On Fri, Mar 07, 2008 at 05:06:43AM -0500, Howard Martin wrote:
> It also depends on the either the st.conf settings or what Sun has built 
> into the driver. 

Yes, exactly.  When I said that it depends on the device, I really meant
the solaris device, not the hardware (although obviously that is
important as well).

> In st.conf there are 4 possible density settings coresponding to l,m,h and 
> c however they can all be set to the same value or in an order that 
> actually sets say the l device to compress. 

True.  But it appears that most devices now make use of
ST_MODE_SEL_COMP, so that compression is not set by the density setting
at all.  Instead compression and non-compression devices share the same
density setting.

> Which reminds me I must ask Sun to publish what their inbuilt drivers 
> settings actually are.

As the 'st' driver is part of the open source builds, you can find it
online:

http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/io/scsi/targets/st_conf.c

-- 
Darren Dunham                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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