[Info-vax] Sudden problems with slow sftp transfers and slow disk accesses

[Jim]

On Tuesday, February 18, 2014 6:06:01 PM UTC-5, gwil... at cfa.harvard.edu wrote:
> I have set all the interface cards to auto-negotiate (one machine
> is so old, its interface cards won't accept the /auto qualifier, but
> it hasn't been showing any duplex mismatches).  The SHOW DEV/INT
> command, which I had not previously used, was the key to fixing
> this.


For any VMS system where the NIC can not be set to "auto" to match the switch port setting you'll likely find that you'll want it set to half-duplex - when the switch fails to negotiate the mode it will settle on half duplex. This may not be apparent until the path is under load - if you have a duplex mismatch you should find that the result is numerous frame check and alignment errors observed by the NIC and the resultant retransmissions, etc...