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тАО08-11-2003 06:28 AM
тАО08-11-2003 06:28 AM
Intermittent slow backups on DLT-8000
For a few weeks now we noticed one of our streamers falling behind from time to time.
When backing up some boxes (20+ and 50+ GB) sometimes the throughput with Arcserve 2000 dropped from 350 MB/min to 20-30 MB/min.
Ok.. faced with this, we installed AS2k SP4 on Win2k SP4, checked firmware (HP818 library and streamer were both up to date), checked cabling, switched SCSI-drivers from MS to AHA, tried AS9 client agents, all kinds of different client-settings, debugged our switches, observed interaction with other DLT-server; nothing.
It appeared to be only the streamer causing our headaches.
I must confess (but hey, it's not my fault ;) this streamer was running with AS periodic cleaning (every 50 hours or so). It's now switched off, but out tape-failures have been increasing the last two, three months. However, during tests with LTT I noticed that the same tape on two consecutive tests performed normal _and_ slow.
One time LTT gave a couple (6) of FIFO(SDRAM) CRC errors, but since then I have not been able to get the same results. The first time LTT was used, a 'logging high error rate' was logged (950 corrected write errors, 0 on read). A few hours later I encountered 61 corrected read errors and 302 corrected write errors, 2xA400, 3xA401 and 5xA404/5 errors in the last 120 hours.
Last remark: just now the LTT Connectivity Test failed (Data miscomparison: offset 20, expected 165, found 0).
Attached is a support ticket.
Currently I'm a bit at loss, but.. could it be a defective (HVD-) cable? Or head worn out? Anyone?
Regards,
Paul
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тАО08-12-2003 04:52 AM
тАО08-12-2003 04:52 AM
Re: Intermittent slow backups on DLT-8000
My guess is a worn head. That drive should never had underwent cleaning every 50 hours... cleaning too much ruins the head. A DLT8000 drive should only be cleaned when it tells you so (solid amber cleaning LED).
HTH,
Vince
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тАО08-12-2003 09:07 AM
тАО08-12-2003 09:07 AM
Re: Intermittent slow backups on DLT-8000
DLT drives are only rated at about 100 head clean operations so if you had periodic cleaning set at 50 hours that would mean 5000 hours of life and your drive has almost 14,000 hours on it.
The errors in the drive logs are also consistent with a worn head.
The best hope for DLT drives with worn heads is to try to find tapes that still work well with the worn heads. Some tapes will fit the wear pattern better and might still work well while others will have problems.
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тАО08-14-2003 11:21 PM
тАО08-14-2003 11:21 PM
Re: Intermittent slow backups on DLT-8000
Jeffrey
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тАО08-15-2003 07:18 AM
тАО08-15-2003 07:18 AM
Re: Intermittent slow backups on DLT-8000
The support ticket however shows that the drive is running V59 firmware. Firmware revision V59 will test for that condition and will fail the drive. Usually the drive will fail the power up self test. The drive logs are full of problems that are consistent with a worn head but there are no SDRAM error entries. The logs only cover the last 500 power on hours but that should be long enough if there is a SDRAM problem.
If you get this error code again pull a support ticket immediately and post it here. I can check and see if the drive has an SDRAM failure or if the error is due to difficulty reading.