Hamid Ali
asked on
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,
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,
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,
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.
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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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