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Although you ve used the mount command to manually mount file systems, it s preferable to simply create an entry in /etc/vfstab to mount the file system automatically after boot. Alternatively, if you are going to make a number of entries in /etc/vfstab, and the system is not going to be rebooted for some time, then you can use the following command to mount any entries in /etc/vfstab that have not already been mounted:
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Take a look at an example entry in /etc/vfstab:
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#device device mount #to mount to fsck point /dev/dsk/c0t0d0s5 /dev/rdsk/c0t0d0s5 /usr FS fsck type pass ufs 2 mount mount at boot options yes
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This example shows an entry for the raw disk device /dev/rdsk/c0t0d0s5, mounted on /usr, standard UFS file system, mounted at boot time, with no options. In addition, the raw device on which fsck operates is /dev/rdsk/c0t0d0s5, where an fsck file system check is required. The Options field contains a comma-delimited list of mounting options, which are equivalent to those used for the mount command (see the Command Reference section, later in the chapter, for details on the mount command). In addition to UFS file systems, file systems of other types can be mounted, including special types such as swap space or NFS-mounted volumes.
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/usr/sbin/fsck is a file system checking and repair program that s commonly found on Solaris and other UNIX platforms. The program is usually executed by the superuser while the system is in a single-user mode state (for example, after you enter run-level S), but it can also be executed on individual volumes during multiuser run levels.
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There is one golden rule of which you must be aware while using fsck: never apply fsck to a mounted file system. Doing so would leave the file system in an inconsistent state and cause a kernel panic that s why running fsck on a mounted file system now causes the fsck command to abort with this message: /dev/dsk/ Is a Mounted File System, Ignored. Any fixes to potential problems on a mounted file system could end up creating more damage than the original problem. This section examines the output of fsck and some examples of common problems. It also investigates how fsck repairs corrupt and inconsistent disk data. Although Solaris 10 still retains fsck, the program is necessary only for Solaris 2.6 and previous releases with later releases, logging is provided for UNIX file systems and should always be turned on. Thus, before any changes are made to a file system, details of the change are recorded in a log prior to their physical application. While this consumes some extra CPU and disk overhead (approximately 1 percent of disk space on each volume with logging enabled is required), it does ensure that the file system is never left in an inconsistent state. In addition, boot time is reduced, because fsck does not need to be executed. Why do inconsistencies occur in the first place In theory, they shouldn t, but they can occur under three common scenarios: If the Solaris server has been switched off like an old MS-DOS machine, without being powered down first If a system is halted without synchronizing disk data (it is advisable that you explicitly use sync before shutting down using halt) If hardware defects are encountered, including damage to disk blocks and heads, which can be caused by moving the system and/or by power surges These problems are realized as corruption to the internal set of tables that every UNIX file system keeps to manage free disk blocks and inodes, which leads to blocks that are free being reported as already allocated and, conversely, to some blocks occupied by a program being recorded as free. This is obviously problematic for mission-critical data, which is a good reason to add RAID storage (or at least reliable backups). If you suspect physical damage, then you should perform surface analysis of the hard disk by using the disckscan command. The first step to running fsck is to enable file system checking during bootup. To do this, you need to specify an integer value in the fsck field in the virtual file system configuration file /etc/vfstab. Entering 1 in this field ensures sequential fsck checking, while entering 2 does not ensure sequential checking, as shown in the following example:
#device device mount FS fsck mount mount #to mount to fsck point type pass at boot options # /dev/dsk/c1t2d1s3 /dev/rdsk/c1t2d1s3 /usr ufs 2 yes -/ -
Part IV:
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