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CLARiiON LAB Exercise- Session -I

I am going to demonstrate full LAB exercise of CLARiiON. If anybody interested to any specific LAB exercise please send me mail I will try to help and give LAB exercise. There are many exercise like: 1) Create RAID Group 2) Bind the LUN 3) Create Storage Group 4) Register the Host [...]

Restrictions & recommendations for binding disks into LUNs:

LUN to bind Restrictions and recommendations ----------- Any LUN You can bind only unbound disk modules. All disk modules in a must have the same capacity to fully use the modules' storage space. --- In AX-series storage systems, binding disks into LUNs is not supported.[...]

How to reduce power consumption on DMX?

There are two primary ways to reduce power consumption by carefully configuring the storage array itself and by taking advantage of EMC tools. Useful tips that will help to design an efficient DMX-3 array, including: 1) Minimizing DA pairs required. 2) Using more daisy chain storage bays to obtain needed capacity with fewer DA pairs. 3) Fully loading drive enclosures with drives (15) to reduce excess power overhead from cooling, logic, and power supply load efficiency. [...]

Best Practice for Oracle and Volume Manager for EMC Symmetrix DMX-3 Storage

Veritas Disk Group Configuration Guidelines:- 1) Use multiple Disk Groups—preferably a minimum of four; place the DATA, REDO, TEMP, UNDO, and FRA archive logs in different (separate) Veritas Disk Groups 2) Optimally, use RAID 1 for tier 1 storage[...]

Performance Tunning

Performance tuning has always been a challenge for System administrators and Database administrators for a long time. As virtualization continues to grow in every aspect of the IT infrastructure, tuning the OS, DB or storage tends to become even more complex.[...]

Working with the CLARiiON system cache

For best performance with most applications, each SP should have its maximum amount of cache memory and you should use the default settings for the cache properties. Analyzer shows how the cache affects the storage system, and lets you tune the cache properties to best suit your application. A storage-system cache has two parts: a read cache and a write cache.[...]

TimeFinder/Mirror Consistent Split

Posted by Diwakar ADD COMMENTS

Think when you are creating a point-in-time image for multiple devices. It is easy to create a point-in-time image of entire set of logical device at same time. In order achieve this you need to shut down an application so that no IO will occurs while you creating a point-in-time image. This is big problem in today’s environment where every company looking solution for zero down time.
The EMC provided solution to this problem is called “Enginuity Consistency Assist”. When you create a set of sessions and invoke Enginuity Consistency Assist, the Symmetrix aligns the I/O of those devices and halts all I/O from the host systems very briefly—much faster than the applications can detect—while it creates the session. It then resumes normal operation without any application impact.
TimeFinder Consistent Split using (TimeFinder/Consistency Groups) allows the splitting off of a consistent, re-startable image of an Oracle database instance within seconds with no interruption to the online Oracle database instance.
Ÿ - Allows users to split off a dependent write consistent, re-startable image of application without interrupting online services
Ÿ - Using TimeFinder/Consistency Groups to defer write I/O at the Symmetrix before a split
Ÿ - Consistent split can be performed by any host running Solutions Enabler connected to the Symmetrix
Ÿ - Tested and available including HP-UX, Solaris, AIX, Linux, and Windows
Ÿ - No database shutdown or requirement to have database put into backup mode (Oracle).

Using TF/CG, consistent splits helps to avoid inconsistencies and restart problems that can occur with using Oracle hot-backup mode (not quiescing the database).

The major benefits of TF/CG are:
• No disruption to the online Oracle database to obtain a Point-in-Time image
• Provides a consistent, re-startable image of the Oracle database for testing new versions or database patch updates before deploying for use in production environments
• Can be used to obtain a business point of consistency for business restart requirements for which Oracle has been identified as one of multiple databases for such an environment.

The same benefits apply using TF/CG in a clustered environment as in a non-clustered environment:
- No disruption to the online Oracle database to obtain a Point-in-Time image in a Oracle single instance environment or when using Oracle Real Application Clusters
- Provides a consistent, re-startable image of the Oracle database for testing new versions or database patch updates before deploying for use in clustered production environments
- Can be used to obtain a business point of consistency for business restart requirements for which Oracle has been identified as one of multiple databases for such an environment.