Should be able to do this anytime. I would pick a low-activity period
just in case.
IGDSMS00 points to the SCDS/ACDS/COMMDS that will be used at the next
IPL. 
If IGDSMS00 is not updated to match the current dataset usage, there may
be issues at the next IPL.

HTH,

<snip>
thx for your replies, this situation happens on a single image, so,
according to your replies I think I can do it as follows:
a) define a new ACDS:
  //STEP  EXEC PGM=IDCAMS
  //SYSUDUMP DD SYSOUT=*
  //SYSPRINT DD SYSOUT=*
  //SYSIN    DD *
    DEFINE CLUSTER(NAME(SMS.DESV.ACDS) -
           LINEAR -
           VOL(*) -
           CYL(75) SHAREOPTIONS(2,3)) -
           DATA(NAME(SMS.DESV.ACDS.D) REUSE)
b) SETSMS SAVEACDS(SMS.DESV.ACDS)
c) SETSMS ACDS(SMS.DESV.ACDS)

PARMLIB/IGDSMS00 defs are ok. No need to change them.

Is this disruptive ?? I never did such a thing. What happens to active
jobs ?? Is it better to this out of busy period??
</snip>

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