Hello all
I have a question about the explanation of the performance impact of Flashcopy in an FS7200
On
https://www.ibm.com/support/knowledgecenter/sl/ST3FR7_8.3.1/com.ibm.fs7200_831.doc/svc_configbackendsefc_3xmwwx.html is stated:
To calculate the average I/O rate per volume, use the following equation:
I/O rate = (I/O capacity) / ( V + weighting factor for FlashCopy + weighting factor for volume mirroring + weighting factor for thin-provisioned)
For example, consider 20 volumes with an
I/O capacity of 5250, a FlashCopy weighting of 28,
a mirroring weighting of 5, and a thin-provisioned weighting of 0.25. The I/O rate per volume is 5250 / (20 + 28 + 5 + 2.5) = 94.6.
This estimate is an average I/O rate per volume; for example, half of the volumes might be running at 200 I/O operations per second (IOPs),
and the other half might be running at 20 IOPs. However, this rate would not overload the system because the average load is 94.6.
What do they mean in this context by
I/O Capacity 5250? How to calculate this or find out?
Thanks.
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T Masteen
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