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DataON_DNS_Serials_Support_SSDsFlashed-based solid-state drives (SSDs) are becoming a big issue for enterprise storage users; a number of customers I work with are planning for this new "tier 0" data storage for a number of reasons. It could be as simple as IOPS  per watt, IOPS per dollar, or for some applications, bandwidth per GB/sec of storage.

 

SSDs have a number of disadvantages compared to traditional disk storage, the biggest by far being cost. There are those who claim that spinning hard drives will soon be a thing of the past because of flash SSDs, but I can't see that happening anytime soon, and if it does, the devices that replace spinning hard drives will not be based on flash and won't appear much before the end of this decade (see I/O Bottlenecks: Biggest Threat to Data Storage). Vendors have been claiming tape is dead for the last 20 years, but it continues to play a big role in data protection schemes. There will always be tiers of storage, it seems.
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VM DataCenter 2.0 simplifies the management of the storage for virtualized environments, and specifically VMware's ESX and Citrix's Xen server.

 

This optional module integrates seamlessly into the NexentaStor web GUI, and provides a single point of control to manage all storage related aspects of virtualized servers.

 

Capabilities include:

  • establish storage policies, including scheduled backups and replication, for each VM data set from one user interface
  • perform common VM management tasks such as starting and stopping VMs
  • use templates to clone VMs at a fraction of the time of cloning within virtualized environments.
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NMC 'foreach' primitive is yet another enhancement to quickly create high-power custom scripts, or simply execute any number of NMC commands in a loop.

The outline of NMC 'foreach' loop follows below:

 nmc$ foreach var (value1, value, ...)
(f)nmc$ some-command
(f)nmc$ other-command
...
...
(f)nmc$ endfor
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Auto-sync is one of the NexentaStor provided data replication mechanisms. It is a schedulable, fault-managed, fully configurable (tunable) NexentaStor Data Replication service that can be used in a variety of backup, archiving, and DR scenarios.

 

  • For general and background information, please see Data Replication.
  • For NexentaStor Automatic Continuous Data Protection (CDP) extension, please see AutoCDP.

During the last several release iterations, auto-sync replication has been significantly improved, and a number of new features added. That includes:

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