Hi Greg,
with EMC SolutionsEnabler you can check if any Symmetrix devices are
reserved by AIX.

First, I have created and activated the VG 'testvg':
#> lsvg -p testvg
testvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE
DISTRIBUTION
hdiskpower0 active 259 259
52..52..51..52..52
hdiskpower1 active 259 259
52..52..51..52..52


With 'symdev -sid XXX -resv list' you are able to see all reservations
in the Symmetrix:
#> symdev -sid 739 -resv list
Symmetrix ID : 000182504739
Device Name Device Reservation
---------------------------- -------------
----------------------------
Physical Sym Config Initiator SA :P Type
---------------------------- -------------
----------------------------
/dev/rhdiskpower0 0006 RDF1+Mir 00 01A:0 Group
/dev/rhdisk7 0006 RDF1+Mir 00 12A:0 Group
/dev/rhdiskpower1 000E RDF1+Mir 00 01A:0 Group
/dev/rhdisk8 000E RDF1+Mir 00 12A:0 Group


When you varyoff the VG the reservations will be cleared by your node:
#> varyoffvg testvg
#> symdev -sid 739 -resv list
Symmetrix ID : 000182504739
No Symmetrix devices were found to have reservations.

(You can use 'sympd -sid XXX -resv' list to check only the hdisks
visible to the node running that command.)

Best Regards,

Swen


gbeckowski@rohmhaas.com (Gregory Beckowski) wrote in message news:<35e7709.0306191221.74f7108e@posting.google.c om>...
> The thing that caught my attention in your response was the GK info.
>
> We do symmir loops (and sleeps 60+ seconds) to wait for sync'ng and
> splitting disks. And at one point we had no GKs because we were told
> we did not need them. Now we have about 6 GKs per host, not per HBA.
> I never understood why the SYMCLI commands need to clear a
> reservation in order to access their data in the Symm.
>
> We also ran in to the HACMP and LUN reset vs. FA reset issue. We
> never setup those cluster OEM files (until recently) and in the past
> our HACMP detail log shows the SCSI command sent was a LUN reset not a
> BUS reset.
>
> But there is still no way of directly checking the reservation state
> of a disk. All these settings and upgrades and test do not directly
> monitor how the reservations are being managed by the initiator
> (Powerpath/FC driver/HBA) and the target (Symmetrix software).
> Looking at the SCSI spec only seems to show an indirect method, ie,
> try to get the reservation and the return code will tell you if you
> have or some other HBA does.
>
>
>
> Greg
>