| Author |
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Stephen Eickhoff
Guest
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 Posted:
Thu Nov 11, 2004 9:26 am Post subject:
"DEC DLT2000" does not write reliably to IIIXT tapes, OK on |
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I have a Compaq 15/30 DLT which appears in the BIOS as "DEC DLT2000". The
controller is an embedded AIC 7895 (like the Adaptec 3940UW). A CD-ROM is
the only other device on the chain, which is terminated at the controller on
one end and with an active terminator on the other end with the tape drive.
The software is Veritas BE 8.6 running on Windows 2000 SP4.
This drive should, of course, support 15 GB tapes but it seems to fail (CRC
error) once 14-16 GB of data has been written to a brand new Quantum IIIXT
tape (in compressed mode). I have several III tapes in varying conditions
which all work fine with the same software - of course I need two of them to
complete the job. I backed up data to this same IIIXT tape until it was
full on a DLT8000 with no problems. Therefore, I must conclude that
something is wrong with the drive. Could it be firmware? If it is, I haven't
figured out how to get updated firmware on this drive. I took a crack at
using the Quantum 2000XT firmware but it refused to load because of the DEC
branding. Is it possible for me to change the personality of this drive and
load new firmware? Would this be foolhardy? |
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Johnson_dk
Guest
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| Posted:
Thu Nov 11, 2004 9:57 pm Post subject:
Re: "DEC DLT2000" does not write reliably to IIIXT tapes, OK |
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You can download the new firmware from here:
http://h18007.www1.hp.com/support/files/server/us/download/14912.html
You will proberly need a controller supported by compaq at the time to get
this to work, (some sort of NCR or connect the drive to an old Proliant).
Try clening the drive using a "unexpired" cleaning tape, (these are only
good for 20 cleanings)
Best regards
Johnny
"Stephen Eickhoff" <operagost@og.com> wrote in message
news:GRBkd.1069$Pu6.225@trnddc04...
| Quote: | I have a Compaq 15/30 DLT which appears in the BIOS as "DEC DLT2000". The
controller is an embedded AIC 7895 (like the Adaptec 3940UW). A CD-ROM is
the only other device on the chain, which is terminated at the controller
on
one end and with an active terminator on the other end with the tape
drive.
The software is Veritas BE 8.6 running on Windows 2000 SP4.
This drive should, of course, support 15 GB tapes but it seems to fail
(CRC
error) once 14-16 GB of data has been written to a brand new Quantum IIIXT
tape (in compressed mode). I have several III tapes in varying conditions
which all work fine with the same software - of course I need two of them
to
complete the job. I backed up data to this same IIIXT tape until it was
full on a DLT8000 with no problems. Therefore, I must conclude that
something is wrong with the drive. Could it be firmware? If it is, I
haven't
figured out how to get updated firmware on this drive. I took a crack at
using the Quantum 2000XT firmware but it refused to load because of the
DEC
branding. Is it possible for me to change the personality of this drive
and
load new firmware? Would this be foolhardy?
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Dave
Guest
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| Posted:
Fri Nov 12, 2004 10:07 pm Post subject:
Re: "DEC DLT2000" does not write reliably to IIIXT tapes, OK |
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"Stephen Eickhoff" <operagost@og.com> wrote in message
news:GRBkd.1069$Pu6.225@trnddc04...
| Quote: | This drive should, of course, support 15 GB tapes but it seems to fail
(CRC
error) once 14-16 GB of data has been written to a brand new Quantum IIIXT
tape (in compressed mode).
|
Have you tried other IIIXT tapes in this drive?
Does it/they fail at 14-16Gb every time? Seems odd that this range
corresponds to the uncompressed capacity. Try turning of HW compression and
using S/W compression instead
If it's completely reproducible that it fails at the same point every time
(14-16Gb) it's likely not the cabling but if it fails randomly definitely
check/replace your cabling.
Lastly, have you tried this drive on another machine? Maybe hook it up to a
linux/unix machine (to avoid time/hassle of installing b/u software) and
give 'er a rip.
Try all of these things, they should tell you if it's a) the tape, b) the
drive c) the s/w or machine.
I have several III tapes in varying conditions
| Quote: | which all work fine with the same software - of course I need two of them
to
complete the job. I backed up data to this same IIIXT tape until it was
full on a DLT8000 with no problems. Therefore, I must conclude that
something is wrong with the drive. Could it be firmware? If it is, I
haven't
figured out how to get updated firmware on this drive. I took a crack at
using the Quantum 2000XT firmware but it refused to load because of the
DEC
branding. Is it possible for me to change the personality of this drive
and
load new firmware? Would this be foolhardy?
|
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RPR
Guest
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| Posted:
Wed Nov 17, 2004 2:03 am Post subject:
Re: "DEC DLT2000" does not write reliably to IIIXT tapes, OK |
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You can't change the personality so you'll have to find DEC firmware,
but upgrading the code is a good idea in general.
It doesn't support the old drives officially, but I would give xTalk
(on the Quantum website) a try. It could check the error rate. Dunno if
it works with DEC code though.
If the drive fails after a similar amount of data every time its head
elevator is probably defective so it can only use the lower tracks.
Ralf-Peter |
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Mike Tomlinson
Guest
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| Posted:
Thu Dec 02, 2004 7:36 am Post subject:
Re: "DEC DLT2000" does not write reliably to IIIXT tapes, OK |
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In article <GRBkd.1069$Pu6.225@trnddc04>, Stephen Eickhoff
<operagost@og.com> writes
| Quote: | I have a Compaq 15/30 DLT which appears in the BIOS as "DEC DLT2000". The
controller is an embedded AIC 7895 (like the Adaptec 3940UW). A CD-ROM is
the only other device on the chain, which is terminated at the controller on
one end and with an active terminator on the other end with the tape drive.
The software is Veritas BE 8.6 running on Windows 2000 SP4.
This drive should, of course, support 15 GB tapes but it seems to fail (CRC
error) once 14-16 GB of data has been written to a brand new Quantum IIIXT
tape (in compressed mode).
|
Like others have said, the fact that the backup fails once you reach the
approximate uncompressed capacity of a DLTIIIXT tape (15GB) is a clue.
How are you selecting the compression? With the front panel buttons, or
in software? If in software, once you've written a IIIXT tape and taken
it out, then put it back in, what (if any) lights does the drive
illuminate to show the compression method used at the last write?
DEC used different parameters in the mode page to enable hardware
compression in the drive, so software that sends the Quantum compression
commands may not work on the DEC-firmware drives and vice versa. I've
just had this exact same problem on a DEC Unix box with two tape drives:
one a DEC TZ89 and the other a Compaq-badged Quantum DLT7000. They're
both DLT7000s, but the TZ89, having DEC firmware, needs different
commands sent to it to turn compression on.
--
..sigmonster on vacation |
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