Robert,  Given the choice between 3x233.33GB striped metas and 4x175GB striped metas, I would go with 4x175GB. Powers of two are generally best (e.g. 2,4,8,16) because they tend to be closer matches to host IO sizes, which are also typically powers of two (e.g. 4k, 8k, 16k, 32k, 64k). By having a correlation between meta member counts and host IO sizes, your workload will tend to achieve better balance across front-end device queues.  Thanks,  - Sean
Fom the documentation, we have :  Thin devices are subject to the same maximum size limit as all other Symmetrix device types. In the DMX platform the limit is 60GB and in the VMAX platform the limit is raised to 240GB. If a larger device is required, striped or concatenated thin metadevices can be formed from multiple thin devices.  Now, imagine that I need a 700 GB virtual device fromn a VMAX :  What is the best choice for the striped thin metadevices to be build ?  3 members x 233,33 GB thin devices or 4 members x 175 GB thin devices  .... and why ?  Thanks Robert
Thin Metadevices on a VMAX