

Problem:

When connecting to work over VPN, SMB performance leaves a lot to be
desired. Where a 200k file in the office loads in 5-9 seconds, over VPN
it takes 50-60 seconds. It does not appear to be a server problem or a
bandwidth problem. I tried the same file directly pulling it from an
HFS and I got it loaded in 6 seconds from home. I then setup a file
server on a z/OS box to see if it would perform better. It did not.
Talking to local VPN expert, he basically said that SMB is "chatty" and
that we will see some improvement with Windows Vista.





Reading the DFS manual for SMB, there are several notes about
performance one of which states that HEAPPOOLS(ON) provides a
significant improvement. What they don't say is what the heap pool
sizes and percentages should be for SMB. I am overriding the HEAPPOOLS
in the JCL so these will not be system wide. I tried HEAPPOOLS(ON) and
did see a good improvement.



Any help would be appreciated.



Sean Smith

Bank of America


----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html

.

Relevant Pages

  • Re: SMB vs NFS
    ... > More like running programs remotely that write to config/log files in ... I won't be sharing any system logs, which would most certainly be a security ... I agree that SMB on its own is less secure than SSH, ... I've only ever used a VPN using Win2k as a client and server. ...
    (comp.os.linux.networking)
  • RE: z/OS DFS SMB Performance
    ... We are not using z/OS for the VPN ... Subject: z/OS DFS SMB Performance ... Is the VPN terminated outside from z/OS? ... When connecting to work over VPN, SMB performance leaves a lot to be ...
    (bit.listserv.ibm-main)
  • Re: Share folder over internet
    ... You can connect the two offices via a VPN connection from router to router. ... Well, we do not have static IP addresses, and the routers does not support VPN. ... Mount nfs? ... I can mount a remote smb volume then share it with another smb server, but it looks wreid to me and I'm also concerned about speed. ...
    (freebsd-questions)
  • Re: z/OS DFS SMB Performance
    ... From my experience SMB on any platform is slow. ... Now add the overhead of a VPN and the latency and through put of something that is most likely much less than the network between your PC and the mainframe at your work. ... For IBM-MAIN subscribe / signoff / archive access instructions, ...
    (bit.listserv.ibm-main)
  • Re: z/OS SMB Question
    ... We are using SMB with no performance or CPU problems. ... We are using HFS. ... Are any of you zFS or HFS files large with a bunch of small files. ... For IBM-MAIN subscribe / signoff / archive access instructions, ...
    (bit.listserv.ibm-main)