RE: Using DVD-RAM drive

> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Hall, Philip
> Sent: Tuesday, February 01, 2005 2:47 PM
> To: Midrange Systems Technical Discussion
> Subject: RE: Using DVD-RAM drive
> 
> 
> Charles,
> 
> > Interesting that the compression ratio when writing to 
> > the save file is so much worse than the compression ratio 
> > when writing to the DVD-RAM> Anybody know why this is not the case?
> 
> In all seriousness this time;
> 
> SAVF's don't 'know' what media the may (or may not) end up on 
> - and as I understand it, the data compression ratio is also 
> tied in to the drive/media being used at that very point the 
> save is occurring.
> 
> All that's really happened (when doing a SAVLIB (DEV(*SAVF)) 
> is probably LZH compression on the contents of the SAVF - 
> i.e. something that is not device/media specific - but to see 
> a big compression ratio you'd need to specify where (the 
> device/media specifics) the savf will end up, I guess.

Except the DVD-RAM drive doesn't have any compression built in.  So in either 
case, it's OS/400 doing the compression when the DTACPR(*YES) is specified.


> 
> I can't get to a screen at the moment, but does the 
> SAVSAVFDTA have a DTACPR() option - or similar? Or is there 
> another way to save the savf that will allow device specific 
> compression?
> 
> --phil 
> 

SAVSAVFDTA has a COMPACT(*DEV | *NO) param.  But as mentioned above, this has 
no effect since the DVD-RAM drive doesn't offer any hardware 
compression/compaction.


Charles