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  • David Malan teaching CS75 lecture 9, Scalability

    https://youtu.be/-W9F__D3oY4

    Storage

      PATA, SATA, SAS (15,000 rpm), SSD,

      RAID0 : striping, double throughput / size, no redundancy; RAID1 : mirror; RAID2 : bit-level striping with parity, not used today; RAID3 : bit-level striping with dedicated parity drive, not used today; RAID4 : block-level striping with dedicated parity ; RAID5 : block-level striping with dedicated parity, single drive failure tolerance; RAID6 : block-level striping with double parity, two drive failure tolerance

      NAS, a file server, accessed through NFS, SMB etc.

      SAN, a virtual disk, accessed through iSCSI, Fiber Channel etc.

    Vertical scaling

    Horizontal scaling

      DNS round-robin load balancing, heavy vs. light requests

      load balancer

        Software-based LB: ELB, HAProxy, LVS etc.

        Hardware-based : F5, Cisco, Citrix etc.

      cookie/session affinity (sticky session)

        separate session server (e.g. a redis or MySQL server for hash table)

        LB inserts cookie content to remember backend-id

        this is standard approach actually nowadays, AWS ELB (Elastic Load Balancer) provides this feature as service, http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-sticky-sessions.html, for example, you can specify a cookie name which will drive the distribution of requests.

    Caching

      DNS cache

      MySQL Query Cache

      memcached

    Database Replication

      master / slave : and you can make master write-only, and slaves obviously read-only

      master / master - slave set up

    Database Partitioning

      mit.facebook.com.

      LB, cross data center, geolocation distribution

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  • 原文地址:https://www.cnblogs.com/qsort/p/5935150.html
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