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Learning Clones by an example (symclone)

As a storage specialist, say your interest is to configure EMC clones and get going. You google around and find out pdfs and websites explaining bits and bobs, but nothing that could give you an overall picture. You’re gonna love this article in that case. It gives a quick overview of clones in EMC world […]

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Script – To check the status of SRDF disks

Prod and DR servers have R1/R2s assigned and VxVM is being used on the server. All SRDF related operations are performed at the host level either from Prod or DR node. Ideally, all SRDF devs should be part of Veritas DG as well as symdg. What happens when you perform the DR test, and after […]

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EMC – How to set up Concurrent SRDF

Concurrent SRDF could be used in a couple of scenarios such as setting up a temporary replication to another array in order to migrate large amount of data, or a permanent solution as part of DR strategy. Below are the steps that should generally be followed in order to set up the replication for a […]

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EMC – SRDF – Operational Commands

SRDF related operational commands: How to list RA ports between 2 EMCs # symcfg -sid 1234 list -RA all [–switched] Symmetrix ID: 000292601234                  S Y M M E T R I X    R D F    D I R E C T O R S                                          Remote        Local    Remote Ident  Symb  Num  Slot  Type       Attr  SymmID        RA Grp   RA Grp  Status RF-5H   05H  117     5  RDF-BI-DIR   –   000292605678   […]

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EMC – SRDF Status

This post illustrates the outcome of various SRDF commands, prerequisites to run them, and a one liner description of various opertations. Various Pair Status: Synchronized – R1 and R2s are in synchronized state, and both have same content with no invalid tracks between R1/R2. SyncInProg – Synchronization is underway between R1 and R2 because there […]

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EMC – Symmetrix Access Control – symacl

With Enginuity 5875 and SE 7.2.0, new array based licensing has been introduced. This means any host attached to the array with SE installed will have unrestricted access to the array and can make configuration changes. This has necessiated the implementation of Host based Symmetrix Access Control on the arrays. The purpose is to disable […]

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EMC – Notes for day to day operation

DISCLAIMER:Information mentioned below as been compiled from various sources such as first hand experience by myself and my colleagues, from webpages searched via google etc. I do not take credit for the tips mentioned below. If a linux host using QLogic card is seeing 18 paths per disk instead of 2, chances are you might […]

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EMC – SRDF Theory

EMC SRDF (Symmetrix Remote Data Facility) is a replication product which can be used to replicate the data from one array to second array. Primary use is for business continuity/disaster recovery. Other use is migrating the data from one array to another. This post contains brief explanation of terms associated with SRDF, its operational use, […]

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EMC – Working with PowerPath

EMC PowerPath is a software designed for load balancing, path management, and device management. For each storage device assigned, it creates a virtual emc powerpath device named as emcpower### where ### is a number. Quite a powerful utility. Most of the magic is in the binary /etc/powermt. You can all read the powerpath guide to […]

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EMC – Setting up SNAPS (snapshots) on VMAX

Application is using tdevs from thin pool on VMAX. Everything is running fine, and the business is happy. Because everyone is happy, the business grows, and so does the data. Now the backups are taking for ever. Suggestion put forward is to use snapshots of tdevs and back them up. Stop the application, take the […]

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