On Tue, 6 Dec 2016 16:46:04 -0600, Paul Gilmartin  wrote:
>On Tue, 6 Dec 2016 15:15:54 -0600, Kirk Wolf  wrote:
>
>>As many are aware, z/OS Comm Svr FTP uses DISP=SHR + ISPF compatible ENQs
>>when writing PDS members.
>>
>Anyone for an RFE for /bin/cp  to do likewise?
>    ...
>LM services LMPUT requires an exclusive ENQ on DSN.  LM, like BPAM,
>may not know the member name until STOW.
>
>>What would happen if the FTP transfer started, this data set ENQ was
>>obtained, and then the transfer hung for some period of time?    Wouldn't
>>that be bad?   Or, perhaps FTP buffers the data for a PDS member write in
>>memory until it has the complete member before doing I/O?
>>
>Solaris FTP allows a pipe as input, so one of us could try throttling FTP PUT.
>
Done.  While the transfer is in progress, DDLIST shows me:
    a red   ENQ on SPFEDIT DSN MEMBER
    a green ENQ on SYSDSN  DSN

I believe directory integrity is protected by a totally separate ENQ.

-- gil

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