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тАО01-08-2002 12:52 AM
тАО01-08-2002 12:52 AM
Slow performance on DLT8000 (8 MB/min)
The systems I've tried it on is both Win2k, SP2 using built in backupprogram. Hardware:
1. HP LC3, PII-450 MHz, 2940AU, Promise Fasttrak IDE-RAID
2. HP Vectra P4-1.7 G, 2940U2W
This is what I've done so far:
- Updated firmware on DLT to latest
- Updated firmware on Adaptec to latest
- Re-installed SP on Win2k
- Tried another (new) HP DLT-tape.
- Made sure the termination is correct
- Not using the same SCSI-ID as other devices
- Tried backing up both from SCSI & IDE-drives
- Also tried HP Omniback with same performance problems
- Made sure performance of the server is not the problem. If I do a backup "to a file" instead, I get ~120 MB/min. Backing up the same files to DLT gives me ~8 MB/min.
- Sync transfer rate on the Adaptec is set to 80 MB/min (max)
- It's almost brand new
You can really hear the DLT spinning quite strange. Like it's spinning back and forth, just like the computer can't deliver data fast enough so it has to do that but I can't see that the performance of the server is the problem here.
Any ideas?
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тАО01-08-2002 01:17 AM
тАО01-08-2002 01:17 AM
Re: Slow performance on DLT8000 (8 MB/min)
You might try to install this patch:
http://europe-support2.external.hp.com/wpsl/bin/doc.pl/screen=wpslDisplayPatch/sid=fa938d700d342be38f?PATCH_PATH=/mv_patches/intelNT/3-4.X/OMNIBACK/OMNIBACK_00031.EXE+K-Mine+0+200000058162711
See Symptom No. 20 in this link.
You also have installation instructions in this link.
Replace "europe-support2" with "us" in the above link if you log in using the American site.
HTH,
Vince
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тАО01-08-2002 01:46 AM
тАО01-08-2002 01:46 AM
Re: Slow performance on DLT8000 (8 MB/min)
It will diagnose the performance of your hardware to determine if that's causing the bad performance of your backup.
download it from:
ftp://ftp.hp.com/pub/information_storage/software/pat12.exe
Marco.
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тАО01-08-2002 04:27 AM
тАО01-08-2002 04:27 AM
Re: Slow performance on DLT8000 (8 MB/min)
Here are the results from the Performance Assesment Tool is:
SCSI-disk
Transfer rate 10,34 MB/s
DLT80 Typical transfer rate: 6 MB/s
IDE-disk
Transer rate 17,6 MB/s
DLT80 Typical transfer rate: 8 MB/s
That's quite high compared to my 8 MB/MINUTE :)
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тАО01-08-2002 05:23 AM
тАО01-08-2002 05:23 AM
Re: Slow performance on DLT8000 (8 MB/min)
Do you have the possibility to try a commercial backup application like backupexec or Arcserve?
A trial version of backupexec can de downloaded from www.veritas.com
Which compression factor are you using?
What are the other setting in the adaptec SCSI controller? (like sync negotiation, wide negotiation, enable disconnect, etc).
Since you've updated the Firmware of the DLT, you must have used Library and Tape Tools.
Have you selected device analyes? It also might tell you what's going wrong.
Marco.
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тАО01-08-2002 05:28 AM
тАО01-08-2002 05:28 AM
Re: Slow performance on DLT8000 (8 MB/min)
If your scsi disk and scsi DLT are on the same chain, then you have to make sure that they are both of the same scsi class. For example if you have a scsi-2 disk and a scsi-3 DLT, then they are interfering with each other, forcing the scsi-3 DLT to have to retransmit each data packet in a scsi-2 format. I've seen systems be crushed by having different scsi class devices on the same chain. If you have access to another scsi card, then I'd suggest doing a test by moving the DLT to it and rerunning your benchmarks.
live free or die
harry
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тАО01-08-2002 07:43 AM
тАО01-08-2002 07:43 AM
Re: Slow performance on DLT8000 (8 MB/min)
Tomorrow we'll hook it up to our Omniback installation to see if the performance gets better.
I've done some more tests that might interest you in the meantime. I hooked it up to a HP LH3 server with a Adaptec 2940UW Pro. The disks on that server is hooked up to the builtin Symbios SCSI-card so the only thing on the Adaptec is the DLT. This system is running Windows NT 4.0 SP6. I installed the DLT and downloaded the drivers from the HP web. Same problem - 6 MB/s. The PAT says 136 MB/s on that system!
Also, system nr 1 also just have the DLT hooked to the DLT. The disks are on a IDE-RAID card. But it's a 2940AU (not wide), but the performance should be pretty good anyway right?
And it makes no difference on system nr 2 if I backup from the SCSI-drives (on the same channel as DLT) or the IDE-drives.
Here are the seetings of the 2940U2W-card
Sync Transfer Rate 80 MB/s
Initiate Wide Negotiation Yes
Disable Disconnection Yes
Send Start Unit Command Yes
I tried to find which settings are correct at HP website, but couldn't find it. You know?
On the 2940UW Pro card of the LH3r the Wide Negotation was set to No.
I used Library and Tape Tools but for now I only tried Read/Write test on system nr 2. The rate is still around 6-8 MB/min when you see it testing. I aborted the test because doing the all 2000 MB would take ages.
I will post more information tomorrow like the result of the other tests in Library and Tape Tools.
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тАО01-16-2002 09:15 AM
тАО01-16-2002 09:15 AM
Re: Slow performance on DLT8000 (8 MB/min)
I've insalled HP Omniback now and the performance is still very slow. I also triedd HP Tape and Library Tools and it reports no errors.
Maybe it's time to contact HP support or do you guys have any other ideas?