On Mon, Jan 19, 2004 at 06:03:05PM +0100, Eugen Leitl wrote:
>
>
> -------- Original Message --------
> Subject: DDS4 DAT tape drives ( autoloaders / libraries )
> Date: Mon, 19 Jan 2004 14:28:22 +0100
> From: Eugen Leitl <el AT infochem DOT de>
> To: amanda-users AT amanda DOT org
>
> I've started looking for DDS4 DAT devices, as DDS3 seems to be tight.
>
> The local vendor has the following, amongst the others.
>
> IBM Tape 20/40GB DDS4 4mm Int. Drive - "R" ~670 EUR
> DAT HP DDS4 Trade Ready 40x6i 120-240GB int. Autoloader ~1160 EUR (this is
> a 6x tape library)
> FSC DAT Band-LW DAT DDS4 20GB 2.8MB/s for OBDR - "R" ~730 EUR
> DAT Sony SDT11000 DDS4 20-40GB int 5,25" OEM sans Software, sans Medium
> ~520 EUR
>
> Given that the 6x tape library is only 2x the price of a vanilla DDS4
> DAT drive, I'm thinking about buying it. Any (positive, negative) experience
> with the DAT HP DDS4 Trade Ready 40x6i 120-240GB int. Autoloader thingy,
> under SPARC Solaris and/or x86 Linux?
>
> If I want to use this with a Solaris box, I need
> to probe-scsi-all in OpenBoot, define device aliases and
> create according /dev entries (or are those already present
> aliased to according devices?), and run an amanda tape probe
> on according (nonrewinding, noncompressing) device alias,
> right?
>
> Am I missing something?
For their DDS2 and DDS3 changer models HP used what seems to be the
same mechanism. I think I saw an add for DDS4 magazines (to hold the
6 tapes) and it said they were compatible with the DDS3 changer.
If the mechanism is the same, it should certainly be reliable.
HP also has good docs, some supplementary that you might have to
get PDF's from their website. One in particular is how to set up
the scsi interface. They give detail for about 8 flavors of unix,
including Solaris, each with different DIP switchs for option setting.
For Solaris they also give values to enter into the st.conf file in
/kernel/drv. This is a standard editing job, but you must be very
precise in punctuation and in some places even quoted spaces.
Also, if you want your changer to appear separate from your tape drive,
you may have to unquote some higher LUN entries in st.conf. With my
DDS3 HP changer, the drive appears as Scsi ID 5, LUN 0 and teh changer
the same Scsi ID 5, but LUN 1. They are linked to /dev/rmt/0 and 1.
After that it is do a reconfigure reboot. I.e. "touch /reconfigure"
and reboot, or upon a normal reboot, interupt it and give the -r option
to the boot loader.
Most likely, without a reboot, you could get away with doing a
devfsadm command to scan the devices again and created needed /dev entries.
Alternatively, check the mailing list archives for how to use the "sgen"
driver (scsi general). This will give a different device name, more
logical, something like /dev/scsi/changer/0. I have both and they both
work for me.
If you are replacing an existing tape you already have some /dev/rmt/XXX
devices (actually symbolic links to the devices). Note even if that drive
is not hooked up, when the system sees the new drive, it will use the next
number for the /dev/rmt entries. If you want it to start over fresh from
0 again, you will have to rm /dev/rmt/* before doing the reboot or devfsadm.
BTW if the drive being offered is really a Compaq developed model, rebadged
because of the buyout of Compaq by HP, then I know nothing.
--
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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