Hi all,

I had no time to read the document yet, but here's some comments at a first glance on these proposed changes.

On 2013-11-05 13:49, Salvatore Pinto wrote:

Hi Stephen,
yes, replacing "files" with "data object" in the text it is fine, but, in my opinion, we should also perform the following changes:

* Add to StorageEndpoint element the following attribute:

SupportedObjects

CloudStorageT_t

*

Supported data object formats (ex. Image disks, files, generic objects, etc…)

. For the use is important to know which kind of storage the service provides, if it is storage for files, disk images, EBS attached storage, etc...

It's bad design to add one more attribute for this purpose I think. The question "what kind of storage is provided" should be answered by looking at
capabilities. I think capabilities are the key thing to know "what a service does" or "what an endpoint does". Moreover, since they are open enumerations, one can use all his/her fantasy to make them mean whatever they're targeted, and it's very much extensible.

Examples:
data.management.diskimage
data.management.file
data.management.genericobject

if you don't like 'management' you can change it to some other thing, but I feel it fits...
something like 'data.supportedobject.diskimage'

* Add to StorageShare the following attributes:

MaxObjectSize	UInt64	0..1	MB	Maximum size of a data object who can be stored in this share
MinObjectSize	UInt64	0..1	MB	Minimum size of a data object who can be stored in this share

This is very important for the user (especially for EBS storage, where the storage object is a disk attached to a VM) to choose which storage service is better for their need and for the authomatic systems to perform auto-scaling of the storage.

I can see the benefit of these attributes. However, maybe the best place where to put these two attributes is StorageShareCapacity and not StorageShare.

Cheers,
Florido

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 Florido Paganelli
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Salvatore Pinto
Cloud Technologist, EGI.eu
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