Are you using preallocate when defining the virtual volumes in Unisphere? If I recall correctly, when using preallocate, Eventhough they are not (yet) bytes written on the volume (z/OS perspective) the volume would show in Unisphere as 100% utilized.
Kind Regards, Ronald Kristel > Date: Tue, 30 Dec 2014 04:02:17 -0700 > From: [email protected] > Subject: How to relate EMC VMAX 40K storage to what is used on MF > To: [email protected] > > I was wondering if anyone has developed reports to relate the storage > (physical vs. virtual) on a VMAX 40K with what was actually being used on > the Mainframe. SAS, Excel are preferred. > > Due to the thin provisioning on the VMAX 40K I am finding it difficult to > graph what was ordered vs. what the VMAX 40K says is being used. Then > relate that to the storage I see on the Mainframe side. > > For example, say I have 100TB of storage on the VMAX 40K. I then create > TDATs, Thin pools, etc. with all of my DASD volume types. > I use ICKDSF to create the volumes and place them in various SMS pool or > setup NON SMS volumes. > > The dasd is then started to be allocated. > > On Unisphere, I show close to 100% Physical Storage used, however, the > Virtual pool says 45% used, which would leave 55% available on the VMAX > 40K. > > I then go to z/OS and see that most of my volumes have been defined and > placed where they are needed but not completely used. For example, I have > created a MOD54 and put it into use. However, the users have not created > enough datasets on that volume to fill it up. My understanding is that the > VMAX will not include that unused storage in the reports until it is used on > that Mod54. > > I also have a set with a unique name that indicates they are Spare volumes > that could be clipped and placed where needed. Those volumes total 5TB. > > I am asked by my management if I need more storage. > > So depending on the projects coming up I have 5TB of spare volumes that > could be used. But once those are used, I would need more storage. My > manager sees from Unisphere I have 55TB free from the virtual pool > allocation and wonders why I need more. > > Is there a method or process I can use that will show that even though we > have carved all the volume types fully on the VMAX 40K, because of thin > provisioning it is not all being used. At least not until every byte of > every volume is allocated with data sets. > > Do I really need to look at it from the z/OS perspective and not the VMAX > 40K side? > What is the recommendation when it comes to capacity planning for a VMAX 40K > in z/OS environments? > Any way to correlate the two worlds? > Due to the way open systems typically over provisions in the environment on > the VMAX 40K, it is difficult to know how to explain this with "management > speak" when it comes to z/OS. > > Thanks > > Lizette > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
