topic Re: HP EVA best practices guide in Disk Enclosures

HP EVA best practices guide

British E — Tue, 08 Dec 2009 09:03:32 GMT

Does any one know where i can find the
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

Re: HP EVA best practices guide

gstonian — Tue, 08 Dec 2009 10:00:44 GMT

Try this:

http://www.netstar-corp.com/marketingdls/71200812295841HP%20Storage%20-%20EVA%20Best%20Practices.pdf

Regards

Re: HP EVA best practices guide

British E — Tue, 08 Dec 2009 10:17:53 GMT

Thanks for the white paper

looking through it it does not say how to calculate the occupancy alarm.

does anyone have the equation to hand???

thanks

Phil

Re: HP EVA best practices guide

gstonian — Tue, 08 Dec 2009 10:33:56 GMT

We have ours set to 90% across our EVA 5000's and EVA6000's.

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

Re: HP EVA best practices guide

Mikko Niskanen_1 — Wed, 09 Dec 2009 12:51:15 GMT

Aye, seems HP has been shifting docus around lately, I've had to hunt it down at least three times.

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