MSA 50 - RAID5 using Smart Array E500 Controller

[Devraj Urs]

I could not build a RAID 5 in ACU on a MSA 50 (5 X 72GB SAS). HP Tech said I need a
512MB battery backed write cache (BBWC) memory board for the ES500/256MB card. I am unsure if the part number is 383280-B21 or 378202-001.
Any clarifications on proper part number?

[IBaltay]

Hi,
the

383280-B21 is HP Smart Array Cache Battery Kit

http://h10010.www1.hp.com/wwpc/us/en/sm/WF06c/A10-51210-332469-336874-332469-434812-1827576-1827577.html?lang=en&cc=us&I1.y=0&I1.x=0&aoid=34851

378202-001
could not be found

more on MSA 50 can be found here:
http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual〈=en&cc=us&docIndexId=64179&taskId=101&prodTypeId=12169&prodSeriesId=466340

more on E500 controller can be found here:
http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?lang=en&cc=us&prodTypeId=329290&prodSeriesId=3369549〈=en&cc=us

[Devraj Urs]

Thanks.
So does 383280-B21 upgrade the ES-500 from 256MB to 512 MB, so that I can do RAID5?

[IBaltay]

here is the Configuring arrays on HP Smart array controllers reference guide:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00729544/c00729544.pdf

in which all the operations like
extending the array/migrating the RAID level or stripe size has the mandatory step of confirming that the cache is cache battery is connected and fully charged (not to loose the data in case of the power failure during the operation)
see e.g. the pages 16-17