Re: ancient OS history, ARM is sort of channeling the IBM 360

According to Lawrence D'Oliveiro  <ldo@nz.invalid>:

How much of theoretical disk bandwidth was the filesystem capable of
using? Because I know early Unix systems were pretty terrible in that
regard, until Berkeley’s “Fast File System” came along.

My recollection is that if you were using QSAM with multiple buffers
and full track records it wasn't hard to keep the disk going at full
speed. Later versions of OS do chained scheduling if you have enough
buffers, doing several disk operations with one cnannel program.

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