_____________________________________________________________________
Robert P. McGraw, Jr.
Manager, Computer System EMAIL: rmcgraw AT purdue DOT edu
Purdue University ROOM: MATH-807
Department of Mathematics PHONE: (765) 494-6055
150 N. University Street FAX: (419) 821-0540
West Lafayette, IN 47907-2067
> -----Original Message-----
> From: owner-amanda-users AT amanda DOT org [mailto:owner-amanda-users AT
> amanda DOT org]
> On Behalf Of Jon LaBadie
> Sent: Tuesday, August 01, 2006 6:12 PM
> To: amanda-users AT amanda DOT org
> Subject: Re: tapetype question
>
>
> On Tue, Aug 01, 2006 at 01:53:45PM -0400, McGraw, Robert P. wrote:
> > Presently I am using an SDLT220 tape drive with hardward compression
> turn
> > on. I have a new LTO2 tape drive and I really do not want to run the
> > amtapetype program if someone else has already done this.
> >
> > Here is my LTO2 drive:
> >
> > Product Type: Tape Drive
> > Vendor ID: 'HP '
> > Product ID: 'Ultrium 2-SCSI '
> > Revision: 'F63Z'
> > Attached Changer: No
> > SerialNumber: 'HUL5M02595'
> > MinBlock:1
> > MaxBlock:16777215
> > Ready: yes
> >
> ...
> >
> > I am running Solaris 10 on the amanda server. I ran the first part of
> > tapetype with /dev/rmt/1n(c) where "n" is no rewind and "c" is
> compression.
> > I did not specify the "c" or "u" for compression, yet I got "WARNING:
> Tape
> > drive has hardware compression enabled".
> >
> ...
> >
> >
> > Any ideas on how to turn off compression?
> >
>
> I'm assuming things haven't changed drastically from Sol9.
>
> Do you also have some other "1n" devices in /dev/rmt?
> For example, do you have 1ln (low), 1mn (medium), 1hn (high)?
> One of these `may' be the drive with compression turned off.
[McGraw, Robert P.]
I got a bunch. Various permuntation of 'lmhcubn". My st man page does not
give a lot of info for the LTO drive.
>
> BTW devices "c" (compressed) and "u" (ultra) are always the
> same. And the names for the letters don't really mean anything
> except convention. "l" could be high density compressed
> while "u" could be low density uncompressed. Not often set up
> that way, but who knows. They could also all be the same. The
> device without letters 1n or just 1, matches one of the lettered
> devices as the "default". But which one is controlable.
[McGraw, Robert P.]
The st man page does explain the letters but not sure that the work for the
LTO.
>
> These devices are controlled by driver settings specified
> in /kernel/drv/st.conf. During boot an id string is read from
> the device. It can be found in the massive output of prtconf,
> the '-D' option I think. That id string gets matched with one
> in st.conf. My Sol9 st.conf doesn't have an LTO entry so I
> can't demo it exactly. Sometimes you have to read the drive
> manufacturers docs to find their recommendation for the lines.
> But here is a line used by my old HP DDS3 6x24 changer.
[McGraw, Robert P.]
Per Solaris 10 /kernel/drv/st.conf
#
# The officially supported devices do not require a entry under
# tape-config-list as their configuration is built in to the driver.
#
My drive is officially supported and so no entry.
This is a good time to ask sun support. That is why I am paying for the
service.
Thanks
Robert
>
> "HP C1557A", "HP DDS-3 4mm DAT loader", "HPdds3";
>
> The first string is what is matched, spaces are important.
> The last string (HPdds3) is used to get another config entry
> later in the file. Different manufacturers may output different
> strings but use the same config entry. My config entry is:
>
> HPdds3 = 1, 0x34, 0, 0x0D639, 4, 0x00, 0x13, 0x24, 0x03, 0;
>
> I once figured out what each of the first couple of fields were,
> with various docs you can break 0xD639 to the bits turned on and
> off and their meaning to the device driver. But the last 6 fields
> are what we care about.
>
> 4 how many devices with letters will be created (4 max)
> 0x00 some code to the device and driver for the "l" device
> 0x13 ditto "m" device
> 0x24 ditto "h" device
> 0x03 ditto c" and "u" devices
> 0 which of the 4 devices matchs the default (no letter) device.
> In this case it is the "l" which is the default. I modified
> it from HP's recommended "3" (the c/u device) because I wanted
> it to be no compression.
>
>
> On the net I found a suggested entry for LTO2 - I have no idea
> if it is correct or reasonable.
>
> ULTRIUM = 1, 0x36, 0, 0xd639, 4, 0x00, 0x00, 0x00, 0x40, 3;
>
> This one creates all the 4 of the lettered devices, but note that
> l, m, and h are all the same (0x00). With this entry, the default,
> unlettered device is 3, matching the "c" and "u" devices.
>
> I'm guessing the 0x00 devices are compression off, but don't
> know that for certain.
>
> At least you have a starting point to investigate.
>
> --
> Jon H. LaBadie jon AT jgcomp DOT com
> JG Computing
> 4455 Province Line Road (609) 252-0159
> Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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