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This attempts to mount all listed file systems, and reports file systems that have previously been mounted. Obviously, file systems that are currently mounted cannot be mounted twice.
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Setting Up RAID
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The first step in setting up any kind of RAID system is to install the DiskSuite packages and prepare the disks for mirroring or striping by formatting them. Primary disks and their mirrors must be set up with exactly the same partition structure to ensure that virtual file systems can be created that are compatible with both the primary and mirror. Once you have installed the DiskSuite packages, you need to prepare disks that will be used with DiskSuite. This preparation includes creating state database replicas for virtual file systems used on the system. Ideally, these state database replicas will be distributed across each controller and/or disk so that maximum redundancy can be achieved. A small partition must be created on each disk that will contain the state database (typically around 5MB). For example, to create a state database replica on the file system /dev/dsk/c1t0d0s7, you would use the following command:
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# metadb -c 3 -a -f /dev/dsk/c1t0d0s7 /dev/dsk/c0t0d0s7
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This creates three replicas on each of the two disks specified (/dev/dsk/c1t0d0s7 and /dev /dsk/c0t0d0s7). Note that two controllers are used rather than one. If no existing state database replicas can be found, the following message will be displayed:
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metadb: There are no existing databases
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To enable striping, you need to create configurations for the virtual file systems that you want to use. These can be permanently recorded in the DiskSuite configuration file (md.tab). For example, the striping configuration shown earlier in Figure 16-1 involving four 18GB disks could have its configuration recorded with the following entry, assuming the virtual file system (s5) has the path /dev/md/dsk/d5:
d5 4 1 c1t1d0s5 1 c1t2d0s5 1 c2t1d0s5 1 c2t2d0s5
Here, the four physical disks involved are /dev/dsk/c1t1d0s5, /dev/dsk/c1t2d0s5, /dev/dsk /c2t1d0s5, and /dev/dsk/c2t2d0s5. To ensure that the virtual file system is mounted at boot time, it could be included in the /etc/vfstab file, just like a normal file system. Indeed, only an entry for /dev/md/dsk/d5 should appear in /etc/vfstab after striping is complete, and the entries for /dev/dsk/c1t1d0s5, /dev/dsk/c1t2d0s5, /dev/dsk/c2t1d0s5, and /dev/dsk/c2t2d0s5 should be commented out. To initialize the d5 metadevice, use this command:
# metainit d5
If this commands succeeds, you simply treat the new metadevice as if it were a new file system and initialize a UFS on it:
# newfs /dev/md/rdsk/d5
Next, you create an appropriate mount point for the device (such as /staff) and mount the metadevice:
# mkdir /staff # mount /dev/md/dsk/d5 /staff
The striped volume d5 is now ready for use.
Mirroring
To create a mirror between two file systems, you follow a procedure similar to creating an entry in the md.tab file. For example, if you want to create a mirror of /dev/dsk/c1t1d0s5 with /dev/dsk/c0t1d0s5 (note the different controller), you would need to create a virtual
Part IV:
Managing Devices
file system (d50) that mirrored the primary file system (d52) to its mirror (d53). You would need to make the following entries in md.tab:
d50 -m /dev/md/dsk/d52 /dev/md/dsk/d53 d52 1 1 /dev/dsk/c1t1d0s5 d53 1 1 /dev/dsk/c0t1d0s5
To initialize the d5 metadevice, you would use this command:
# metainit d50 # metainit d52 # metainit d53
If this commands succeeds, you simply treat the new metadevice as if it were a new file system and initialize a UFS on it:
# newfs /dev/md/rdsk/d50 # newfs /dev/md/rdsk/d52 # newfs /dev/md/rdsk/d53
Next, you create an appropriate mount point for the device (such as /work) and mount the metadevice:
# mkdir /work # mount /dev/md/dsk/d50 /work
The mirrored volume d50 is now ready for use. It is also possible to configure RAID 5 using a similar process.
Examples
The following examples provide some real-world cases for installing disks and file systems.
Using umount
Unmounting local file systems is easy using the umount command. You simply specify the file system to be unmounted on the command line. For example, to unmount the file system mounted on /export/home, you would use the following command:
# umount /export/home
However, if there are open files on the file system, or users logging into their home directories on the target file system, it s obviously a bad idea to unmount the file system
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