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тАО02-20-2002 08:48 AM
тАО02-20-2002 08:48 AM
Surestore E 2/20 Ultrium poor performance
Does anyone have any idea why I get such different performances on the 2 Ultrium drives. Drive 1 writes 5x slower than drive 2. Drives have already been swapped, but problem remains in the drive at position 1.
Thanks,
Ricardo Rocha
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тАО02-20-2002 01:19 PM
тАО02-20-2002 01:19 PM
Re: Surestore E 2/20 Ultrium poor performance
Can you swap the cables to each drive, and does the problem follow the drive or the cable? That would help isolate the problem to the drive (and not a software config, interface card configuration, or cabling issue). If you do swap cables, you will need to make sure the SCSI IDs are set properly.
Are the drives on the same level of firmware? There have been a number of performance improvements in recent firmware. Sometimes replacement drives do not have the latest code.
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тАО02-21-2002 01:51 AM
тАО02-21-2002 01:51 AM
Re: Surestore E 2/20 Ultrium poor performance
I assume that the 2 Ultrium drives are in a 2/20 tape library.
I think it is a firmware issue. Do the drives have the same firmware version? Check this from the control panel. From Information Menu, go to Firmware Revisions and Tape Drives.
If they do not match, upgrade the one to the same firmware level (I would assume that this is the slower drive).
HTH,
Vince
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тАО02-21-2002 02:33 AM
тАО02-21-2002 02:33 AM
Re: Surestore E 2/20 Ultrium poor performance
The firmware of bothe drives is 59V. And the controller is 1330. I think these ones are the latest.
Yes, both drives are in a 2/20 library, so only one fiber channel connects to it. We have several servers connected to it through a brocade. There is no overlap of the backups.
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тАО02-21-2002 03:02 AM
тАО02-21-2002 03:02 AM
Re: Surestore E 2/20 Ultrium poor performance
Can you give us a diagram of how the 2/20 is connected SCSI and FC wise?
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тАО02-21-2002 03:19 AM
тАО02-21-2002 03:19 AM
Re: Surestore E 2/20 Ultrium poor performance
Here it goes...
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тАО02-21-2002 03:32 AM
тАО02-21-2002 03:32 AM
Re: Surestore E 2/20 Ultrium poor performance
I really don't know what is the issue. Seems like something internal. Hope you get better answers than mine.
Vince
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тАО02-21-2002 05:23 AM
тАО02-21-2002 05:23 AM
Re: Surestore E 2/20 Ultrium poor performance
That would indicate that the problem is not specific to one drive, which would rule out firmware, etc. Cabling would be one option, but that has already been verified, and your diagram shows correct cabling.
That only leaves other factors that remain with the drive bay.
One more possibility: Is the lower performance experienced with multiple tape cartridges? And when you swapped the drives, did the tape cartridges go with the drives, or stay in position?
Reason: a problem with a particular cartridge could result in the drive having to do more retries, which slows performance. If the cartridges stayed, that could explain it.
Also, the Device Analysis section of a HP L&TT support ticket has numerous performance related values that could provide clues. Run your back/and or test that shows the performance differential. Then generate a HP L&TT support ticket (perferably while the cartridge are still loaded in the drive) and sent it to ltt_team@hp.com. You can download HP L&TT from http://www.hp.com/support/tapetools.
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тАО02-21-2002 05:27 AM
тАО02-21-2002 05:27 AM
Re: Surestore E 2/20 Ultrium poor performance
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тАО02-21-2002 08:52 AM
тАО02-21-2002 08:52 AM
Re: Surestore E 2/20 Ultrium poor performance
Both terminators are LVD/SE. They have the green led on, I suppose it means it's running on LVD mode.
The only difference in the bus structure is that drive 1 is in the same bus as the robot, while drive 2 is "alone" on its bus. It still doesn't explains such a difference in performance....