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тАО12-08-2009 01:03 AM
тАО12-08-2009 01:03 AM
HP EVA best practices guide
HP EVA best practices guide.
I have serched the web with no luck.
I need to know the definitive calculation for disk occupancy and the best pratice for disk groups.
Thanks
Phil
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тАО12-08-2009 02:00 AM
тАО12-08-2009 02:00 AM
Re: HP EVA best practices guide
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тАО12-08-2009 02:17 AM
тАО12-08-2009 02:17 AM
Re: HP EVA best practices guide
looking through it it does not say how to calculate the occupancy alarm.
does anyone have the equation to hand???
thanks
Phil
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тАО12-08-2009 02:33 AM
тАО12-08-2009 02:33 AM
Re: HP EVA best practices guide
There's an extract below taken from the linked document
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=120&prodSeriesId=321347&prodTypeId=12169&objectID=c01209515
Reducing the Impacts of Leveling: In general, to reduce the impacts of leveling, the customer should always be at the latest version of EVA firmware, set a minimum protection of "single" on all disk groups, and ensure used physical capacity is at, or below 95%. Large disk groups may tolerate an occupancy alarm that is greater than 95%. An example would be a disk group containing 100 disks. It is also important to remember that occupancy is only a warning and not a guarantee, and should be monitored closely. As this space is managed closer to its limit, monitoring the free space closely becomes more critical. Under these circumstances the impact of leveling is minimal upon the array, except in the case of a multiple disk failure or when multiple drives are removed or added simultaneously from an already existing disk group that has been written to its near full capacity. Note that in this case if there are no logical disks in the existing LDAD, there will not be any leveling. Finally, leveling is a background task and is designed to minimize impact to the customer's workload.
There is also some mention of it in here
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01800459/c01800459.pdf
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тАО12-09-2009 04:51 AM
тАО12-09-2009 04:51 AM
Re: HP EVA best practices guide
Seems that it's currently at: http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA2-0914ENW.pdf
Referring page was:
http://h18000.www1.hp.com/products/storageworks/eva8400/relatedinfo.html