QStora

 iSCSI is an acronym for Internet Small Computer Systems Interface, an Internet Protocol (IP)-based storage networking standard for linking data storage facilities. iSCSI works on top of the Transport Control Protocol (TCP), and provides block-level access between the iSCSI initiator and the storage target by carrying SCSI commands over a TCP/IP network. iSCSI is used to facilitate data transfers over intranets and to manage storage over long distances. iSCSI can be used to transmit data over local area networks (LANs), wide area networks (WANs), or the Internet, and can  enable  location-independent data storage and retrieval. Overview of the overall architecture iSCSI   is a remote mapping technology that maps a storage device on a remote server to the local area and presents it as a block device (which can be thought of as a disk). From the perspective of the normal user, the mapped disk is no different from the locally connected disk. This mapping is based on the...

Thin provisioning provides efficient storage space utilization by allowing the system to present storage devices without occupying any space until data is written into logical volumes. For example, to create a 1TB logical volume, QStora does not allocate disk space immediately when it is created, but occupies the real capacity dynamically according to the written data. While thick provisioning means that the entire space is pre-allocated for the volume before use. Even if no data is written to the disk, creating a 1TB volume will actually take up physical disk space, and the occupied physical storage cannot be used for any other purpose. Thin provisioning gets rid of the upfront capacity reservation, thereby unlocking and freeing the capacity that would otherwise be reserved upfront and trapped within thick provisioned volumes. Thin Provisioning The advantages of thin provisioning include: Allows you to share resources between volumes. Some volumes may not use all or much...

M PIO is an acronym for MultiPath Input Output. This is a framework designed to configure load balancing and failover processes by providing multiple logical paths between storage devices and the server. The logical paths can be created through redundant physical components like buses, controllers, switches or bridge devices. Should one or more controllers, ports or switches fail, the server can route the I/O through an alternate path, the remaining controller, port or switch transparently and with no changes visible to the applications, other than perhaps resulting in increased latency.   Microsoft provides Device Specific Module (DSM) in Server 2008, 2012 and 2016, supports Asymmetric Logical Unit Access (ALUA), and can configure Multipath I/O (MPIO) environment with the storage device conforming to the SCSI Primary Commands (SPC) specification. DSM provides the load balancing policies, and load balance policies are generally dependent...

Single-vendor solutions are usually easier to implement and manage, but are also easier to lock in. When you need a new storage system, you may purchase storage arrays based on workload requirements. Traditionally, these systems included hardware and software, and you are locked in to purchase additional hardware for the system from the same vendor. When you need to increase storage capacity, or want to create multiple sites, you need to buy from the same vendor. You are locked into that vendor's technology road map and its price. If you don't want to be locked in by hardware vendors, you can choose software-defined storage. However, can all software-defined storage prevent you from being locked in by vendors? Some software-defined storage products claim to be software-defined, but they depend on specific hardware in the Hardware Compatibility List (HCL), driver compatibility issues often occur, and hardware and software vendors often blame each other. If you store data o...

As a Chief Information Officer (CIO) or corporate decision maker, you manage the corporate's IT operations and infrastructure. At present, the global economy is not very prosperous. You may not have much budget to buy new equipment, but there are growing storage requirements. You may have some servers for deploying applications, such as database, WEB application, etc., these servers have spare disk slots, and the utilization of CPU and memory may be not very high. So, why not make full use of these servers, fill up the disk slots, and let these servers be used for data storage at the same time? Especially for secondary storage like backups and archives, you don’t need to purchase a separate SAN storage device, you can use software-defined storage to save the TCO. Can all software-defined storage be mixed deployed with existing applications, regardless of the hardware environment and operating system? Of course not. Some software-defined stora...

We are a team which has the storage experts with more than 10 years' experience.  We have gone from vigorous young people to middle-aged people who have begun to have white hair. However, our enthusiasm for the storage business has not never changed. We have designed a storage product with single cluster storage data exceeding EB and 99.9999% availability per week for two consecutive years. We do not use open source storage, so we have more control over the code. Our product has served many major customers around the world. We are very proud of developing such a popular storage product. We hope that our storage product can be deployed and used by more people, and not only we can operate and maintain such a system. We believe that software-defined storage should be a very simple thing, just like other software, it should be able to be downloaded, installed and used like other software. Therefore, we use our existing storage experience to develop QStora to make it...

Storage controller  is a device that manages the physical  disk drives  and presents them to the computer as  logical units .  It is also called "storage processor" or "array controller". Storage controller integrates the storage space in multiple storage devices and provides them as a single storage space to the client. When receiving a write data request from the client, the storage controller decides which of the multiple storage devices to allocate the data to, and stores the data in the selected one. When receiving a read request from the client, the storage controller finds the location where the data is stored, reads the data from the storage device and transmits it to the client. The storage controller performs these tasks in an efficient and stable manner. In addition to reading and writing data, the storage controller also implements various value-added functions, including dynamic allocation of volume capacity, snapshots, and so on. QStora is a s...

QStora is the only software-defined storage product in the industry that can be mixed with any other applications. This feature will help you greatly improve the utilization of existing resources, greatly save the TCO, and you can easily migrate your QStora services to other servers. QStora is green. QStora runs as a group of user-mode processes, does not rely on any specific version of Linux kernel or distribution, does not rely on, or modify the operating system environment, does not monopolize the entire hard drive, and does not interfere with the execution of any other processes. Thus, QStora can run in the same Linux operating system instance concurrently with other applications. We call this feature "green". On the one hand, it can help users improve the utilization of existing hardware resource, on the other hand, it also lowers the barriers for potential users to try QStora - even a virtual machine is not needed! Some software-defined storage products cannot be in...

QStora  adopts a three-layer distributed storage architecture，and the block storage service can be managed in a single cluster in a unified manner. QStora Software Architecture As shown in Figure above，the functional architecture of QStora consists of: Prorocol layer: provides standard iSCSI interface for the applications to access the storage system. Service layer: provides block service. Persistence layer: implements persistent storage, provide functions such as Eresure Code, data rebuilding and rebalancing, disk management, data read/write capabilities and so on. Management: operates, manages, and maintains the system, and provides functions such as server management, LUN and Target management, install, upgrade, mointoring and alert reporting. The following table describes the modules in Management Layer. Module Description Server Management Manage servers in the cluster, you can add, delete servers, add and delete the disk paths on server, so as to expand and shr...

QStora is a  software-defined storage controller , which provides a high-performance  virtual storage array  in the form of virtual targets and logical volumes through standard Internet Small Computer System Interface (iSCSI) protocol. The traditional  hardware storage array  provides low latency and high availability for each logical volume, but has problems of poor horizontal scalability, high cost, and may form many "isolated data islands". That leads to high cost and low utilization of storage resource. Some traditional  distributed storage  looks quite attracting, but usually has the problems such as complex deployment, bad performance and poor stability. QStora delivers storage array in a quite different approach. QStora is a zip package, which can be easily installed on the Linux operating system of any brand and any configuration of physical servers, bare metal servers, virtual machines and even container instances. QStora is completely de...

QStora is a   software-defined storage controller , which can convert the commodity servers and their internal Hard Disk Drives (HDDs) and Solid State Drives (SDDs) to a high-performance   virtual storage array   and provide virtual targets and logical volumes through standard Internet Small Computer System Interface (iSCSI) protocol. QStora is particularly suitable for scenarios such as edge computing, hybrid cloud storage, secondary storage (backup/video surveillance), and hardware utilization enhancement. If deployed in a reliable hardware environment, QStora can even host critical workloads of the enterprises. QStora Architecture Here is the QStora Architecture. The bottom layer is the storage devices, a variety of storage media is supported, including NVMe SSD, SAS SSD, SATA SSD, SAS HDD, NL-SAS HDD, SATA HDD, and QLC SSD. These storage devices provides storage resource and are mounted to the Linux servers as disks. QStora organizes the local disks of the s...