how many disks required to initial power on VSP box.
"It depends." If the system controller (DKC) includes disk adapters (DKAs) then you need 1 RAID group (4 HDDs) plus 1 spare = 5.
If you have a "diskless" configuration (no DKAs in the controller) then you don't need any.
you mean that if no DKA's are installed, then no need the disks.
Yes, that is correct.
Just to clarify - in that configuration you would connect the disks as external storage system via CHAs using the Universal Volume Manager feature.
Are you familiar with this configuration option?
no, I am not familiar. please share if any.
So Hitachi "enterprise" class storage systems support controller-based storage virtualization. The name of the feature is "Universal Volume Manager" and it is "in the code" of the storage system, in your case, the VSP.
External storage virtualization enables you to connect other storage systems to the VSP via "SAN" connections to the channel host adapter (CHA) ports on the VSP. (There is special configuration settings for the CHA ports for this.)
When the VSP has internal disks it must have disk adapters (DKAs) in the controller (DKC) and therefore must have at least 1 RAID group + 1 spare. (Your original question, I think) When there are internal disks, you can still use the external storage virtualization feature and thus the VSP would manage both internal and external storage capacity.
In a "diskless" configuration, you have only external storage and no internal disks, thus no disk adapters (DKAs) are needed!!
So, to confirm my answer to your original question - yes, you can power-on the VSP with no disks but the system won't have any storage to manage so you won't be able to do much with it.
If you are new to VSP and Hitachi enterprise storage, I suggest you investigate our training courses: TCI2289 might be a good place for you to start. Other VSP courses include TSI2048, CCI1999, CCE1869, TSI1998. Many of our courses are offered in virtual classroom so you don't have to travel.
You can self-register in the HDS Learning Center at http://learningcenter.hds.com.
Best of luck with your VSP!
thank you for your explanation.
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Thank you Janet!
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