• Learn D3 introduction document: scales


    Introduction FollowLearn D3: DataThe fourth article is only an English translation. The modifiable code is replaced by static pictures. If you want real-time interaction, please read the original text. Original text:Learn D3: Scales Version: Published Mar 24, 2020 Origin My GitHub text Among all tools of D3 data graph, the most basic is scale bar, […]

  • Raid concept – how raid-0-1-5-10 works


    Raid concept – how enterprise raid-0-1-5-10 works Redundant arrays of independent disks (RAID) are composed of “Independent Disks” with redundancyThe meaning of “array of capabilities” (one disk is broken and data is not lost). Disk array consists of many cheaper disks to hardware (RAID)Card) or software (mdadm) forms are combined into a disk group with […]

  • Clever use of Python for in


    import random Ou = “even”Ji = “odd”a = range(1,11) x = 0 while x < 10: list = random.sample(a,10) print(list) if list[0] % 2 != 0: print(ji, end=”,”) else: print(ou, end=”,”) if list[1] % 2 != 0: print(ji, end=”,”) else: print(ou, end=”,”) if list[2] % 2 != 0: print(ji, end=”,”) else: print(ou, end=”,”) if list[3] […]

  • Introduction and deployment of distributed storage glusterfs


    1. Overview of glusterfs Glusterfs is an extensible network file system. Compared with other distributed file systems, glusterfs has the characteristics of high scalability, high availability, high performance, and horizontal scalability. Moreover, it has no design of metadata server, so that the whole service has no hidden trouble of single point of failure.When clients access […]

  • New feature of hdfs3. X – erasure code


    Introduction to EC Erasure coding is abbreviated as EC EC (erasure code) is a kind of coding technology. Before HDFS, this coding technology is most widely used in the low-cost redundant disk array (RAID)Big data preparation knowledge – introduction of storage disk and disk redundant array raid)Raid realizes EC through striping technology, which is a […]

  • Linux operation and maintenance — 1. CEPH distributed storage architecture and working principle


    CEPH theory About CEPH CEPH is an open source project that provides a software defined, unified storage solution. CEPH is a distributed storage system with high performance, high scalability, large-scale expansion and no single point of failure. CEPH is a software defined storage solutionCEPH is a unified storage solutionCEPH is a cloud storage solutionCEPH official […]

  • Type of LVM logical volume


    There are many types of logical volumes that can be created in LVM volume groups. The following describes different types of logical volumes Linear volume Linear volumes aggregate space from one or more physical volumes into a logical volume. Physical storage is linearly connected. Creating a linear volume sequentially assigns a series of physical extents […]