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тАО01-21-2002 10:27 PM
тАО01-21-2002 10:27 PM
Ultrium Poor Performance (Win2K)
The device is connected as SCSI ID 5 on it's own channel of an Adaptec AIC-7899 SCSI controller.
The hard disks in the server consist of a RAID-1 set for OS and RAID-5 for data. All hardware RAID of course.
The problem is that no matter what device driver I use for the tape drive, the maximum tape throughput I can achieve is 2MB/sec.
I have tried both the HP v3.0 driver and the Veritas driver; both achieve near identical throughput.
Other relevant information:
* Backup Exec 8.6 device configuration is 64K block size, 1024K buffer size, 10 buffers, 7 high-water.
* SCSI controller driver is branded Adaptec with no version number (included with Win2K).
* Server is 1.266 GHz PIII (single) with 768M RAM and 280M working set. Tuned for file services and background services.
* PAT tool estimates disk throughput at 14MB/sec on the RAID-1 set .. but fails on the RAID-5 set with an error.
* For Backup Exec, the device has been configured to be exclusively available to BE.
Any further details that people want ... please post as I am monitoring this question.
Thanks in advance,
Dave.
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тАО01-21-2002 11:12 PM
тАО01-21-2002 11:12 PM
Re: Ultrium Poor Performance (Win2K)
Is your Ultriium drive daisychained to something else ?
If yes, that might be the problem. The drive needs one interface on its own.
Rgds
Alexander M. Ermes
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тАО01-22-2002 03:11 PM
тАО01-22-2002 03:11 PM
Re: Ultrium Poor Performance (Win2K)
There is an article on the IBM website regarding such performance problems. The URL is:
http://ssddom02.storage.ibm.com/tape/lto/devdriver.html
The note is right at the bottom of the page, under the heading Windows 2000.
I have therefore replaced the Adaptec drivers that were installed with the server setup CD, with the normal Microsoft drivers. The problem persists.
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тАО01-23-2002 05:07 AM
тАО01-23-2002 05:07 AM
Re: Ultrium Poor Performance (Win2K)
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тАО02-07-2002 05:29 PM
тАО02-07-2002 05:29 PM
Re: Ultrium Poor Performance (Win2K)
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тАО02-11-2002 06:41 AM
тАО02-11-2002 06:41 AM
Re: Ultrium Poor Performance (Win2K)
Sounds like something might be going on with the RAID controller on that server.
Try attaching another backup device to the server and see how the performance is.
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тАО02-11-2002 05:53 PM
тАО02-11-2002 05:53 PM
Re: Ultrium Poor Performance (Win2K)
An IBM engineer is supposed to be attending to site to update the tape firmware - I'm hopeful that this resolves the problems.
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тАО07-29-2002 07:21 AM
тАО07-29-2002 07:21 AM