Fw: [aperi-dev] please review NetApp Unified Storage Appliance report in

[Simona Constantin <simona_constantin@xxxxxxxxxx>]

----- Forwarded by Simona
Constantin/Romania/Contr/IBM on 10/03/2007 08:57 PM -----

"Yoder, Alan" <agy@xxxxxxxxxx>

09/14/2007 09:36 PM

To	Simona Constantin/Romania/Contr/IBM@IBMRO
cc
Subject	RE: [aperi-dev] please review NetApp Unified Storage Appliance report in Aperi - design document

Hi Simona,

> Label logical volumes as NAS, FC, iSCSI, or unassigned 

   This is not how it works.  Logical volumes (flexvols)
can contain NAS (NFS, CIFS, HTTP, FTP, WebDAV) files, and
FC or iSCSI LUNs, in any combination.  The concept of an
"unassigned" flexvol doesn't mean anything to me.

   I notice that later in the doc this is gotten right,
with a volume able to hold all types of stuff.

> Total storage capacity used for NAS, iSCSI, FCP Blocks, snapshot,
snapshot reserve, free, and unallocated 

   You'll also need the aggregate snapshot reserve, and
the "space reserve" associated with each LUN.

> Configuration information on NetApp such as RAID and Cache
configurations 

   What is a "Cache configuration"?

> "Free Space on Aggregates" - space that has not been consumed
by the
existing FlexVols and can be used to create new FlexVols. This is the
sum of RemainingManagedSpace for all the concrete pools of a filer.

   Keep in mind that the device does thin provisioning.  You
can provision new flexvols by the bucketful on an aggregate
that has very little space left.  So the RemainingManagedSpace 
number is actually not useful for telling how much more space
you can provision.  It is only useful for telling you how much
physical capacity you have left.

> "Free Space on Volumes" - total free space on all volumes

   Because of above, this number can be much higher than the
RemainingManagedSpace on the pools.

> "Snapshot Area Space" - space occupied by snapshots in the
volumes
that resides on the aggregate

   Need to make sure we include the aggregate snapshot reserve,
if any.

   I'm unsure whether you are interested in how much space the
snapshots actually take up, or whether you want the amount of
space that's committed to them.  Normally snapshots use less
space than the snapshot reserve.  But they can grow to the point
that they start to eat into the live filesystem.  So you want
the larger of the actual used space and the reserve as a rule
for a space consumption report.

> "Volume Content: LUNs and Shares". 

   I would recommend that you include the LUN OS type in the
report.  This is not provided by SMI-S but if you are willing
to work with us we could provide a vendor extension at some
point.  The reason it's important is that some OSes (Windows
especially) lay out data on LUNs in a squirrelly way, and
knowing that Windows is going to be using the LUN lets the
filer do data layout in a way that provides much better
performance.

> glossary

   You may want to change "Netapp storage system" to "FAS
or N-series Unified Storage System", as IBM OEMs this product.
The new language is a bit awkward, but the vendor-neutrality
requirements flowing out of the OEM arrangement seem to 
mandate it.
 
Overall, looks real good.  Thanks for doing this!

Alan

> -----Original Message-----
> From: Simona Constantin [mailto:simona_constantin@xxxxxxxxxx] 
> Sent: Friday, September 14, 2007 9:07 AM
> To: Yoder, Alan
> Subject: RE: [aperi-dev] please review NetApp Unified Storage 
> Appliance report in Aperi - design document
> 
> 
> Hello Alan,
> 
> I didn't get any feedback from you.
> I would like to know what is your opinion about this.
> 
> Thank you
> ---
> Simona Constantin
> Phone: +(40)-725.164.930;
> 
> 
>                    
                     
                    
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>              "Yoder, Alan"
                     
             
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>              <agy@xxxxxxxxxx>
                     
          
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> Constantin/Romania/Contr/IBM@IBMRO  
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                   RE:
[aperi-dev] please 
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Unified Storage 
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                   report
in Aperi - 
> design document   
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> 
> Simona, did I ever get back to you on this?  Sorry,
> I remember reading through this but don't remember
> whether I sent you any feedback or not.
> 
> Alan
> 
>  From: Simona Constantin [mailto:simona_constantin@xxxxxxxxxx]
>  Sent: Wednesday, August 29, 2007 6:24 AM
>  To: aperi-dev@xxxxxxxxxxx
>  Subject: [aperi-dev] please review NetApp Unified Storage 
> Appliance report
>  in Aperi - design document
> 
> 
>  Hello all,
> 
>  Please review  the modified design document, which can
be found here:
>  
> http://wiki.eclipse.org/NetApp_Unified_Storage_Appliance_repor
> t_in_Aperi_-_design_document
> 
> 
> 
>  Thank you
>  ---
>  Simona Constantin
>  Phone: +(40)-725.164.930;
> 
>