Re: Virtual SCSI connections, how many is too many?

Hi,

There is a difference between vSCSI connections and virtual DISKS. you can
serve up to 16 disks with one vSCSI connection, there is a long discussion
in the archives regarding disk size and even the possibility of having a
big load source and a lot of smaller drives for the data (that i think is
now moot since they lowered the LS size requirement IIRC).



On Thu, Jan 22, 2015 at 12:04 PM, e-mail s44b1443 <s44b1443@xxxxxxxxxxxx>
wrote:

Hi,


I have just taken delivery of a POWER8 which I am partitioning…disk storage
will be achieved via IBM i hosting IBM i. When I designed the system using
the SPT I configured 8 virtual SCSI connections per partition i.e. 6 for
disk, 1 for optical and 1 for tape. I read an article on here that stated,
then emphasised, then re-emphasised the point of having enough virtual disk
arms…..my question is how many is too many as there must be a disadvantage
of having too many virtual SCSI connections, possibly memory and physical
disk utilisation on the hosting partition?


Let’s say I wanted to provide a partition 100GB…I could configure this as 5
x 20GB, 10 x 10GB or 20 x 5GB, which would give the best all-round
performance to both the hosting and hosted partition?


Thanks
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