[Info-vax] Databases versus RMS

[abrsvc]

On Thursday, April 19, 2012 8:37:52 AM UTC-4, Paul Sture wrote:
> On Wed, 18 Apr 2012 18:08:52 +0200, Dirk Munk wrote:
> 
> > Many hours, sometimes even a few days. Usually the disks are not powered
> > by the batteries, only the RAM memory of the cache.
> 
> I was given a demo of a RAM disk with real disk backup in the early 
> 1990s.  The battery in that was supposed to last long enough to copy the 
> RAM contents to the physical disk in the event of a power fail.
> 
> I never saw any of these deployed anywhere though.  I wouldn't be 
> surprised if they were too expensive.
> 
> -- 
> Paul Sture

Digital did work on SSD devices (Solid State Disk).  I recall working on the performance testing of these.  The prototype for testing simulated an RA81 disk and actually was breadboarded using the front panel of the disk.  I recall laughing at the drive's requirement to "spin up" before it was available.

Dan