Compressed Disks

--- In [email protected], "Peter D. Ward" <pdw@m...> wrote:
 - - -
>We long ago rejected compressed DASD as unsuitable
>for our production goals.  On developer systems it
>makes more sense but there are still opportunities
>for trouble with it.

    I now keep four copies of my production system
 on one 160GB PC disk in CCKD format. ( Four weekly
 backups).  The last 160GB hard drive that I bought
 was USD150.  My small old 233Mhz and 300Mhz
 Gateway towers will hold over a TB of storage each.
 Mirror or RAID 5 would cut into that.  With RAID 5,
 I could still squeeze a TB in the little tower and
 keep about 30 copies of all of my large server disks.
 Compressed data can be read quicker than uncompressed
 data.  I/O contention can be less.

    Looking at Flex-ES, I will need ten 72GB hard
 drives to hold one copy of my data which will max
 out the Flex box.  I cannot use fast ( 15K RPM )
 disks internally and still hold all of my data.
 If I need more space for faketape or other stuff,
 external disks will be needed.  The ten hard drives
 cost over USD7000.  Having to spread the data over
 so many disks does help make up for performance
 lost by not being to use compression.

    If Flex coders cannot handle compressed disks,
 is there some SCO compression that works like
 Windows folder compression?  My preference would
 be a good, fast RVA emulation with the code to
 create snapshot images of my disks.


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