Virtual Storage Essay

287 Words2 Pages
1) Explain virtual storage on the IBM System i Virtual Storage Virtual Storage consists of objects that, when used together, imitate tape, CD, DVD and write-once read-many (WORM) media on the disk units of a System i5. The imitated media appear to the server to be actual media. When virtual storage is used, a virtual device description is created to support the virtual storage, in a similar way that an actual device description is needed to support a physical tape device. Virtual storage is of benefit for the following reasons: _ Eliminates media errors _ Eliminates user intervention _ Increases system availability _ Simplifies software and data distribution by using electronic distribution _ allows CD, DVD and tape creation using the DUPTAP or DUPOPT commands _ increases security by using Object signing for digital signatures _ simplifies creating copies by using catalog shadowing to create them Virtual Tape Virtual tape devices use virtual tape volumes that are created on a servers disk units. Virtual tape devices can perform the same tasks as a physical tape except: _ Install of base i5/OS (RSTLICPGM is supported) _ SAVSTG _ Dump to Media from SST & DST The considerations for using virtual tape storage include the: _ Correct authority to create virtual images _ Disk space requirements (smallest volume size is 48 MB. The largest is 1,000,000 MB) _ Quantity of virtual image volumes required _ Maximum block size supported by the physical tape device that the virtual tape volume will be saved to _ User profiles used to create the virtual tape volume must have their maximum storage allowed attribute set to *MAX. 2) Explain the IBM System I disk storgae capabilities

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