Chapter 4

Performance: Magnetic Storage and Clusters

This title is a catchall for direct access magnetic media, which now includes solid-state drives (SSDs) and flash storage, in addition to just a bunch of disks (JBODs). In the old days, I/O performance was often increased by using faster disks or spreading the data across more disk actuators for concurrent access. For the record, the media used in online and other time-critical work are*

Traditional hard disks (hard disk drives [HDDs]), introduced to the world via IBM’s RAMAC

Solid-state drives (SSDs)

Solid-state flash storage

Magnetic tapes, normally now used for backup and restore

Mass storage systems, such as the old IBM 3850 MSS

CDs, optical, floppy, stick, and other devices, used ...

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