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    (译)Kubernetes 存储性能对比

    如果你正在运行 Kubernetes,你可能正在使用,或者准备使用动态供给的块存储卷,而首当其冲的问题就是为集群选择合适的存储技术。这个事情并不能用一个简单的测试来做出简单的回答,告诉你目前市面上最好的技术是什么。存储技术的选择过程中,集群上运行的负载类型是一个重要的输入。对于裸金属集群来说,需要根据实际用例进行选择,并集成到自己的硬件之中。公有云中的托管 K8s,例如 AKS、EKS 或者 GKE,都具有开箱可用的块存储能力,然而这也不见得就是最好的选择。有很多因素需要考虑,比如说公有云的 StorageClass 的故障转移时间太长。例如在 一个针对 AWS EBS 的故障测试中,加载了卷的 Pod 用了超过五分钟才成功的在另一个节点上启动。Portworx 或者 OpenEBS 这样的云原生存储产品,正在尝试解决这类问题。

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    fio基础11

    rdma The RDMA I/O engine supports both RDMA memory semantics (RDMA_WRITE/RDMA_READ) and channel semantics (Send/Recv) for the InfiniBand, RoCE and iWARP protocols. falloc IO engine that does regular fallocate to simulate data transfer as fio ioengine. DDIR_READ does fallocate(,mode = keep_size,) DDIR_WRITE does fallocate(,mode = 0) DDIR_TRIM does fallocate(,mode = punch_hole) e4defrag IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate defragment activity in request to DDIR_WRITE event rbd IO engine supporting direct access to Ceph Rados Block Devices (RBD) via librbd without the need to use the kernel rbd driver. This ioengine defines engine specific options. gfapi Using Glusterfs libgfapi sync interface to direct access to Glusterfs volumes without options. gfapi_async Using Glusterfs libgfapi async interface to direct access to Glusterfs volumes without having to go through FUSE. This ioengine defines engine specific options. libhdfs Read and write through Hadoop (HDFS). The 'filename' option is used to specify host, port of the hdfs name-node to connect. This engine interprets offsets a little differently. In HDFS, files once created cannot be modified. So random writes are not possible. To imitate this, libhdfs engine expects bunch of small files to be created over HDFS, and engine will randomly pick a file out of those files based on the offset generated by fio backend. (see the example job file to create such files, use rw=write option). Please note, you might want to set necessary environment variables to work with hdfs/libhdfs properly. mtd Read, write and erase an MTD character device (e.g., /dev/mtd0). Discards are treated as erases. Depending on the underlying device type, the I/O may have to go in a certain pattern, e.g., on NAND, writing sequentially to erase blocks and discarding before overwriting. The w

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