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The "proutil bigrow"command performs differently between 2 different disks types

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TitleThe "proutil bigrow"command performs differently between 2 different disks types
URL NameThe-proutil-bigrow-command-performs-differently-between-2-different-disks-types
Article Number000177926
EnvironmentProduct: OpenEdge
Version: All supported versions
OS: Linux
Question/Problem Description
The "proutil bigrow"command performs differently between 2 different disks types. It takes longer on the Intel card. Is this expected?
A probkup, prorest and even dbanalys takes the same amount of time, regardless of the drive used.

 
Steps to Reproduce
Clarifying Information
Virtual machine environment. 
Error Message
Defect/Enhancement Number
Cause
Resolution
The difference between bigrow and the other tools is that bigrow is pre-allocating and re-formatting disk space specified by the command. If there is a difference in performance between disks, it is because one disk has a better I/O then the other. A test outside of Progress can be performed to eliminate Progress involvement. 

For example, if specifying 8 in the bigrow command and the BI cluster size is 16Mb, that means the BI file is being pre-formatted to (8+4) * 16Mb = 192Mb. The 4 represents the default BI clusters. On unix/linux run the dd command to simulate what bigrow does:

/usr/bin/time dd if=/dev/zero of=/tmp/test.out bs=<bi block size> count=<value> oflag=dsync

The BI block size can be acquired from the output of the command "proutil <dbname> -C describe"
For the example above, the count should be a number that multiplied by the BI block size will get a file that is 192Mb in size, for example if the BI block size is 8k then the command should be :

/usr/bin/time dd if=/dev/zero of=./test.out bs=8k count=24550 oflag=dsync
Workaround
Notes
Last Modified Date12/13/2018 5:09 PM
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