Checkpoints of a volume are accessed through a separate fs_online. This volume corresponds to the virtual checkpoint volume created when checkpoints are made enabled on a volume.

Logical volume

vol1

vol1.chkpnt

checkpoint

database

Physical volume

FIGURE 6-1

/vol1

Physical and Logical Volume Relationship

As shown in Figure 6-1,the existence of checkpoint database distinguishes the checkpoint volume or CFS (Checkpoint File System) from the main volume or LFS (Live File System). The checkpoint database is the data structure that virtually holds different versions of an LFS. It is functioning as a mapping function that maps a virtual block address to its corresponding real address on the live file system.

The checkpoint database is a flat, sparse file with one entry per each block address in the live file system. Each entry is an array of 16 block addresses. When the mapping function tries to resolve a virtual block address, it first locates the corresponding entry in the checkpoint database. In order to do this, it uses the virtual block address as an index to the file. It then uses the cpid (stored in the corresponding file-handle of the object) as index to the entry array to find the proper real block address.

6-2Sun StorEdge 5310 NAS Troubleshooting Guide • December 2004

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Sun Microsystems 5310 NAS manual Physical and Logical Volume Relationship
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5310 NAS specifications

Sun Microsystems, known for its innovative computing solutions, launched the Sun 5310 Network Attached Storage (NAS) system, which marked a significant advancement in the realm of storage solutions in the early 2000s. The 5310 NAS was designed to provide high-performance, reliable, and scalable storage tailored for enterprise environments.

One of the standout features of the Sun 5310 NAS is its file-serving capabilities, which support multiple protocols, notably NFS (Network File System) and CIFS (Common Internet File System). This dual-protocol support allowed organizations to seamlessly integrate the NAS into diverse IT ecosystems, facilitating interoperability between UNIX, Linux, and Windows systems. The enhanced file-sharing capabilities made it an ideal solution for businesses with mixed operating environments.

The Sun 5310 NAS incorporates cutting-edge technologies to ensure high availability and data integrity. The system utilized a RAID (Redundant Array of Independent Disks) technology, providing various RAID levels to protect against data loss while optimizing performance. Additionally, the device featured hot-swappable drives, enabling maintenance and upgrades with minimal downtime, a crucial factor for business continuity.

Equipped with advanced management software, the Sun 5310 NAS offered users an intuitive interface for monitoring storage health and performance. This software included comprehensive reporting functionalities that allowed IT administrators to oversee usage patterns and capacity planning efficiently.

Scalability was another defining characteristic of the Sun 5310 NAS. The system could easily expand with additional storage modules, accommodating the growing needs of an organization without the necessity for complete system overhauls. This flexibility ensured that businesses could adapt their storage solutions to meet evolving data storage needs without incurring significant costs or disruptions.

In terms of performance, the Sun 5310 NAS featured high I/O throughput achieved through its robust hardware architecture and optimized file serving capabilities. This performance baseline was crucial for organizations that relied on heavy data workloads and required rapid access to information.

In summary, the Sun 5310 NAS from Sun Microsystems embodied a forward-thinking approach to network storage, blending reliability, scalability, and multi-protocol support. Its user-friendly management software, combined with the robustness of RAID technology and hot-swappable drives, made it a preferred choice for enterprises looking to streamline their storage infrastructure while safeguarding critical data.
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