LUN migrate for AIX

Did you try a "cfgmgr" and then "lsdev" ? I think it should work.

If not, do you use PowerPath ? Then you could try to do a "rmdev" on a hdisk (the hdiskpower would still be available), then a "cfgmgr" and "lsdev". If it is succesful, do this on the other paths of the hdiskpower.

Hi,

I have tried following task:

1. umomnt /fs
2. varyoffvg myvg
3. exportvg myvg
4. powermt remove dev=hdiskpowerx
5. rmdev dl hdiskx
6. CARiiON LUN migrate
7. emc_cfgmgr.sh
8. importvg -y myvg hdiskpowerx
9. varyonvg myvg
10. mount /fs
11. lsdev -Cc disk

The disk showed RAID 5 again.

Best Regards,
Dennis

Hi Ovivier,

I create new RAID1/0 LUN and do LUN migrate directly from R5 to R1/0.
This is CLARiiON data migrate function.

Best Regards,
Dennis Dai

If you try to create a new little RAID 1/0 LUN and then allocate it to your server, is it detected as RAID 5 too ?

Dennis,

i bet something needs to be cleaned up within ODM.

If the Lun type of Lun presented to an AIX host is changed from Raid5 to Raid10 the AIX host would treat the Lun as a new disk with a new hdisk#. This is why when you use the migrate function the Cx mask the Lun type change to AIX, otherwise it would look like a failed disk along with a new disk added..

Yes I see what you mean with the CLARiiON migrate feature. But I would like you to do a test, just create a RAID 1/0 lun, add it directly in the storage group and see if it is detected correctly. Then we could see if there is a ghost behaviour of the previous RAID 5 lun, or if globaly the server sees every lun as RAID 5.

I create the new R1/0 LUN and present to my host.
It identify the type is R1/0.

ODM seems that keep the existing R5 LUN info, so it can't identify the RAID type changed.

How to delete the info via ODM? Will Data be still alive if I clear the info via ODM?

Thanks,
Dennis

emc93300

data will be there intact. Before you try this ..did you run powermt config after you ran emc_cfgmgr ?

Yes, data will be there intact.

follow emc93300 doc, it need to remove fiber card instance.

It's possible to run my environment because I have only on fiber card and use it for booting.

run following command:

odmdelete -q name=$i -o CuAt
odmdelete -q name=$i -o CuDv
odmdelete -q value3=$i -o CuDvDr
done
odmdelete -q name=powerpath0 -o CuDv
odmdelete -q name=powerpath0 -o CuAt
rm /dev/powerpath0

the RAID type is still R5.

Thanks for your respones.
Dennis

so i see you also tried solution emc108127. It mentions removing and re-installing PowerPath, so if you are booting from the SAN and PowerPath is not there ..you can tell AIX to boot from a native disk and not hdisk ..can't you ?

As noted by colddesertrat, even though the RAID type has been changed, the array will continue to return consistent LUN configuration information to the host, to ensure the host continues to see the same LUNs in an identical manner. Part of the configuration information that is returned to a host is a text string that contains the characters "RAID 5" for a LUN originally built on a RAID 5 group, "RAID 3" for a LUN originally built on a RAID 3 group, etc. Even though the RAID type has been changed during a LUN Migration action to now be RAID 1/0, the array will continue to report the original text string, which in this case is "RAID 5". This does not have any functional impact on the LUNs (that is, the RAID type really has been changed). Also see Support Solutions emc154613 and emc150097.

Regards,
DGM

oh wow ..did not know that. This behavior does not apply to DMX does it ? For example if i change STD device to an R1 ?

Thanks

Wow indeed.... And how do you get it right ? Remove the LUN from the SG and re-insert it again or isn't it possible at all, besides unbinding the LUN and recreating it ?