VMware will create a VM snapshot for each VM located in the LUN to ensure a consistent state in the snapshot, as seen below:įurthermore, QNAP Snapshot Agent also includes VSS Hardware Provider for Windows Server.SQL Server will flush the database logs on the disk to ensure a consistent state in the snapshot.Microsoft Hyper-V Server will create a VM checkpoint including the memory to avoid data loss and to ensure a consistent state in the snapshot.In the first workflow below, whenever you need to take a snapshot on a iSCSI LUN from the NAS, the agent will inform the remote server to flush all the data into the iSCSI LUN (for Windows Server) or to take a virtual machine snapshot before the iSCSI LUN snapshot (for VMware), therefore when a snapshot is taken from the NAS, it will contain all the necessary application data to ensure a consistent snapshot. QNAP Snapshot Agent is created mainly to allow taking Application Consistent snapshots for an iSCSI LUN, while at the same time it also provides a VSS Hardware Provider feature. Some terms in this document will not be explained in detail. This application note is suitable for anyone using a QNAP NAS as an iSCSI target to create an iSCSI LUN for other devices or virtual machines. It allows the NAS to communicate with the remote server to ensure that you can have a complete backup using our QNAP snapshot function. The solution provided by QNAP is an Application Consistent option for iSCSI snapshots while using QNAP Snapshot Agent for Windows Server or VMware vCenter. The challenge when creating a LUN snapshot is to ensure that all data is included, such as unsaved application data, buffers, memory and logs.
In QTS 4.2, the snapshot function in Storage Manager supports not only volumes, but also iSCSI LUNs to rapidly back up and restore your valuable data.
Introduction 1.1 Challenges and Solutions Guideline for Choosing and Upgrading NASġ.Video Surveillance Device Management System.Configure network settings (QNE Network).Configure network settings (QTS & QuTS hero).With Linux and ZFS, QuTS hero supports advanced data reduction technologies for further driving down costs and increasing reliablility of SSD (all-flash) storage.
QuTS hero is the operating system for high-end and enterprise QNAP NAS models. WIth Linux and ext4, QTS enables reliable storage for everyone with versatile value-added features and apps, such as snapshots, Plex media servers, and easy access of your personal cloud. QTS is the operating system for entry- and mid-level QNAP NAS.
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