[glue-wg] Storage Sample in Glue 2.0

[Riccardo Zappi]

Hi,
I am spending some time to define an example of storage with the current 
Glue Schema draft.

Unfortunately, I have some difficulties to represents the Data Store and 
the Storage Resource as you have defined into Glue Schema.

Suppose a site with storage system organized with a SAN and cluster file 
system, like GPFS. Using the same SAN and cluster file system, I could 
define and mount different file systems upon the same infrastructure.
For example, GPFS cluster can contain up to 256 mounted file systems.

I can define some StorageShares using quota GPFS tools. In this case, 
the SS sizes are based on GPFS metadata. Therefore, I define 
StorageShare using file system feature.

I imagine one StorageResource per each file system created on GPFS.
In this case every StorageResource could have a size and quality 
properties. Some StorageShares could share the same StorageResource 
(i.e. file system) entity.

When I try to describe how StorageResource is composed some doubts 
appears. I could lists all volumes composing the file system.. For 
example in the figure attached, you can see that 16 volumes compose the 
file system named ‘gpfs_storm’. In any case, heterogeneous disk devices 
could compose each volume... and then DataStore description appears 
incorrect.

Are you sure that Storage Service administrator knows every details of 
underlying storage system? Moreover, if the admin knows, are you sure 
that he wants describe all these details?

I think we have to improve DataStore-StorageResource concepts.

Perhaps, we can go on to try to merge both concepts in only one entity 
with multi-valued quality properties.

Cheers,
Riccardo






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Riccardo Zappi

Istituto Nazionale di Fisica Nucleare - CNAF
Viale Berti Pichat, 6/2,  40127 BOLOGNA - ITALY
Phone:  +39-051-609-2868                Fax:    +39-051-609-2746
e-mail: riccardo.zappi at cnaf.infn.it
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