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Network-attached storage

Network-attached storage
Network-attached storage (NAS) is file-level computer data storage connected to a computer network providing data access to a heterogeneous group of clients. NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements. NAS is often manufactured as a computer appliance – a specialized computer built from the ground up for storing and serving files – rather than simply a general purpose computer being used for the role.[nb 1] As of 2010[update] NAS devices are gaining popularity, as a convenient method of sharing files among multiple computers.[1] Potential benefits of network-attached storage, compared to file servers, include faster data access, easier administration, and simple configuration.[2] Note that hard drives with "NAS" in their name are functionally the same as other drives. Description[edit] A Netgear NAS NAS vs. NAS vs. Visual differentiation of NAS vs. History[edit] Implementation[edit] Uses[edit] Related:  bigscary78

Cloutage - Tracking Cloud Incidents, Security, and Outages Tape Backup vs Hard Disk Backup: What Does the Future Hold? I was frequenting Spiceworks earlier today and came across a post asking if “tape was legacy”. I think what they were asking is whether backup to tape is the kind of legacy technology today that we see with VHS—there are still a few out there but the technology is on its way out. I realize that there are still advantages with tape when it comes to large volume backups and the ability to physically move the backup media to an offsite location. But even with these advantages it seems that backups to disk (and dare I say to the cloud?) have so many more advantages. Let’s do a quick comparison of tape and disk storage to consider the advantages of each: Capacity “As of 2011, the highest capacity tape cartridges (T10000C) can store 5 TB of uncompressed data” (source Wikipedia), while hard drives have followed Kryder’s law (much like Moore’s law) and doubled areal density every two to four years putting disk drive capacity currently somewhere around 4 TB. Speed Cost Ok, so there you have it.

Tape backup VS disk backup. The best tape backup software - EaseUS Todo Backup Server New trends in storage now make it easier than ever for companies to expand their data capacity. However, many companies continue to rely on tape backup as the primary media for backing up their data. When talking about backup storage people always think in terms of scalability of performance, reliability, security, and usability issues. The basics of backup management haven't changed much over the past year, but new products and technologies have made it easier to address these issues, making extreme scalability in disk-based data backup much more feasible and desirable than the traditional tape backup. Comparing in speed - As a primary target for backup, disk has quickly become accepted as the optimal media. Comparing in costs - Disk-based backups don't suffer from the same incremental restore penalties experienced by tape drives. Disk versus tape technology Understanding the facts First, tape can be removed. Disk-based Backups Major advantages of disk technology Faster restores

Storage Optimization Techniques: Review the Benefits of Thin Provisioning Introduction For several years Wikibon has been studying the benefits of virtualization and thin provisioning. Our research spans dozens of detailed customer interviews and studies of many hundreds of customers over several thousand storage volumes. As well, our information has been validated through Wikibon's Energy Lab, which produces studies designed to assist customers in understanding the degree to which a product contributes to energy efficiency. Our objectives in conducting efficiency analyses are to identify not only the hardware impacts on issues related to utilization and energy consumption but more importantly the hard-to-quantify green software aspects of technologies. Wikibon Energy Lab Validation Reports are submitted to utilities such as Pacific Gas & Electric Company as part of an energy incentive qualification process where often outside engineering firms have validated our findings. Storage Systems 101 Enter Storage Virtualization and Thin Provisioning

RAID Levels Explained If you've ever looked into purchasing a NAS device or server, particularly for a small business, you've no doubt come across the term "RAID." RAID stands for Redundant Array of Inexpensive (or sometimes "Independent") Disks. In general, a RAID-enabled system uses two or more hard disks to improve the performance or provide some level of fault tolerance for a machine—typically a NAS or server. The way in which you configure that fault tolerance depends on the RAID level you set up. RAID Overview RAID is traditionally implemented in businesses and organizations where disk fault tolerance and optimized performance are must-haves, not luxuries. Software RAID means you can setup RAID without need for a dedicated hardware RAID controller. This type of RAID is available in other operating systems as well, including OS X Server, Linux, and Windows Servers. Which RAID Is Right for Me? Here's the rundown on popular RAID levels: •RAID 0 is used to boost a server's performance.

VM-aware storage provides better migration, performance and more VM-aware storage is a hot topic right now in the virtualization world, according to storage and virtualization expert Stephen Foskett. In the past year there was an increase in storage developed specifically for virtual machines. These storage systems enhance data migration, performance and integration with virtual server environments. However, some VM storage products will only work well if virtual machines are the only workloads running on it, which may not benefit organizations that haven't virtualized their entire environment. How are vendors making VM-aware storage different from traditional storage, and what are some of the common features that can be found with it? Stephen Foskett: That's really a major industry trend right now. You mentioned VM-aware storage having better data movement and performance. Foskett: The number one advantage is that … virtualization breaks storage. That's especially true with small businesses.

Understanding Clones Features | Documentation | Knowledge Base | Discussion Forums Prev Contents Last Next A clone is a copy of an existing virtual machine. The existing virtual machine is called the parent of the clone. When the cloning operation is complete, the clone is a separate virtual machine — though it may share virtual disks with the parent virtual machine: see Full and Linked Clones). Changes made to a clone do not affect the parent virtual machine. If you want to save the current state of the virtual machine, so you can revert to that state in case you make a mistake, take a snapshot. Why Make a Clone? Installing a guest operating system and applications can be time consuming. Clones are useful when you must deploy many identical virtual machines to a group. An MIS department can clone a virtual machine for each employee, with a suite of preconfigured office applications. Full and Linked Clones There are two types of clone: Full Clones Linked Clones A linked clone must have access to the parent.

SAN Based replication ? no problem.. latency.. Problem.. | Interestingevan's Blog Disaster recovery has become something which is moving higher and higher up agenda on companies “to do” list. Its becoming increasingly more apparent what the costs to a given business are when companies suffer downtime and/or loss of data.. people are starting to think about the monetary cost to the business is when services or applications are unavailable to both internal staff and more importantly customers and with the big push of server virtualization over the last few years.. where is application data/file data/the application server itself sitting ? on the SAN; so it makes sense to leverage that existing infrastructure in the SAN and use some form of SAN based replication. So what do you do to make sure the DR solution you have in mind is feasible and realistic ? Firstly make sure you pick the right technology First port of call is sitting down with the customer and mapping out the availability requirements of their applications. Mirrorview A-Syncronous (EMC) EMC RecoverPoint

Limitations of host-based mirroring for stretched clusters | Dirty Cache For data mirroring, EMC SRDF is sometimes used in such a setup that both servers write to one location only (the “far” server writes across dark fibre links to the local storage). EMC has similar tools (Mirrorview, Recoverpoint, etc) for other storage platforms than Symmetrix. SRDF cluster with passive target This, as said, has the disadvantage that if the active storage system (or the whole site) goes down, the cluster still goes down and has to be manually restarted from the failover site. SRDF cluster failure recovery Host Based Mirroring A seemingly attractive alternative exists for replicating storage across multiple datacenters: Host Based Mirroring. As Oracle Automatic Storage Management (ASM) fulfills all of these requirements, many customers choose to move away from Unix style volume managers and use Oracle ASM instead. The idea is that if a site failure happens, the cluster keeps running without recovery as storage on both locations was active anyway. License cost CPU overhead

Interestingevan's Blog | Datacentre Musings Storage architecture choices: SANs By Yuval Shavit, Features Writer Storage area networks (SANs), which were once available only to large enterprises that could afford to pay steep premiums for the best storage, are increasingly moving downstream. SANs combine the benefits of shared storage with those of direct-attached storage (DAS), and newer technologies make them affordable even for small businesses. Storage acronyms: SAN, NAS and DAS The three main ways of connecting storage to servers are SANs, network-attached storage (NAS) and DAS. SANs and NAS both separate data storage from servers, allowing servers to share those resources. Benefits of SANs Why storage area networks? Because SANs can consist of several physically separate drives or arrays, they also offer replication and disaster recovery features. SANs also complement server virtualization. Cost of SANs A traditional SAN works on a Fibre Channel (FC) network. Dig deeper on Storage Area Network (SAN)