* Phase 2: Performing Intra-node balance checks: * No inter-node tunes need to be run at this time.
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–Node Disk availability & percentage use-– * PD Node Balance Summary – Device type usage across nodesĭevice type: FC10 Average Usage per node “72.00”% threshold “75.00”%ĭevice type: NL7 Average Usage per node “48.00”% threshold “51.00”%
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Minimum number free chunklets in a PD – 20 – 363 – 20 Maximum number free chunklets in a PD – 682 – 2666 – 2666 Total Number of Available PDs 0 144 144 48 0 192 Number of Available PDs with no free chunklets 0 0 0 0 0 0 Number of Available PDs with free chunklets 0 144 144 48 0 192 –Description- 15K 10K 10K+15K NL SSD All In my case it was imbalanced so I next ran tunesys with the dry run switch to see exactly what tuning would be performed without actually going ahead and doing it.Īre you sure you want to tune this storage system? To see what the current space distribution was I ran the following command to see the space layout for NL and FC disks respectivelyģPARSAN1 cli% showpd -space -p -devtype NLģPARSAN1 cli% showpd -space -p -devtype FC So in simple terms, phase 1 is useful when adding additional nodes, phase 3 is useful when amending CPG characteristics and of most interest in this case was phase 2 to balance the chunklets across the new disks added to the system.
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LDs where the current characteristics differ from the associated Phase 2 – Analyzes and rebalances space usage between disks associated with each node (intra-node tuning). Phase 1 – Analyzes and rebalances virtual volume capacity imbalance between nodes (inter-node tuning). Tunesys runs through 3 separate stages in order to rebalance the system these are: To rectify this you need to run tunesys which is essentially a system rebalancing tool. The next step is to rebalance the system, as the new disks will be almost empty whilst your pre-existing disks hold all your data. As my CPG’s were set to use all available FC and NL disks they were added as a available to the CPG with no further action required. Once you have ran admitpd you should see your disks as available for use. You will then need to issue an admitpd to get the system to recognise the new disks.
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Once all the disk are in the system if you have exceeded the number of disks you are already licenced for you will need to install additional disk licences with a setlicence command. Drives must be installed in identical pairs starting at the bottom left and no spaces must be left
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The 7400 system is configured with 2 large form factor shelves and 5 small form factor. The system had some empty slots in the already existing cages, so the plan was to fill all the empty slots with new disks. One of our 3Par system was becoming full, in terms of capacity so it was time to add some new disks.