Storage Nitty-Gritty 5 of 5 – Replication

Replication Terms PIT (point in time) replica – snapshot of the source at some specific timestamp;Continuous Replica – always in-sync with the production data;Recoverability – enables restoration of data from the replica to the source if data loss or corruption occurs;Restartability – enables restarting business operations using the replicas; Local Replication Use Case: Alternative source … Read moreStorage Nitty-Gritty 5 of 5 – Replication

Storage Nitty-Gritty 4 of 5 – Backup and Archive Solutions

Business Continuity Information Availability IA = MTBF/(MTBF+MTTR), where* MTBF (Mean Time Between Failure) – average time available for a system or component to perform its normal operations between failures.* MTTR (Mean Time to Repair) – the average time required to repair a failed component. Disaster Recovery – the coordinated process of restoring systems, data, and … Read moreStorage Nitty-Gritty 4 of 5 – Backup and Archive Solutions

Storage Nitty-Gritty 3 of 5 – NAS and Object Storage

NAS (network attached storage) NAS server is dedicated to file-serving. NAS device runs its own specialized operating system that is optimized for file I/O, integrated hardware and software component that meets specific file-service needs, and performs file I/O better than a general-purpose server. NAS device can serve more clients than general-purpose servers and provide the … Read moreStorage Nitty-Gritty 3 of 5 – NAS and Object Storage

Storage Nitty-Gritty 2 of 5 – SAN

In direct attached storage (DAS), storage is server centric and the host owns the storage. The storage is fully dedicated to the server that owns it. Storage has evolved into information centric model. In this model, when a new server is deployed in the environment, storage is assigned from the same shared storage pool to … Read moreStorage Nitty-Gritty 2 of 5 – SAN

Application I/O Characteristics

There are many unknown factors and randomness when a solution architect determines storage requirement for an application. However, this process should still be as scientific as it can be and here are some of the important considerations regards application I/O characteristics. Random and Sequential Ramdom I/O Sequential I/O Successive read/write operations from noncontiguous addresses – … Read moreApplication I/O Characteristics

Storage Nitty-Gritty 1 of 5 – Disk and RAID

On my trip I have been through several pre-sales discussions on storage. Therefore I’m taking this opportunities to write up a series of postings deep diving into storage technologies. In this first section, we lay out the foundation of storage technology, from physical device to RAID, focusing on the concepts. Some contents are excerpts from … Read moreStorage Nitty-Gritty 1 of 5 – Disk and RAID