A few things. Last I knew, HMIGRATE didn't have access to ML2, only MIGRATE. 
When the dataset is on primary DASD, the back=up date is kept in the "catalog" 
data (probably the VVDS) and therefore reportable by "catalog" functions 
(IDCAMS LISTCAT). Once migrated, the backup date reported by HLIST is from the 
DFHSM BCDS record.

And I think you are correct, a DS on ML1 can still be backed up, so manual 
migration to ML1 is ok.

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On
> Behalf Of willie bunter
> Sent: Wednesday, November 24, 2010 8:45 AM
> To: IBM-MAIN@bama.ua.edu
> Subject: Re: DFHSM MIGRATE MYSTERY
> 
> Joel,
> 
> I did a manual BACKDS command of the dsn.  Next I did a LISTCAT of the
> dsn and it shows LBACKUP ---2010.328.0643.  I did a HMIG dsn ML2 . I
> did a LISTCAT again and it shows LBACKUP ---XXXX.XXX.XXXX
> However when I do HLIST of the dsn it shows the backup 10/11/24
> 06:43:55
> I am not sure why this is happening.  I also noted that if I issue the
> HMIG dsn ML2 the MANAGEMENT CLASS Migration Attributes is being ignored
> even though I have specified
> the following:
> Primary Days Non-usage  . : 3
> Level 1 Days Date/Days  . : 2
> Command or Auto Migrate . : BOTH
> 
> As an earlier poster had mentioned that if a manual Migrate ML2 command
> is issued to migrate the dsn, it overrides the Migration attributes.
> This storage group is exempt from Auto Migrate but it does have Auto
> Backup turned on.  I noticed that the Auto Backup is working.  The
> dataset in question was not backed up because it was created after the
> Auto Backup had run.
> 
> 
> --- On Tue, 11/23/10, Joel C. Ewing <jcew...@acm.org> wrote:
> 
> 
> From: Joel C. Ewing <jcew...@acm.org>
> Subject: Re: DFHSM MIGRATE MYSTERY
> To: IBM-MAIN@bama.ua.edu
> Received: Tuesday, November 23, 2010, 4:04 PM
> 
> 
> Did you display the LBACKUP date while the file was migrated?  On z/OS
> 1.10 I only see the actual last Backup date displayed if the dataset is
> on a primary volume.  If on ML1 or ML2 neither ISMF no LISTC will
> display the backup date.
> 
> Did you do a
> "HMIG  dsnamefilter"
> (which is a request to migrate to ML1) or
> "HMIG dsnamefilter ML2"?
> 
> If I try to migrate a dsn with an autobackup management class to ML2
> and
> there is no backup yet, it fails with "ARC1280I MIGRATION FAILED - DATA
> SET IS IN NEED OF BACKUP".  If I try to migrate the same dataset to ML1
> ("ML2" parm omitted), migration succeeds.  I think this is because
> DFHSM
> can still do an autobackup from ML1.  Or If I then attempt to force a
> migrate from ML1 to ML2 with "HMIG dsname ML2" before there is a
> backup,
> I also get the ARC1280I failure.
> 
> 
> On 11/22/2010 07:51 AM, willie bunter wrote:
> > Mike,
> >
> > I took your advice and set the MANAGEMENT CLASS AUTO BACKUP=Y.
> >
> > As a test I created a new dsn using the same HLQ's and Management
> Class. I tried the MIGRATE command via batch (using wild cards)   it
> went to ML1 instead of ML2 which was NOT happening before I changed the
> AUTO BACKUP from N to Y.   I did a LISTCAT of the dsn but it  shows
> that no backup was done. Inspite of this the dsn was sent to ML1.  Not
> sure why
> > LBACKUP ---0000.000.0000
> >
> > If I understand Joel's post correctly in which he says that
> "Migration Attributes for primary and level 1 only apply to auto
> migration" then the dsn should not have been sent to ML1 but directly
> to ML2.
> >
> > Any suggestions?
> >
> > --- On Fri, 11/19/10, Mike Schwab<mike.a.sch...@gmail.com>  wrote:
> >
> >
> > From: Mike Schwab<mike.a.sch...@gmail.com>
> > Subject: Re: DFHSM MIGRATE MYSTERY
> > To: IBM-MAIN@bama.ua.edu
> > Received: Friday, November 19, 2010, 10:39 AM
> >
> >
> > You can requre that a successful SMS backup before it allows the
> > dataset to be migrated.
> >
> > On Fri, Nov 19, 2010 at 8:00 AM, willie
> bunter<williebun...@yahoo.com>  wrote:
> > <deleted>
> >> When the batch job is executed all the dsns (these are all VSAM
> dsns) are migrated ML2 - including those that were created this morning
> before the migrate was done.  According to the Migration Attributes
> shouldn't those dsns which were created today&  yesterday not be
> migrated?
> >> Could someone help me understand where else I should look.
> >>
> >> Thanks in advance for your help.
> >
> 
> 
> --
> Joel C. Ewing, Fort Smith, AR        jcew...@acm.org
> 
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> 
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