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тАО12-04-2002 03:13 PM
тАО12-04-2002 03:13 PM
have Veritas Netbackup Datacenter Version 4.5 installed on a Windows 2000
Server and it is writing to our HP ULTRIUM LTO Tape Storage Array. We are
receiving very very poor read/write perfomance (2 to 4m/s). We are using the
Adaptec 39160/3960D-Ultra 160 SCSI adapters to connect to the tape drives.
The driver that we are using with the LTO tape drive is hplto.sys --> HP
Ultrium 1-SCSI SCSI Sequential Device version file version 1.0.1.7.
Please advise if there are any known problems/performance issues with this
combination. We need to have this resolved and I am currently working with
Veritas support as well.
Thanx
Solved! Go to Solution.
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тАО12-04-2002 10:09 PM
тАО12-04-2002 10:09 PM
Re: Poor Ultrium Performance with Veritas
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тАО12-05-2002 12:07 AM
тАО12-05-2002 12:07 AM
Solutionplease look at HP recommended HBA list http://www.hp.com/cposupport/information_storage/support_doc/lpg50063.html . Looks like 39160 should be ok.
For LTO device to work well host should provide at least 7,5MB/s for LTO215 and 15MB/s for LTO230. I would recommend you to check SCSI bus - if you use correct cabling, if you have bus terminated from both ends with correct terminators. Install HP Library and Tape Tools from http://www.hp.com/cposupport/information_storage/support_doc/lpg50128.html and check the drive, generate support ticket for it. If you wish you may attach it to your next reply
Eugeny
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тАО12-05-2002 01:15 AM
тАО12-05-2002 01:15 AM
Re: Poor Ultrium Performance with Veritas
This is necessary not a drive performance problem, it can be a disk/filesystem performance problem as well.
What kind of data do you back up (average file size) ?
Is it possible to monitor disk and cpu load when backup is running ?
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тАО12-05-2002 03:16 AM
тАО12-05-2002 03:16 AM
Re: Poor Ultrium Performance with Veritas
Eugeny
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тАО12-05-2002 07:12 AM
тАО12-05-2002 07:12 AM
Re: Poor Ultrium Performance with Veritas
Thanx for all the help
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тАО12-05-2002 05:39 PM
тАО12-05-2002 05:39 PM
Re: Poor Ultrium Performance with Veritas
Small files will slow down backups, as will sharing the tape drive SCSI bus with the disk drives being backed up.
If your disk files are highly fragmented, then this will also slow down backups.
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тАО12-06-2002 07:45 AM
тАО12-06-2002 07:45 AM
Re: Poor Ultrium Performance with Veritas
The file server is being backed up via our backup server, so the disk's are not on the same SCSI bus. Our master server is a DL-360 with 10k drives mirrored and our file server is a proliant 3000 with 10k drives RAID 5.
I am currently backing up our ghost server which has about 30GB on 25 files, so I will see how the performance works on much larger files. I will update when finished....
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тАО12-06-2002 08:24 AM
тАО12-06-2002 08:24 AM
Re: Poor Ultrium Performance with Veritas
First, I could certainly be off base here. One of the first things I check with backup performance problems is that my ip network is correctly matched. By that I mean that My interfaces, switches, etc. are at 100MB Full Duplex or matched according to support. This is one of the biggest problems problems I have seen in all backup scenarios. It might behoove you to simply verify these.
HTH,
Dave
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тАО12-16-2002 10:00 AM
тАО12-16-2002 10:00 AM