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тАО05-02-2004 08:50 PM
тАО05-02-2004 08:50 PM
LTO slow backup in Tru64 unix
Hi,
We have installed LTO 460 Drives in Alpha server GS80 system . We have noticed that we are geting only 10 MB/S transfer rate. Our disk controllers are DS-KZPCC-CE Raid controller and the LTO controller is Ultra 2 KZPCA-AA Controller. Could you please provide your solution to improve the backup speed
We have installed LTO 460 Drives in Alpha server GS80 system . We have noticed that we are geting only 10 MB/S transfer rate. Our disk controllers are DS-KZPCC-CE Raid controller and the LTO controller is Ultra 2 KZPCA-AA Controller. Could you please provide your solution to improve the backup speed
2 REPLIES 2
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тАО05-04-2004 06:09 PM
тАО05-04-2004 06:09 PM
Re: LTO slow backup in Tru64 unix
What block size are you using? Increase it till 256 kb, then the througput of the Ultrium2 will increase as well.
The speed depends as well on the type of data you are writing to the tape. If it is an ordinary file system backup with a lot of small files, 50 GB/hour will be an upper limit. If it are large database files (a few GB for each file), then you will go up to 100 GB/hour (if your SCSI card isn't a bottleneck).
best regards,
Kurt
The speed depends as well on the type of data you are writing to the tape. If it is an ordinary file system backup with a lot of small files, 50 GB/hour will be an upper limit. If it are large database files (a few GB for each file), then you will go up to 100 GB/hour (if your SCSI card isn't a bottleneck).
best regards,
Kurt
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тАО05-04-2004 09:43 PM
тАО05-04-2004 09:43 PM
Re: LTO slow backup in Tru64 unix
Hi,
We provide a good performance trouble shooting guide on hp.com for tape drives. Link below:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460&locale=en_US
There is also a version of LTT for Tru64 that has some inbuilt performance tools for checking memory to tape and disk to memory transfer rate to help identify bottlenecks in the system. This tool is referenced in the performanceguide above.
Here is a link to the tru64 stuff
http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?pnameOID=238676&locale=en_US&taskId=135&prodSeriesId=238671&prodTypeId=12169&swEnvOID=1048
Cheers,
Dave Dewar
We provide a good performance trouble shooting guide on hp.com for tape drives. Link below:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460&locale=en_US
There is also a version of LTT for Tru64 that has some inbuilt performance tools for checking memory to tape and disk to memory transfer rate to help identify bottlenecks in the system. This tool is referenced in the performanceguide above.
Here is a link to the tru64 stuff
http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?pnameOID=238676&locale=en_US&taskId=135&prodSeriesId=238671&prodTypeId=12169&swEnvOID=1048
Cheers,
Dave Dewar
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