In Figure 6-4,there are two active checkpoints ckpti-2 and ckpti-1. If block n is going to be modified, a new block m will be allocated and the old content of n is copied to it. The address for block m will be inserted into the list of mappings for the block n in the latest checkpoint, which is ckpti-1. From this point, any request for block n in ckpti-2 and ckpti-1 will be redirected to the block m.

From this, we can tell from a mapping table when system blocks are modified relative to active checkpoints.

Referring to Figure 6-2,ckpti-2 is created and then without modifying block n - ckpti-1 is created. Therefore ckpti-2 and ckpti-1 represent the same content for block n. Before the creation of ckpti, block n had been modified. A copy of the before change content is made and put into the mapping for the most recent checkpoint which at that time was ckpti-1. Because both ckpti-1 and ckpti-2 expect to see the same content for block n, the mapping from n to m is shared by both of them.

FIGURE 6-4Mappings for Block n After Modification

In Figure 6-2,Ckpti is created and without modifying block n, ckpti+1 is created and then block n is modified again. This causes the creation of block p and mapping from n to p for checkpoint ckpti and ckpti+1.

When deleting a block in LFS, the system first checks if there is a mapping for the block in the most recent checkpoint or not (considering SFS2CP_ALLO_MARKER a valid mapping). If there is a mapping, it frees the block. Otherwise, it puts the address of block into the mapping for it, creating a one to one mapping for that block. This is called page stealing of CFS from LFS.

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

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Sun Microsystems 5310 NAS manual 4Mappings for Block n After Modification
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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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