Description of problem:
Sending a CREATE command to create a disk

 
2014-02-16 03:05:39,884 - MainThread - disks - DEBUG - CREATE request content is --  url:/ovirt-engine/api/vms/97e991df-c3b0-4852-af16-4e104725558e/disks body:<disk>
    <storage_domains>
        <storage_domain href="/ovirt-engine/api/storagedomains/c5f07185-ad74-4560-acf4-82555becf7eb" id="c5f07185-ad74-4560-acf4-82555becf7eb">
            <name>DataDomainRest</name>
            <link href="/ovirt-engine/api/storagedomains/c5f07185-ad74-4560-acf4-82555becf7eb/permissions" rel="permissions"/>
            <link href="/ovirt-engine/api/storagedomains/c5f07185-ad74-4560-acf4-82555becf7eb/disks" rel="disks"/>
            <link href="/ovirt-engine/api/storagedomains/c5f07185-ad74-4560-acf4-82555becf7eb/storageconnections" rel="storageconnections"/>
            <type>data</type>
            <master>true</master>
            <storage>
                <address>10.35.148.12</address>
                <type>nfs</type>
                <path>/vol/vfilers/nfs01/jenkins-automation-rpm-vm30_nfs_2014_02_16_3_1_50_126863</path>
            </storage>
            <available>1333587345408</available>
            <used>126701535232</used>
            <committed>0</committed>
            <storage_format>v3</storage_format>
        </storage_domain>
    </storage_domains>
    <size>2147483648</size>
    <interface>ide</interface>
    <format>raw</format>
    <sparse>true</sparse>
</disk>

returns from the engine
2014-02-16 03:05:40,841 - MainThread - disks - DEBUG - Response body for CREATE request is: 
<fault>
    <reason>Operation Failed</reason>
    <detail>[Disk alias name must be formed of alpha-numeric characters or "-_."]</detail>
</fault>


in 3.3 there was no need to be specified as it was derived from the Vm name.
Like this:

2014-02-15 22:42:30,458 - MainThread - disks - DEBUG - Response code is valid: [200, 201] 
2014-02-15 22:42:30,459 - MainThread - disks - DEBUG - Response body for GET request is: 
<disks>
    <disk href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6" id="5d2db876-7079-40c0-81f6-b97133c87be6">
        <actions>
            <link href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6/move" rel="move"/>
            <link href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6/deactivate" rel="deactivate"/>
            <link href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6/activate" rel="activate"/>
            <link href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6/export" rel="export"/>
        </actions>
        <name>restvm0_Disk1</name>
        <link href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6/permissions" rel="permissions"/>
        <link href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61/disks/5d2db876-7079-40c0-81f6-b97133c87be6/statistics" rel="statistics"/>
        <vm href="/api/vms/6968a35e-81b5-4931-b093-93ee48370b61" id="6968a35e-81b5-4931-b093-93ee48370b61"/>
        <alias>restvm0_Disk1</alias>
        <image_id>25185248-0e80-42bb-9cf3-d9e51e6fccf5</image_id>
        <storage_domains>
            <storage_domain id="4f6b9fa4-275c-4866-891f-db1de0665b33"/>
        </storage_domains>
        <size>2147483648</size>
        <provisioned_size>2147483648</provisioned_size>
        <actual_size>0</actual_size>
        <status>
            <state>locked</state>
        </status>
        <interface>ide</interface>
        <format>raw</format>
        <sparse>true</sparse>
        <bootable>false</bootable>
        <shareable>false</shareable>
        <wipe_after_delete>false</wipe_after_delete>
        <propagate_errors>false</propagate_errors>
        <active>true</active>
    </disk>
</disks>