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Logical Volumes and the Logical Volume Manager
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Let s briefly look at the two basic methods of configuring physical disks. Although you may never have to do this yourself, it s a good idea to have a basic understanding of how disks are managed by system administrators. You can configure disks as whole disks or as logical volumes. Whole disks are exactly what their name implies: each physical disk is taken as a whole, and a single file system is created on each disk. You can neither extend nor shrink the file system at a later stage. Logical volumes, on the other hand, are created by combining several hard disks or disk partitions. System administrators usually employ the sophisticated LVM to combine physical disks. A set of physical disks is combined into a volume group, which is then sliced up by the LVM into smaller logical volumes. Most modern systems use the LVM approach because it is an extremely flexible and easy way to manage disk space. For example, it s no problem at all to add space and modify partitions on a running system by using the LVM tool. Once you create logical volumes, you can designate disk volumes as mount points, and individual files can then be created on these mount points.
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A redundant array of inexpensive (sometimes also referred to as independent) disk (RAID) device is a popular way to configure large logical (or virtual) disks from a set of smaller disks. The idea is simply to combine several small, inexpensive disks into an array in order to gain higher performance and data security. This allows you to replace one very expensive large disk with several much cheaper small disks. Data is broken up into equal-sized chunks (called the stripe size), usually 32KB or 64KB, and a chunk is written on each disk, the exact distribution of data being determined by the RAID level adopted. When the data is read back, the process is reversed, giving the appearance that one large disk, instead of several small disks, is being used. RAID devices provide you with redundancy if a disk in a RAID system fails, you can immediately and automatically reconstruct the data on the failed disk from the data on the rest of the devices. RAID systems are ubiquitous, and most Oracle databases employ them for the several performance and redundancy benefits they provide. When it comes to the performance of disk systems, two factors are of interest: the transfer rate and the number of I/O operations per second. The transfer rate refers to the efficiency with which data can move through the disk system s controller. As for I/O operations, the more a disk system can handle in a specified period, the better. Compared to traditional disks, which have an MTBF of tens of thousands of hours, disk arrays have an MTBF of millions of hours. Even when a disk in a RAID system fails, the array itself continues to operate successfully. Most modern arrays automatically start using one of the spare disks, called hot spares, to which the data from the failed drive is transferred. Most disk arrays also permit the replacement of failed disks without bringing the system itself down (this is known as hot swapping).
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The inherent trade-off in RAID systems is between performance and reliability. You can employ two fundamental techniques, striping and mirroring the disk arrays, to improve disk performance and enhance reliability. Mirroring schemes involve complete duplication of the data, and while most of the nonmirrored RAID systems also involve redundancy, it is not as high as in the mirrored systems. The redundancy in nonmirrored RAID systems is due to the fact that they store the parity information needed for reconstructing disks in case there is a malfunction in the array. The following sections describe the most commonly used RAID classifications. Except for RAID 0, all the levels offer redundancy in your disk storage system.
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