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Environment:DELL EMC SW: NDM for hyper VMAXDELL EMC SW: PowerPath for AIXDELL EMC array: VMAX running 5977 code or laterOperating system: AIX 6.x, AIX 7.xNDM is used to migrate an AIX PowerPath pseudo device. Following an NDM migration of rootvg, "/" is mounted in Read-Only mode after the cutover: df ksh: The file system has read permission only. Filesystem 512-blocks Free %Used Iused %Iused Mounted on /dev/hd4 4194304 3544688 16% 11943 3% / /dev/hd2 10485760 5534144 48% 51552 8% /usr /dev/hd9var 4194304 2079720 51% 11011 5% /var /dev/hd3 6291456 3119384 51% 883 1% /tmp /dev/hd1 2097152 1098064 48% 2771 3% /home /dev/hd11admin 1048576 1047696 1% 9 1% /admin /proc - - - - - /proc /dev/hd10opt 2097152 1590752 25% 7284 4% /opt ... touch /tmp/abc ksh: The file system has read permission only. ksh: touch: 0403-006 Execute permission denied.
As per Appendix B of VMAX NON-DISRUPTIVE MIGRATION document, properly configuring multiple paths to the host with AIX 6.x, AIX 7.x, GPFS, and PowerPath requires an additional step when performing an NDM migration.After the NDM create operation is completea, the target devices (appearing to the host as additional paths to the source devices) are masked and available. After running cfgmgr to create the host native devices, the [attached] script, named emc_pp_configure.sh, must be run immediately following the completion of the cfgmgr command. The script configures the new native devices on the target side into PowerPath by copying the attributes of the PowerPath hdiskpower pseudo devices into the new native devices and reconfigures the native devices.Note: This script MUST be used in order to perform a migration nondisruptively in this environment. Failing to run the script following the configuration of the new native target devices may lead to data unavailability. #! /bin/ksh devlist=`powermt config 2>&1 | grep -p 0514-034 | grep hdiskpower | awk '{print $5}'` for pseudo in $devlist do pseudo_policy=`lsattr -El $pseudo -a reserve_policy | awk '{print $2}'` pseudo_prkey=`lsattr -El $pseudo -a PR_key_value | awk '{print $2}'` nativelist=`powermt display dev=$pseudo | grep -i hdisk| grep -v power | awk '{print $3}'` echo $nativelist for native in $nativelist do native_policy=`lsattr -El $native -a reserve_policy | awk '{print $2}'` native_prkey=`lsattr -El $native -a PR_key_value | awk '{print $2}'` #change reserve_policy and PR_key_value of native(s), whose policy or PR_key_value #vary from that of pseudo. if [[ $native_policy != $pseudo_policy || $native_prkey != pseudo_prkey ]] then powermt remove dev=$native echo changing reserve_policy,PR_key_value of $native to $pseudo_policy and $pseudo_prkey chdev -l $native -a reserve_policy=$pseudo_policy -a PR_key_value=$pseudo_prkey fi done done powermt config The script, emc_pp_configure.sh, can be downloaded on Dell EMC's support site at:https://support.emc.com/search/?text=powerpath&facetResource=ST&facetProductId=1726
After the NDM create operation is complete, run a "cfgmr" to discover the new path to the devices, followed by a "powermt config." Run the Dell EMC provided script "emc_pp_configer.sh" script.If the migration includes rootvg, update the bootlist to include the new hdisks pointing to the target array. If required, run a "pprootdev fix," and run a "bosboot -ad /dev/ipldevice" to update the boot disk.These steps are required after completion of the NDM create command (symdm create).