How to perform storage migration from IBM to Hitachi?
Please follow the below host based storage migration steps
in dual vio setup.
ü Take
the backup of the Lpar (Mksysb and TSM for datavg), and take the backup of VIOS
(VIOSBR and VIOSBR)
ü Share
the current configuration (IBM disks info) to the storage team (No of disks and
size of the disks), and ask storage people to provide the new Hitachi disks
based on the current configuration.
ü Execute
"cfgmgr"on the vios servers to make sure the newly added Hitachi disks
are available with the correct size and note the LUN info.
ü Change
the disk's attribute like the algorithm and reserve_policy
ü Map
the disks to the lpar with the help of mkvdev command (mkvdev –vadapter vhost#
-vdev hdisk# -dev vtd_name)
ü Come
to the Lpar and then execute the cfgmgr and confirm the number of disks and
size of the disks also the disks having the two path.
ü Change
the attribute of healthcheck_interval
ü Extend
the disks to the VG and then execute the migratepv command (nohup migratepv
IBM_disk Hitachi_disk &)
ü Once
the migraiton is completed, take it out the old IBM disks by executing the
reducevg command (Reducevg datavg IBM_disk)
ü Remove
the disks from the lpar by executing rmdev
ü Now
going to VIOS server and then delete the IBM disks VTD Mapping and then delete
the IBM disks.
ü Once
you delete the IBM disks, ask the storage people to unmap the IBM disks from
their end, once they did, we will execute the cfgmgr and make sure the IBM
disks cannot return back.
Note:
ü Ask
the app people to shutdown the app/DB (This is OPTIONAL if your management
wants to make sure to avoid any risks - we can perform rootvg+datavg migration on
the fly. However if we perform the storage migration on cluster (HACMP)
environment, we need to down the app (In cluster end - bring resource group
offline) to avoid risks.
ü We
can perform the storage migration in SAN based also. Steps are slightly differ
from Host based method.
ü We
can perform the migration by using the below methods.
ü 1.
Migratepv
ü 2.
Mirrorvg
ü 3.
Alt disk install
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