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CHAPTER 4 DATA STORAGE MANAGEMENT
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tmpfs on /dev/shm type tmpfs (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) [root@server1 ~]#
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Note: You won t be able to unmount a filesystem if it s being used. To determine where it s being used, the command lsof|grep <device name> is available for troubleshooting. If you see bash in that list, chances are good that one of your terminal sessions is actually sitting in that directory. If you find that you are, simply type cd, and press Enter. This will take you back to your home directory and release the lock on the directory.
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Now that you know our partition works as expected, we need to automate the mounting process. After all, CentOS servers aren t rebooted very often, and forgetting the list of commands you re supposed to run when it boots back up is easy to do. Apart from that, manually mounting partitions is just tedious. Fortunately, we can automated this easily by updating the /etc/fstab file which CentOS uses during booting to determine what filesystems go where: /dev/hdb1 /var/cache ext3 defaults 1 2
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The first column specifies the device, and the second column tells CentOS where to mount it. These parameters are identical to the ones we provided manually to the mount command. In this file, columns are separated by spaces, but any whitespace should work; just try to be consistent. The second column tells CentOS which filesystem it should assume is on the disk. Next comes a list of comma-separated values that control how the filesystem is set up. Generally speaking you will use defaults here, which unsurprisingly tells CentOS to use the defaults. The next two columns are more interesting. The fifth column is mostly there for historical purposes, and it determines whether or not the filesystem needs to be dumped. This information is generally used by the dump command, which is used for taking backups. However, it seems to be rare that anyone uses dump anymore; most prefer to use higher-level tools such as tar or other backup solutions. If this field is not present, it is assumed to be zero, in which case the filesystem will not be backed up by dump. The final column tells fsck (the tool that verifies and repairs filesystems) the order in which it should check filesystems during a reboot. The root filesystem should always be checked first and should have a value of 1. Other partitions can be given any number, and fsck will check them in that order. Filesystems on the same disk will be checked sequentially one after the other. If you have several disks, however, these will be checked in parallel to take full advantage of the hardware. Otherwise, if this column is set to zero or missing, fsck will presume that that particular filesystem does not need checking. To check that our new fstab file is working as expected, we can use the mount -a command to tell CentOS to mount all filesystems that it knows about that haven t already been mounted. We can then repeat the checks with df and mount to determine that the new filesystem is available.
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RAID sounds complicated, but the idea behind it is quite simple and rather cunning. By using at least two disks, we can build a system where the failure of any one of those disks won t result in lost data. Imagine that you re building a server to store all your company s crucial documents. If you have only one hard disk and that hard disk fails, you would obviously lose everything on that disk, including your extremely important documents. Now, by using RAID (level one, but we ll come back to this in a
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