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Hamid Ali

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Hardware RAID Question

Hi All, how are you?

I have a motherboard with megaraid 3108 Hardware RIAD (on board),
I use storcli for management it in Linux ,
anyone know how to create a RAID5 with a SSD as write  or read cache for it(RAID Group) ?

very thanks for your helps,
The Best Regards,
Avatar of Member_2_231077
Member_2_231077

Create the array, create the cachecade SSD cache, tell the array to use ssdcaching.
e.g.


storcli /c0 add vd type=raid5 size=1000gb names=myraid5 drives=0:1-5
storcli /cx add VD cc Type = raid0 drives =0:6
storcli /c0/v0 set ssdcaching=on
Avatar of Hamid Ali

ASKER

Hi Andyalder,
Thanks,
for final question, can you tell me that  the cachecade SSD cache, is it  for write cache or read cache and sequential or randoms IOs?

very thanks,
It is read and write cache,  the controller does not know if the data is sequential or random until it's been asked to read or write it so it is in effect for any data, it's just not so effective with sequential data.

The evaluation at https://www.boston.co.uk/technical/2011/11/lsi-cachecade-2-evaluation-the-benefits-of-caching.aspx is worth as read.
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