Re: Hardware failures

[Huib Swets]

At 12:44 +1100 on 22-03-2000, Marty James wrote:

> Hi guys (and the girls to if there's any out there on this list!),
> 
> I've been experiencing frequent but non-the-less erratic Hardware 
> Failures over the last couple of months.
> 
> I run about 75 clients (all macs) off a 7300/200, to a Sony DSS tape 
> drive. I've been marking the tapes that come up with Hardware errors, 
> to see if there's a pattern. Also, I've tried disconnecting 
> EVERYTHING and letting the tape drive cool for like 8 hours. Also, 
> I've been head cleaning almost twice a week.
> 
> I can't seem to correlate my actions with any specific 
> results...sometimes one of the options above will seem to help for a 
> few days but then BOOM...Hardware Failure? Is this a buffer underrun 
> proplem or something or is the media (Tapes) the problem?
> 
> I ordered a new head cleaning tape and 10 new DSS tapes, but does 
> anyone recognize this problem and if so, what do you recommend I do?

Hi,
Can you please check the size of you storage sets?

Have a simelar problem wich drives me crazy.
Same drive I suppose(sony) DDS 3/backup machine 6100/Retrospect 4.2/MacOS 9
Used new scsi cables, termination on or off, etc, the standard scsicheck  procedure.

I am getting hardware errors just after R4.2 is UPDATING the storage set. And in al 
those 'crashed' sessions the storage set is not larger than about 4 GB.
Uncompressed there should be room on the tape for about 12GB..
I talked to Dantz. They advised me an upgrade to 4.2 (which I bought) SAME RESULTS!! 
(I compained about their advice)

So what do I do now.. dont't laugh at me. I just split the to be backed up netword 
in two. So I use two DDS tapes,
It works now as long as the siye  doesn't exceed that 4 gb barrier,
But more work for the system operator !

regards,

huib




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Re: Hardware failures

[Huib Swets]

At 12:44 +1100 on 22-03-2000, Marty James wrote:

> Hi guys (and the girls to if there's any out there on this list!),
> 
> I've been experiencing frequent but non-the-less erratic Hardware 
> Failures over the last couple of months.
> 
> I run about 75 clients (all macs) off a 7300/200, to a Sony DSS tape

> drive. I've been marking the tapes that come up with Hardware errors,

> to see if there's a pattern. Also, I've tried disconnecting 
> EVERYTHING and letting the tape drive cool for like 8 hours. Also, 
> I've been head cleaning almost twice a week.
> 
> I can't seem to correlate my actions with any specific 
> results...sometimes one of the options above will seem to help for a

> few days but then BOOM...Hardware Failure? Is this a buffer underrun

> proplem or something or is the media (Tapes) the problem?
> 
> I ordered a new head cleaning tape and 10 new DSS tapes, but does 
> anyone recognize this problem and if so, what do you recommend I do?

Hi,
Can you please check the size of you storage sets?

Have a simelar problem wich drives me crazy.
Same drive I suppose(sony) DDS 3/backup machine 6100/Retrospect 4.2/MacOS 9
Used new scsi cables, termination on or off, etc, the standard scsicheck  procedure.

I am getting hardware errors just after R4.2 is UPDATING the storage set. And in al those 'crashed' sessions the storage set is not larger than about 4 GB.
Uncompressed there should be room on the tape for about 12GB..
I talked to Dantz. They advised me an upgrade to 4.2 (which I bought) SAME RESULTS!! (I compained about their advice)

So what do I do now.. dont't laugh at me. I just split the to be backed up netword in two. So I use two DDS tapes,
It works now as long as the siye  doesn't exceed that 4 gb barrier,
But more work for the system operator !

regards,

huib



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Re: Hardware failures

[Jeffry C. Nichols]

>I ordered a new head cleaning tape and 10 new DSS tapes, but does 
>anyone recognize this problem and if so, what do you recommend I do?

I had a similar problem with my Exabyte tape drive for awhile.  The 
two things I did to help cure the problem were 1) I bought a new, 
high quality SCSI cable from Granite Digital, and 2) after I get a 
hardware (or dirty tape) error, I use the cleaning cartridge, but I 
run it through 4-5 in succession.

So far, that has worked, as I only occasionally get the errors.

Hope that helps.

Jeffry C. Nichols, PhD
Instructor/Lab Coordinator
Rice University
Biochemistry Department
Houston, Texas

Phone:  713-348-2660


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Re: Hardware failures

[jakob krabbe]

>I can't seem to correlate my actions with any specific 
>results...sometimes one of the options above will seem to help for a 
>few days but then BOOM...Hardware Failure? Is this a buffer underrun 
>proplem or something or is the media (Tapes) the problem?

If nothing else works maybe restarting the server after each back-up will
do it?

That makes my machine up and running but I have quite a diffrent setup from
yours... The problem on my side is that the back-up doesn't even start
unless that machine is restarted sort of frequentley.

Now days it works beautifully... or, using other words, it works the way
it's suppose to!

thanx,

/ jakob


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Re: Hardware failures

[David Ross]

I've learn one main thing about using Retrospect over the last ?12?
years. It will find defective hardware. Start with the SCSI cables. SCSI
termination. Move it to another machine. Or the drive may be going bad.
You didn't mention which exact model of drive you were using.

Marty James wrote:
> 
> I've been experiencing frequent but non-the-less erratic Hardware
> Failures over the last couple of months.
> 
> I run about 75 clients (all macs) off a 7300/200, to a Sony DSS tape
> drive. I've been marking the tapes that come up with Hardware errors,
> to see if there's a pattern. Also, I've tried disconnecting
> EVERYTHING and letting the tape drive cool for like 8 hours. Also,
> I've been head cleaning almost twice a week.
> 
> I can't seem to correlate my actions with any specific
> results...sometimes one of the options above will seem to help for a
> few days but then BOOM...Hardware Failure? Is this a buffer underrun
> proplem or something or is the media (Tapes) the problem?


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