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09-23-2005 08:10 AM
09-23-2005 08:10 AM
disk drive speed
it would write data to and from the drive(s) and tell you the MB/Sec it took
this was one step in a process to see if we could stream LTO2 tape drives
Does anyone know what this tools was and more importantly where i can re-download it from?
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09-23-2005 08:17 AM
09-23-2005 08:17 AM
Re: disk drive speed
Create /dev/zero.
(mknod -c ?????etc)
dd if=/dev/zero of=/mountpoint/file bs=1024k count=512
timex dd if=/mountpoint/file of=/dev/null bs=1024 count=512
512MB/seconds time=speed per second.
HTH,
Gideon
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09-23-2005 01:42 PM
09-23-2005 01:42 PM
Re: disk drive speed
dd is a fine first level approximation but is prone to false measureaments. Stuff like track-read-ahead, minimal head movement may skew the results unrealistically so.
There is a bunch of more extensive tools.
Some that come to mind: iozone, bonnie(+), iobench
Google for all of those and/or check out:
http://www.acnc.com/benchmarks.html
http://portal.acm.org/citation.cfm?id=71309
btw, Gideon's reply has a typo, leaving of a 'k' in db-1024k. Also, the large buffer size will measure throughput in MB/sec. For some applicaitons it is more important to know IO/sec and you want to repeat the same test with bs=1024 count=512000
hth,
Hein.
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09-26-2005 05:55 AM
09-26-2005 05:55 AM
Re: disk drive speed
Set up the 24-hour data collection version.
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09-27-2005 02:28 AM
09-27-2005 02:28 AM
Re: disk drive speed
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10-12-2005 12:26 AM
10-12-2005 12:26 AM
Re: disk drive speed
The tool your are searching for is probably "Pat" or "HPReadData". So have a look at this URL http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460 : there are links at the end of the page to download them and other tools.
I frequently use Pat with SAN Storage to mesure performances of different configurations. Never used HPReadData as it seems to have been designed for hpux 11.00
I you don't find it, let me know, il will send you the binary : 78 Ko zipped
Hope this will help
Eric
(PBFWME;-)
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10-12-2005 08:45 AM
10-12-2005 08:45 AM