Re: [Networker] AIT-3 under Linux

In regard to: Re: [Networker] AIT-3 under Linux, Yura Pismerov said (at...:

>    Thanks, I am trying to get the density codes from the vendor.

Wow, I thought it was hard to find information on HP's web site.  Sony's
is worse.  I eventually found

        http://sony.storagesupport.com/ait/

If you pick the "SDX-700C" from the "Browse by Model" drop-down and get
the "Product Description Manual" from the documentation list, it has
the break-down of how the drive responds to various SCSI commands.

Based on the information in the "REPORT DENSITY SUPPORT" SCSI command on
page 6-85, it looks like

        AIT-3 ("mode")  = 0x32
        AIT-2 ("mode")  = 0x31
        AIT-1 ("mode")  = 0x30

As Itzik said, you need to be sure that the hardware settings (likely
dip-switches or jumpers) on the drive aren't overriding the OSes settings.

If you have an OS command (like Linux's sg_modes from the sg3_utils
package) that can report the results from the MODE SENSE command, you can
use it to determine what the defaults are.  That will probably tell you
whether jumpers/dip-switches have been set on the drive, or whether it's
being left up to the OS.

Tim

>Itzik Meirson wrote:
>
>>Code 0x00 for density means use "default" drive density.
>>You have to find if this means compress or not in the drive specs and/or
>>switches/jumpers setup.
>>Once you find from the drive documentation what is the "density" code
>>for compression you can specify this with the density=0xYZ in your
>>stinit.def under the modeX line.
>>Itzik
>>
>>
>>>    I need stinit.def entry for AIT-3 with h/w compression turned on.
>>>    All the examples I found refer to density=0x00 which I assume does
>>>not imply h/w compression, right ?
>>>    What density code should I use ? Or should I use "compression=1"
>>>instead ?
>>>
>>>    TIA.
>>>

--
Tim Mooney                              mooney AT dogbert.cc.ndsu.NoDak DOT edu
Information Technology Services         (701) 231-1076 (Voice)
Room 242-J6, IACC Building              (701) 231-8541 (Fax)
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