The 4 GB VSAM limit can be overcome with extended addressability. Here is the 
definition I used for V2R1 ServerPac, a ZFS that occupied an entire Mod 27. The 
key is data class, which is set in SMS for EA. 

  DEFINE CLUSTER (NAME(hlq.R21WK2.ZFS) -                 
  VOLUMES(R21WKX) SHAREOPTIONS(3) *DATACLAS(EXT)* LINEAR -    
  *CYLINDERS(28000,100)* )                                     

.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler 
SHARE MVS Program Co-Manager
323-715-0595 Mobile
626-302-7535 Office
[email protected]


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of R.S.
Sent: Tuesday, March 22, 2016 5:24 AM
To: [email protected]
Subject: Re: (External):Unix System Services question

W dniu 2016-03-21 o 22:59, Jesse 1 Robinson pisze:
> What I did.
>
> 1. Get into ishell from Opt 6
> 2. Type /usr/local/
> 3. In my case, I apparently have nothing mounted there, so I see only
>         Type  Perm  Changed-PST8PDT   ------Size  Filename
>      _ Dir       755  2013-05-24 22:56        8192  .
>      _ Dir       755  2014-08-01 14:42        8192  ..
> 4. Enter u (for File System Attributes) next to one of them.
> 5. In my case, since I have no other file system defined there, I get the 
> system-specific root OMVS.sysres.ROOT.
>
> If it's root, then you've been using it inadvertently, and changing the size 
> will be a BFD. If you see a subordinate file system there, then that's the 
> one you have to increase. I'm not adept at that this part, but you would 
> create a new bigger one, copy over all contents from the old, unmount the old 
> one, and mount the new one at the same point. Good luck.
>

Another method would be "df" command.
 From unix prompt issue                    "df /your/directory"
or          "cd /your/directory"
and then     "df . "

You'll get filesystem name = ZFS or HFS dataset name.
Then look at dataset parameters. There are many factors which can limit 
growth:
- number of extents
- free space on the volume
- multi-volume
- candidate volumes availability
- 4GB limit for VSAM

-- 
Radoslaw Skorupka
Lodz, Poland


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