[Info-vax] Databases versus RMS

[Johnny Billquist]

On 2012-04-19 14.53, abrsvc wrote:
> 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.

DEC did SSD long before that.
Anyone remember the ML11? It's a SSD for the Massbus, looking like any 
other massbus disk (well, apart from the fact that every massbus device 
have it's own identification, so you can see what it is, and thereby 
know the capacity of the device).

	Johnny