Waisman Computing Services

New Users

This document provides basic information intended to familiarize new users with Waisman Computing Services (WCS). It is not a complete source of all the information about WCS, but merely an attempt to point you in the right direction.
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  • There are three different classes or types of storage available. The main difference between them is the resources each require. Understanding this difference will help you choose the most appropriate class of storage to meet your needs without consuming unnecessary shared resources.
    • User Storage: This storage class contains data that pertains to individuals and is not intended to be shared by others. Examples are e-mail, documents, presentations or other work product. Everyone has this class of storage and is referred to as your home directory or M drive for Windows users. It is always referenced by username. This storage has the highest level of redundancy with 100% overhead (files are duplicated in two different areas - known as mirrored or RAID-1 storage) and uses the most resources.
    • Project Storage: This storage class contains data that is shared between several users included in a "permissions list". Each user on this list has full access (read, write and delete) to all files. This storage is referred to by by a project name and can be setup and users easily added or removed from the permission list by contacting the server administrator. This storage has a lower level of redundancy than the user class but is still extremely reliable with 20% overhead (known as RAID-5) and uses less resources than user storage. Large data sets (images for example) that require backup should be on project storage rather than user storage.
    • Scratch Storage: This is just what the name implies - it is not backed up and is intended to hold large data sets that can be recovered from another source (images that are already recorded on CD for example). Unlike user or project storage, scratch storage is referenced by the name of the storage area (scratch0, scratch1, etc.) and directory (folder) name. Each scratch area can contain many directories (folders) but each directory is restricted to only those with permissions. While it has the same level of redundancy as project storage and extremely unlikely to be lost as a result of a hardware failure, it is vulnerable to accidental deletion or physical disaster that would destroy the the hardware (fire, flood, explosion, etc). Like project storage, it can also be shared among users on a permissions list. Since it's not backed up, this type of storage consumes the least resources and can be very convenient when you need to save or share a lot of data that you know can be recovered from other sources if need be.
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