[CentOS] Shrinking a volume group
t004 at kbocek.com
Wed Sep 13 16:03:55 UTC 2006
Yep, that sucks. Now what what does bonnie++ say?
Steve Bergman wrote:
> On Wed, 2006-09-13 at 08:42 -0700, Kirk Bocek wrote:
>> Steve, show your math on how you calculated 58MB/sec from two timed processes. On an
>> array on one of my servers, I show that the time approximately doubles when running
>> two processes instead of each by themselves. That still yields about the same throughput.
> 131072*4k = 524,288k per dd process.
> There are two of these processes running simultaneously, for a total
> 1,048,576k of data.
> 1,048,576k / 1024k/M = 1024MB
> The dd's came back with wall clock times of 17.1 seconds and 18.85
> seconds. So the entire operation took a total of 18.85 seconds to read
> 1024MB of data.
> 1024MB /18.85sec = 54.3MB/sec
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