Surestore 2/20 Data compression

[Richard McIndoe]

This is probable a stupid question, but how do you turn on hardware data compression? As far as I can tell, using the HP LTT, compression is not enabled on the Ultrium drives. It isn't obvious to me, but I would have figured either via the front of the library or HP LTT. Any help would be appreciated.

Rick

[Rothery Harris]

Ultrium drives compress by default. You have to specifically turn it off. This is done by the ISV application or building a device file specifically for this in UNIX. There are no hardware controls to turn it off.
The data compression in Ultrium is ALDC which stop compression if data is already compressed or very random. There is therefore little need to operate without it.

Rothery