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тАО06-21-2004 02:50 AM
тАО06-21-2004 02:50 AM
Tape Library Speed
According to the specs of Adaptec's web site, I should be getting up to 40MB per second.
Anyone have any ideas as to why my backup times are so slow? It is not a high end server (it has WD 7200rpm drives) but I feel that I should be getting much faster backup speeds.
Thanks,
Shon
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тАО06-21-2004 03:30 AM
тАО06-21-2004 03:30 AM
Re: Tape Library Speed
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тАО06-21-2004 03:54 AM
тАО06-21-2004 03:54 AM
Re: Tape Library Speed
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тАО06-21-2004 03:57 AM
тАО06-21-2004 03:57 AM
Re: Tape Library Speed
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тАО06-21-2004 04:02 AM
тАО06-21-2004 04:02 AM
Re: Tape Library Speed
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тАО06-21-2004 04:27 AM
тАО06-21-2004 04:27 AM
Re: Tape Library Speed
What cartridge are you using for your DDS3 drive? I also cannot find any record of a C1157A product number? is this a HP DDS3 product?
If it is a HP DDS3 drive then the sustained native performance is 1MB/s in DDS3 mode and 500KB/s in DDS1/2 mode.
Please do not confuse the SCSI HBA 2940 burst date rate specification with the sustained write/read performance of the tape drive. 40MB/sec is the maximum speed that your 2940 can go, and you will only see this performance during actual SCSI data transfer. The system performance will be limited by the slowest item on your bus, probably the tape drive.
Also, with a typical user file system and a typical level of fragmentation, I would not expect you to acheive any more than 5-10MB/sec from your WD 7200rpm disk drives, unless you are performing some sort of image backup and accessing the disk drive in sequential mode.
Cheers,
Dave Dewar
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тАО06-21-2004 04:29 AM
тАО06-21-2004 04:29 AM
Re: Tape Library Speed
Thanks,
Shon
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тАО06-21-2004 05:30 AM
тАО06-21-2004 05:30 AM
Re: Tape Library Speed
22MB/min? How are you measuring this? What are you using to run the tape backup?
2940 is a fast-wide card, 20MB/s. 2940UW is an ultra-wide card, 40MB/s. I don't think the 2940 came in a non-wide version. So exactly which 2940 do you have?
Bottleneck could be the reading of the disk or the writing of the tape. It's Windows. What do you do to monitor I/O throughput on a per device basis on Windows? No Glance on Windows.
Thanks,
Scott
HP Support
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тАО06-21-2004 06:39 AM
тАО06-21-2004 06:39 AM
Re: Tape Library Speed
Shon
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тАО06-21-2004 09:45 PM
тАО06-21-2004 09:45 PM
Re: Tape Library Speed
Ok, you have a DDS3 tape autoloader.
You are not going to be able to go faster than the slowest item in your SCSI IO subsystem. On specs the slowest item is your tape library.
The sustained transfer rate of the C1557A is 1MB/s using DDS3 tapes and 510KB/s using DDS1 and DDS2 tapes, if you have hardware compression enabled and have a decent compression ratio on your data, expect this to double, but that will depend on how compressible your data is.
Its possible that your WD 7200 (IDE) drives have heavy fragmentation, and/or small files and this could limit you below the tape drive levels.
We have an excellent trouble shooting guide at the following link and are Library and Tape Tools software has performance tests that allow you to verify memory to tape drive and disk to memory performance to identify bottlenecks as well as doing many other things.
Performance guide
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460&locale=en_US
LTT ( choose your OS)
Links for LTT and other performance tools at end of performance guide above
Cheers,
Dave Dewar