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тАО02-26-2004 12:09 AM
тАО02-26-2004 12:09 AM
Poor write performance on smartarray 3200
this time it's about the write performance of my raid 5 array...
read performance is absolutely ok, but the write throughput is never above 1,5 Mbyte/s...
there are 5 seagate hdds connected to the smartarray 3200, scsi channel 2, all are 80 pin sca drives in their bay,
The system is a quad processor pentium pro 200 MHz with 896 MB RAM
Has anyone any solution or idea for this?
TIA
Patrick
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тАО02-26-2004 02:26 AM
тАО02-26-2004 02:26 AM
Re: Poor write performance on smartarray 3200
It could be that the batteries are dead/low and the array accelerator is "disabled". During boot, do you get a 1793 or 1794 error on the screen?
If so, you can replace the accelerator board... take a look at the link below:
ftp://ftp.compaq.com/pub/supportinformation/techpubs/user_reference_guides/340862-002.pdf
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тАО02-26-2004 02:30 AM
тАО02-26-2004 02:30 AM
Re: Poor write performance on smartarray 3200
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тАО02-26-2004 03:07 AM
тАО02-26-2004 03:07 AM
Re: Poor write performance on smartarray 3200
Have a look at this link if your server is one of the listed one in the link
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=PSD_EX001122_CW01
Good Luck
Regards
Amha Kassa
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тАО02-26-2004 10:17 AM
тАО02-26-2004 10:17 AM
Re: Poor write performance on smartarray 3200
thank you for this tip but my server is not listed... it's a bull express 5800 MH server...
unfortunately they don't say why the i/o speed is decreased on these servers... that could have been of use...
i'll have to wait for another tip...
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тАО02-26-2004 04:21 PM
тАО02-26-2004 04:21 PM
Re: Poor write performance on smartarray 3200
Have a look at this document as well.
http://www.docs.hp.com/hpux/onlinedocs/225852-001/225852e1a.pdf
sks
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тАО02-26-2004 10:20 PM
тАО02-26-2004 10:20 PM
Re: Poor write performance on smartarray 3200
the ratio write/read is set to 50%... it can be increased, but with no effect...
the server acts as follows:
it receives data for example from the network... it stores it with full speed in ram until it's full. if data comes with 10MB/sec but the discs only write 1.5 MB/sec then the ram is soon full. then it continues to save the data onto the array with 1.5 MB/sec.
i can't imagine that the controller is so slow with writing into a raid 5 array...
thanks for your help... if anyone knows another solution feel free to write it here ;)
Patrick
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тАО02-28-2004 02:19 AM
тАО02-28-2004 02:19 AM
Re: Poor write performance on smartarray 3200
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тАО02-29-2004 03:45 PM
тАО02-29-2004 03:45 PM
Re: Poor write performance on smartarray 3200
However, we keep the write cache at 70% (off course it is duplexed).
Can the total cache be increased?
sks
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тАО03-01-2004 09:30 AM
тАО03-01-2004 09:30 AM
Re: Poor write performance on smartarray 3200
any idea welcome... ;)