Summary

In this chapter, we have examined how to set up and manage disk volumes using the Redundant Array of Inexpensive Disks (RAID) technology. This technology is used in all production systems to ensure reliability and high availability.

Questions

1.	What is the primary striping level, allowing a single virtual file system to be constructed of multiple physical disks? 1 2 3
2.	What is the primary mirroring level, where all data written to a virtual file system is copied in real time to a separate mirroring disk? 1 2 3
3.	What is the process of spreading data across different physical disks while presenting a single logical interface for the logical volume? Backups Mirroring Striping Parity
4.	What is the level of content redundancy that retains more than one copy of a system s data across different disks? Backups Mirroring Striping Parity
5.	What is the command that creates state database replicas for virtual file systems? metastat metaclear metainit metadb
6.	What is the command that initializes metadevices? metastat metaclear metainit initmeta
7.	Which of the following is a possible cause of disk failure? Switching off a Solaris server without first powering down Halting a system without synchronizing disk data Defective hardware, including damage to disk blocks and heads All of the above
8.	Which of the following checks is not performed on inodes during fsck? A check of the file system size A check of the total number of inodes Making a tally of reported free blocks and inodes Checking that all file systems are mounted
9.	What happens if a bad block number is detected by fsck? The superblock is backed up The superblock is cleared The inode is cleared The disk needs to be reformatted at a low level
10.	Which of the following is not a valid fsck phase? Check Blocks and Sizes Check Filenames Check Pathnames Check Connectivity

Answers

1.	A. 0 is the primary striping level.
2.	B. 1 is the primary mirroring level.
3.	C. Striping is the process of spreading data across different physical disks while presenting a single logical interface for the logical volume.
4.	B. Mirroring retains more than one copy of a system s data across different disks.
5.	D. The metadb command creates state database replicas for virtual file systems.
6.	C. The command that initializes metadevices is metainit.
7.	D. Disk failures can be caused by all of the issues listed.
8.	D. No check is made during fsck to see if all file systems are mounted.
9.	C. The inode is cleared if a bad block number is detected by fsck.
10.	B. Filenames are not checked during an fsck phase.