Note – The data block size must be configured before any logical volumes are created on the units. Remember, this block size is used for every logical volume created on the unit. Therefore it is important to have similar application data configured per unit.

Data block size is universal throughout a partner group. Therefore, you cannot change it after you have created a volume. To change the data block size, you must first delete the volume(s), change the data block size, and then create new volume(s).

Caution – Unless you back up and restore the data on these volumes, it will be lost.

Enabling Mirrored Cache

By enabling mirrored cache, you can safeguard cached data if a controller fails.

Note – Mirrored cache is possible only in a redundant enterprise configuration.

Configuring Cache Allocation

Cache is allocated based on the read/write mix and it is dynamically adjusted by the controller firmware, based on the I/O profile of the application. If the application profile is configured for a 100% read environment, then 100% of the cache is used for reads. If the application profile has a high number of writes, then the upper limit for writes is set to 80%.

Logical Volumes

Also called a logical unit number (LUN), a logical volume is one or more disk drives that are grouped together to form a single unit. Each logical volume is represented to the host as a logical unit number. Using the format utility on the application host, you can view the logical volumes presented by the array. You can use this disk space as you would any physical disk, for example, to perform the following operations:

Install a file system

Use the device as a raw device (without any file system structure)

Partition the device

16 Sun StorEdge T3 and T3+ Array Configuration Guide • August 2001

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Sun Microsystems T3 manual Logical Volumes, Enabling Mirrored Cache, Configuring Cache Allocation

T3 specifications

Sun Microsystems T3 is a high-performance scalable server designed to meet the demanding requirements of enterprise-level computing. Introduced as part of the Sun Fire server lineup, the T3 was built to cater to organizations that needed both flexibility and reliability in their IT infrastructure.

One of the key features of the Sun T3 is its SPARC T3 processor, which integrates several cores on a single chip. This processor architecture allows for simultaneous multithreading, maximizing the utilization of resources and enhancing throughput. The SPARC T3 can support up to 16 cores, which means that it can handle a significant number of threads at once, making it an excellent choice for web applications, database processing, and other high-demand environments.

The T3's memory architecture also stands out. The system can support up to 1TB of memory with up to 128 DIMM slots, allowing for large data sets to be processed with ease. This large memory capacity provides ample room for memory-intensive applications and ensures smooth performance even under heavy loads.

Moreover, the Sun T3 is equipped with a unique virtualization technology known as Oracle VM Server for SPARC. This allows businesses to run multiple operating systems and applications on the same physical machine, reducing the need for additional hardware and simplifying management tasks. The virtualization capabilities contribute to cost savings while improving resource utilization.

In addition, the T3 features advanced I/O capabilities with multiple connectivity options, including Ethernet, Fibre Channel, and Serial Attached SCSI (SAS). This flexibility ensures that the system can be integrated into various network environments and supports a wide range of storage solutions.

Furthermore, the T3 is designed for enhanced energy efficiency. Sun Microsystems embedded their CoolThreads technology, which significantly reduces power consumption compared to traditional server architectures. This focus on energy efficiency not only helps in reducing operational costs but also supports corporate sustainability initiatives.

The T3 also incorporates robust security features, including hardware-based security mechanisms that protect data and facilitate secure operations. This is particularly important for businesses that handle sensitive information and are subject to regulatory compliance.

In summary, Sun Microsystems T3 is a formidable server that combines advanced processing power, scalability, virtualization capabilities, and energy efficiency. Its architecture and design make it suitable for a wide array of enterprise applications, positioning it as a reliable foundation for businesses looking to enhance their IT infrastructure.