Re: What will VIOS do with disk LUNs

[Kirk Goins <kirkgoins@xxxxxxxxx>]

Update
Well it took a little digging and talking to multiple support techs at IBM..
but here's what I found out.
My config is
8202-E4B with 8 drives in the CEC and a EXP24s with 24 drives
2 drives in the CEC are Mirrored and have VIOS on them
I used VIOS to build Raid5 sets. 1 in the CEC and 3 ( 8 drives each ) in the
EXP24s

VIOS reports/sees a Raid5 set as a Single big disk ( hdisk ) so I have 4
hdisks to use for client OS's
I then made a VolumeGroup out of all 4 Raid5 sets.
I can create a LUN up to 1TB as long as the VolumeGroup has space. A LUN can
span Physical Disks and Raid sets
So all I need to manage is the total space of the VolumeGroup against the
space used by the LUNs already created.

If I was hosting guests on IBM_i, this looks like as long as I have space in
the ASP of the Hosting IBM_i
I can carve out NWSTG spaces for the guest partitions.



On Tue, Oct 25, 2011 at 8:45 PM, Kirk Goins <kirkgoins@xxxxxxxxx> wrote:

> Keep it simple, just looking for the basics. Forget over head etc to keep
> the numbers simple. VIOS owns eight 140GB drives so total space is 1120GB
> Question #1 Can a LUN span disks?
> Question #2 What VIOS cmd can I use to see how full or how much space has
> been allocated to LUNs on a physical disk?
> Question #3 If I make eight 35GB LUNs. Will VIOS place the space for each
> LUN on a different physical drive so each drive will now have 105Gb free or
> will it stack 4 LUN\s each on of 2 drives or ??
> Question #4 If I make the 35GB LUNS above and then make eight 70GB LUNs can
> a I still make two 140GB LUNs?
>
> Thanks
> --
> Kirk