A system administrator needs to backup datavg which contains a database that pre-allocates files by padding them with nulls, similar to treating them as sparse files. In order to effectively backup and be able to restore the datavg files, which backup method should be used?（）
- A、savevg
- B、tar
- C、cpio
- D、mksysb
正确答案:B
答案解析:有
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