Re: dasdfmt with a 1K block size - VSAM tangent

[John Ford]

On 2/18/2004 1:03 PM Jim Sibley wrote:
<snip>
When os/370 came out, it introduced a fixed block file
system (VSAM) now standardized at 4K blocks, eerily
similar to the block size of a page in memory and the
page size on disk. Also introduced were fixed block
devices that would handle both VSAM and paging nicely.
<snip2eof>

I wouldn't say that VSAM is standardized at 4K blocks.

In general:

A Control Interval can be any size from 512 to 8192 bytes in increments
of 512 bytes, and from 8 KB to 32 KB in increments of 2 KB.
The underlying physical record size is chosen by VSAM, and depends on
device geometry. The physical record size is equal to or less than the
CI size, and divides into CI size with no remainder.
--
jcf