单项选择题

A pSeries server is being used as a file server and all data is stored on a non-root volume group and resides on mounted filesystems. Which of the following commands provides the quickest way to backup all of the data and filesystem definitions？（）

A.tar
B.cpio
C.savefs
D.savevg

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单项选择题
Acompanyusesrawlogicalvolumes.Whichcommandcanbeusedtobackupthedataintherawlogicalvolumestoatape？（）

A.dd
B.tar
C.cpio
D.mksysb
单项选择题
Asystemadministratorisattemptingtorestoresomefilesfromabackuptape.Therestorefailed.Thesystemadministratorsuspectstheblocksizeofthetapedriveisincorrect.Whichofthefollowingcommandscanbeusedtodeterminetheblocksizeofthebackuptape？（）

A.dd
B.tar
C.cpio
D.restore
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