Category: Storage

SQL Server Backup With Data Domain using DDBoost

Data Domain is a purpose-built backup appliance used by many organizations to store backup data. The Data Domain appliance can be used as a Common Internet File System (CIFS)/Server Message Block (SMB) or Network File System (NFS) file share. Data Domain can also be integrated into various traditional backup applications. This makes it an excellent option for enterprises to use as a target for a wide range of backup applications. You can find more information about Data Domain in the following link. https://en.wikipedia.org/wiki/Dell_EMC_Data_Domain EMC released Data Domain Boost for Microsoft Applications in the first half of 2014. This tool has…

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Write Technology in Cache

In this post, I want to briefly describe three types of caches: write-through, write-back, and write-around. The cache is semiconductor memory where data is placed temporarily to reduce the time required to service I/O requests from the host. Write operations with cache provide performance advantages over writing directly to disks. A write operation with cache is implemented in three ways which have its advantages and disadvantages. Write-back cache: Data is placed in cache and an acknowledgment is sent to the host immediately. Later, data from several writes are committed to the disk. Write response times are much faster because the write operations…

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Finding Latency Problem in ESXi

One of the common problems in software-defined datacenters is the latency of the virtual machine disk which will slow down the application and increase response time. The virtual machine owner or user declares that its system is slow and the question arises whether the slowdown is coming from a virtual infrastructure or storage device or operating system and how to troubleshoot it? In this section, we will discuss the storage parameters in VMware ESXi and show you how troubleshot disk latency in your environment. Lets SSH to ESXi host and leverage esxtop command to identify the problem. Esxtop allows monitoring…

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Where soft zoning is preferred over hard zoning

Zoning is an FC switch function that enables nodes within the fabric to be logically segmented into groups that can communicate with each other. The zoning function controls this process by allowing only the members in the same zone to establish these link-level services. Zoning includes three types: Port zoning or hard zoning: It uses the FC addresses of the physical ports to define zones. In port zoning, access to data is determined by the physical switch port to which a node is connected. Although this method is secure, it requires updating of zoning configuration information in the event of…

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What is the minimum number of disks to meet the requirements of the application ?

The application I/O size and the number of I/Os the application generates are two important measures affecting disk performance and response time. Consequently, the storage design and layout for an application commences with the following: Analyzing the number of I/Os generated at peak workload Documenting the application I/O size or block size Storage requirements for an application are specified in terms of both capacity and the IOPS that should be met for the application. If an application needs 200GB of disk space, then this capacity could currently be provided with a single disk. However, if the application I/O demands are…

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