Re: Guest Partition Storage Configuration

ok, how does this convey to the newer SSD??

I see maybe 2 issues with this, you end up having more items to save per-se
with more storage space objects and a longer restore window since the build
time on storage spaces is quite significant from what I have seen on a
restore of them. What about sizing, if in the end you need additional
storage for the storage space that you have defined, could it come back to
cause you issues. Example: I need to add another 150GB of space to the
current 3 spaces defined.

On Fri, Jun 24, 2011 at 10:02 AM, Jim Oberholtzer <midrangel@xxxxxxxxxx>wrote:

Each storage space is presented to the guest partition OS (regardless of
the OS) as a single DASD unit. So in the case you suggest there would
be three disk 50Gb units showing up in the OS. For Linux or WinDohs,
that's sufficient because they do not use single level storage. For IBM
i, it would not provide an I/O footprint that would allow IBM i to
optimize its I/O. Better to provide 5 units at 35Gb (175 total) than
three 50Gb units. Another small factor in setting up guest IBM i
partitions, try to mimic the same size drives as are supported by the
OS. I pick 35GB because there are more total arms, and it is a well
known size. 70Gb are fine as well, however you would only wind up with
two or three units, and that could spell trouble for the I/O performance.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 6/24/2011 8:08 AM, Jack Kingsley wrote:

Just to clarify this then, 1 storage space of 150GB would have 1 disk

arm, 3

of 50GB each would then possibly use 3?? I really didn't think about

this

aspect of creating storage spaces is why I ask.

On Fri, Jun 24, 2011 at 8:11 AM, Jim Oberholtzer<midrangel@xxxxxxxxxx
wrote:

The reason is to provide IBM i with arms to manage. Creating one
storage space would be the same as giving an IBM i instance only one
disk drive. Bad plan from an I/O performance stand point. The
architecture just works better when it's allowed to do what it is
designed to do.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 6/23/2011 3:19 PM, Jack Kingsley wrote:

> Jim, curious, I never heard of having a storage space only based

on

35GB??,

> could you elaborate on this part. If I need 150GB of space I

would just

> create 1 storage space.
>
> On Thu, Jun 23, 2011 at 4:01 PM, Evan Harris<

auctionitis@xxxxxxxxx>

wrote:

>

>> > Yes, the partition will be created with a HMC
>> >
>> > On Fri, Jun 24, 2011 at 12:04 AM, Jack Kingsley
>> > <iseriesflorida@xxxxxxxxx> wrote:

>>> > > Evan, are you creating this with an HMC or ??
>>> > >
>>> > > On Wed, Jun 22, 2011 at 6:21 PM, Evan Harris<

auctionitis@xxxxxxxxx>

>> > wrote:

>>> > >

>>>> > >> Hi Jim
>>>> > >>
>>>> > >> Thanks again for all the feedback. Your guess

about the memory

may

>>>> > >> well be correct - I know the machine in question

did not have

loads of

>>>> > >> memory at the time.
>>>> > >>
>>>> > >> --
>>>> > >> Regards
>>>> > >> Evan Harris
>>>> > >> http://www.auctionitis.co.nz

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